{"product_id":"interest-calculator","title":"Interest Calculator","description":"\u003cstyle\u003e\n.ic-calculator {\n  --ink: #0f172a;\n  --muted: #475569;\n  --border: #e2e8f0;\n  --surface: #ffffff;\n  --tint: #f8fafc;\n  --primary: #1d4ed8;\n  --accent: #c2410c;\n  --accent-hover: #9a3412;\n  --chart-1: #1e40af;\n  --chart-2: #0d9488;\n  --chart-3: #7c3aed;\n  --chart-4: #be185d;\n  --chart-5: #334155;\n  color: var(--ink);\n  background: var(--surface);\n  border: 1px solid var(--border);\n  border-radius: 8px;\n  box-shadow: 0 1px 2px rgba(15,23,42,.06);\n  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, \"Segoe UI\", sans-serif;\n  font-size: 15px;\n  line-height: 1.55;\n  max-width: 1200px;\n  margin: 0 auto;\n  overflow-wrap: anywhere;\n}\n.ic-calculator,\n.ic-calculator *,\n.ic-calculator *::before,\n.ic-calculator *::after { box-sizing: border-box; }\n.ic-calculator * { min-width: 0; }\n.ic-calculator h2,\n.ic-calculator h3,\n.ic-calculator p { margin-top: 0; }\n.ic-calculator h2 { font-size: 24px; line-height: 1.25; font-weight: 700; margin-bottom: 8px; }\n.ic-calculator h3 { font-size: 18px; line-height: 1.35; font-weight: 650; margin-bottom: 12px; }\n.ic-calculator a { color: var(--primary); text-underline-offset: 2px; }\n.ic-calculator a:hover { text-decoration-thickness: 2px; }\n.ic-calculator button,\n.ic-calculator input,\n.ic-calculator select { font: inherit; }\n.ic-calculator button,\n.ic-calculator input,\n.ic-calculator select { min-height: 44px; }\n.ic-calculator button { cursor: pointer; }\n.ic-calculator :focus-visible { outline: 3px solid rgba(29,78,216,.35); outline-offset: 2px; }\n.ic-header { padding: 24px 24px 16px; border-bottom: 1px solid var(--border); background: var(--tint); border-radius: 8px 8px 0 0; }\n.ic-subtitle { color: var(--muted); margin-bottom: 16px; max-width: 780px; }\n.ic-pills { display: flex; flex-wrap: wrap; gap: 8px; }\n.ic-pill { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); color: var(--muted); font-size: 13px; font-weight: 500; font-variant-numeric: tabular-nums; }\n.ic-pill strong { color: var(--ink); font-weight: 700; }\n.ic-toolbar { display: flex; flex-wrap: wrap; gap: 12px; padding: 16px 24px; border-bottom: 1px solid var(--border); align-items: center; }\n.ic-btn { border: 1px solid var(--border); border-radius: 6px; padding: 11px 18px; font-weight: 650; background: var(--surface); color: var(--ink); display: inline-flex; align-items: center; justify-content: center; gap: 10px; line-height: 1.2; white-space: nowrap; box-shadow: 0 1px 2px rgba(15,23,42,.06); }\n.ic-btn:hover { border-color: #cbd5e1; box-shadow: 0 2px 5px rgba(15,23,42,.10); }\n.ic-btn-excel { background: var(--accent); border-color: var(--accent); color: #ffffff; }\n.ic-btn-excel:hover { background: var(--accent-hover); border-color: var(--accent-hover); }\n.ic-btn-icon { width: 18px; height: 18px; display: inline-flex; align-items: center; justify-content: center; font-size: 18px; line-height: 1; }\n.ic-workspace { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; padding: 24px; }\n.ic-panel { border: 1px solid var(--border); border-radius: 8px; background: var(--surface); box-shadow: 0 1px 2px rgba(15,23,42,.04); padding: 20px; }\n.ic-panel-title { display: flex; align-items: baseline; justify-content: flex-start; gap: 8px; margin-bottom: 16px; }\n.ic-panel-title span { color: var(--muted); font-size: 13px; font-weight: 500; }\n.ic-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; align-items: start; }\n.ic-field { display: flex; flex-direction: column; gap: 6px; }\n.ic-field-wide { grid-column: 1 \/ -1; }\n.ic-field label,\n.ic-fieldset legend { font-size: 14px; line-height: 1.35; font-weight: 600; color: var(--ink); }\n.ic-help { color: var(--muted); font-size: 13px; font-weight: 500; line-height: 1.4; min-height: 36px; }\n.ic-control { width: 100%; border: 1px solid #cbd5e1; border-radius: 6px; background: #ffffff; color: var(--ink); padding: 10px 12px; font-variant-numeric: tabular-nums; }\n.ic-control:hover { border-color: #94a3b8; }\n.ic-control[aria-invalid=\"true\"] { border-color: #b91c1c; box-shadow: 0 0 0 1px #b91c1c; }\n.ic-error { color: #991b1b; font-size: 13px; font-weight: 600; min-height: 20px; }\n.ic-fieldset { grid-column: 1 \/ -1; border: 0; padding: 0; margin: 0; }\n.ic-fieldset legend { margin-bottom: 8px; }\n.ic-segments { display: inline-flex; flex-wrap: wrap; gap: 8px; }\n.ic-segment-label { position: relative; display: inline-flex; }\n.ic-segment-input { position: absolute; opacity: 0; pointer-events: none; }\n.ic-segment-text { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 8px 14px; border: 1px solid #cbd5e1; border-radius: 6px; background: #ffffff; color: var(--ink); font-size: 14px; font-weight: 650; cursor: pointer; }\n.ic-segment-input:checked + .ic-segment-text { border-color: var(--primary); background: #eff6ff; color: #1e3a8a; box-shadow: inset 0 0 0 1px var(--primary); }\n.ic-segment-input:focus-visible + .ic-segment-text { outline: 3px solid rgba(29,78,216,.35); outline-offset: 2px; }\n.ic-results-main { padding: 16px; border: 1px solid #bfdbfe; border-radius: 8px; background: #eff6ff; margin-bottom: 16px; }\n.ic-results-main-label { font-size: 13px; font-weight: 650; color: #1e3a8a; margin-bottom: 4px; }\n.ic-results-main-value { font-size: 30px; line-height: 1.2; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ink); }\n.ic-results-main-note { color: var(--muted); font-size: 13px; font-weight: 500; margin-top: 6px; }\n.ic-result-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }\n.ic-result-card { border: 1px solid var(--border); border-radius: 6px; padding: 12px; background: var(--tint); }\n.ic-result-label { color: var(--muted); font-size: 13px; font-weight: 600; line-height: 1.35; margin-bottom: 4px; }\n.ic-result-value { font-size: 20px; line-height: 1.3; font-weight: 700; font-variant-numeric: tabular-nums; }\n.ic-result-value-small { font-size: 16px; }\n.ic-live { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }\n.ic-section { padding: 0 24px 24px; }\n.ic-section-card { border: 1px solid var(--border); border-radius: 8px; background: var(--surface); padding: 20px; box-shadow: 0 1px 2px rgba(15,23,42,.04); }\n.ic-section-head { margin-bottom: 16px; }\n.ic-section-head p { color: var(--muted); margin-bottom: 0; }\n.ic-breakdown-cluster { display: grid; grid-template-columns: minmax(220px, 320px) minmax(260px, 420px); justify-content: center; align-items: center; gap: 24px; }\n.ic-donut-wrap { display: flex; justify-content: center; align-items: center; }\n.ic-donut { width: min(100%, 320px); height: auto; display: block; overflow: visible; }\n.ic-donut-bg { fill: none; stroke: #e2e8f0; stroke-width: 26; }\n.ic-donut-segment { fill: none; stroke-width: 26; stroke-linecap: butt; transform: rotate(-90deg); transform-origin: 80px 80px; }\n.ic-donut-center-label { font-size: 10px; font-weight: 600; fill: var(--muted); text-anchor: middle; }\n.ic-donut-center-value { font-size: 14px; font-weight: 700; fill: var(--ink); text-anchor: middle; font-variant-numeric: tabular-nums; }\n.ic-legend { display: grid; gap: 10px; align-content: start; }\n.ic-legend-row { display: grid; grid-template-columns: 12px minmax(0, max-content) max-content max-content; align-items: center; column-gap: 10px; row-gap: 4px; font-size: 13px; font-weight: 500; }\n.ic-swatch { width: 12px; height: 12px; border-radius: 3px; }\n.ic-legend-name { color: var(--ink); font-weight: 650; }\n.ic-legend-value,\n.ic-legend-percent { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }\n.ic-chart-callout { margin-top: 16px; border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; background: var(--tint); color: var(--muted); font-size: 13px; font-weight: 500; }\n.ic-chart-card { display: grid; gap: 16px; }\n.ic-chart-plot { width: min(100%, 900px); margin: 0 auto; }\n.ic-chart-svg { display: block; width: 100%; height: auto; overflow: visible; }\n.ic-gridline { stroke: #e2e8f0; stroke-width: 1; }\n.ic-axis-label { fill: var(--muted); font-size: 13px; font-weight: 500; }\n.ic-series-line { fill: none; stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; }\n.ic-series-area { opacity: .10; }\n.ic-series-dot { stroke: #ffffff; stroke-width: 2; }\n.ic-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 18px; margin-top: 16px; }\n.ic-chart-legend-item { display: inline-grid; grid-template-columns: 12px max-content; align-items: center; gap: 8px; font-size: 13px; font-weight: 650; color: var(--ink); }\n.ic-series-summary { display: grid; grid-template-columns: repeat(3, minmax(0, max-content)); justify-content: center; gap: 10px 24px; font-size: 13px; font-weight: 500; }\n.ic-series-summary-row { display: grid; gap: 2px; }\n.ic-series-summary-row strong { font-variant-numeric: tabular-nums; }\n.ic-empty { border: 1px dashed #cbd5e1; border-radius: 6px; padding: 16px; background: var(--tint); color: var(--muted); text-align: center; font-size: 13px; font-weight: 600; }\n.ic-safe-stack .ic-breakdown-cluster { grid-template-columns: 1fr; justify-items: center; }\n.ic-safe-stack .ic-legend { width: min(100%, 420px); }\n.ic-safe-stack .ic-chart-callout { margin-top: 20px; }\n.ic-table-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }\n.ic-table-overflow { overflow-x: auto; border: 1px solid var(--border); border-radius: 6px; }\n.ic-table { width: 100%; border-collapse: collapse; min-width: 650px; font-variant-numeric: tabular-nums; }\n.ic-table th,\n.ic-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: right; white-space: nowrap; }\n.ic-table th:first-child,\n.ic-table td:first-child { text-align: left; }\n.ic-table thead th { background: var(--ink); color: #ffffff; font-size: 13px; font-weight: 700; }\n.ic-table tbody tr:nth-child(even) { background: var(--tint); }\n.ic-table tbody tr:last-child td { border-bottom: 0; }\n.ic-table-note { margin-top: 16px; border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; background: var(--tint); color: var(--muted); font-size: 13px; font-weight: 500; }\n.ic-safe-table-stack .ic-table-note { margin-top: 20px; }\n.ic-education { padding: 24px; border-top: 1px solid var(--border); background: var(--tint); border-radius: 0 0 8px 8px; }\n.ic-education-inner { max-width: 900px; margin: 0 auto; }\n.ic-education h2 { margin-top: 28px; }\n.ic-education h2:first-child { margin-top: 0; }\n.ic-education h3 { margin-top: 22px; }\n.ic-education p { color: #334155; margin-bottom: 12px; }\n.ic-education ul { margin: 0 0 16px; padding-left: 22px; }\n.ic-education li { margin-bottom: 8px; color: #334155; }\n.ic-formula { border-left: 4px solid var(--primary); padding: 12px 16px; background: #ffffff; border-radius: 0 6px 6px 0; font-variant-numeric: tabular-nums; }\n@container (min-width: 900px) {\n  .ic-workspace { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }\n}\n@container (max-width: 639px) {\n  .ic-breakdown-cluster { grid-template-columns: 1fr; justify-items: center; }\n  .ic-legend { width: 100%; }\n  .ic-legend-row { grid-template-columns: 12px max-content max-content; justify-content: start; }\n  .ic-legend-percent { grid-column: 2 \/ -1; padding-left: 0; }\n  .ic-series-summary { grid-template-columns: 1fr; justify-content: stretch; }\n}\n@media (min-width: 900px) {\n  .ic-calculator { container-type: inline-size; }\n}\n@media (max-width: 899px) {\n  .ic-calculator { container-type: inline-size; }\n}\n@media (max-width: 639px) {\n  .ic-header,\n  .ic-toolbar,\n  .ic-workspace,\n  .ic-section,\n  .ic-education { padding-left: 16px; padding-right: 16px; }\n  .ic-workspace { padding-top: 16px; padding-bottom: 16px; }\n  .ic-fields { grid-template-columns: 1fr; }\n  .ic-field-wide { grid-column: auto; }\n  .ic-result-grid { grid-template-columns: 1fr; }\n  .ic-panel,\n  .ic-section-card { padding: 16px; }\n  .ic-btn { flex: 1 1 auto; }\n  .ic-btn-excel { flex: 1 1 100%; }\n  .ic-results-main-value { font-size: 26px; }\n  .ic-chart-callout,\n  .ic-table-note { margin-top: 12px; }\n}\n\u003c\/style\u003e\n\u003cdiv class=\"ic-calculator\" data-calculator-root\u003e\n  \u003csection class=\"ic-header\"\u003e\n    \u003ch2\u003eCompound Interest Calculator\u003c\/h2\u003e\n    \u003cp class=\"ic-subtitle\"\u003eProject how an initial balance and recurring contributions may grow, including compounding frequency, taxes on interest, and inflation-adjusted buying power.\u003c\/p\u003e\n    \u003cdiv class=\"ic-pills\" aria-label=\"Live calculation highlights\"\u003e\n      \u003cspan class=\"ic-pill\"\u003eNet APY \u003cstrong class=\"ic-pill-apy\"\u003e5.00%\u003c\/strong\u003e\u003c\/span\u003e\n      \u003cspan class=\"ic-pill\"\u003eHorizon \u003cstrong class=\"ic-pill-horizon\"\u003e5 years\u003c\/strong\u003e\u003c\/span\u003e\n      \u003cspan class=\"ic-pill\"\u003eContributions \u003cstrong class=\"ic-pill-contrib\"\u003e$25,000.00\u003c\/strong\u003e\u003c\/span\u003e\n      \u003cspan class=\"ic-pill\"\u003eReal balance \u003cstrong class=\"ic-pill-real\"\u003e$47,042.54\u003c\/strong\u003e\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003cdiv class=\"ic-toolbar\" aria-label=\"Calculator actions\"\u003e\n    \u003cbutton class=\"ic-btn ic-btn-excel\" type=\"button\" data-ic-action=\"excel\"\u003e\u003cspan class=\"ic-btn-icon\" aria-hidden=\"true\"\u003e↓\u003c\/span\u003e\u003cspan\u003eDownload Excel\u003c\/span\u003e\u003c\/button\u003e\n    \u003cbutton class=\"ic-btn\" type=\"button\" data-ic-action=\"reset\"\u003e\u003cspan class=\"ic-btn-icon\" aria-hidden=\"true\"\u003e↺\u003c\/span\u003e\u003cspan\u003eReset\u003c\/span\u003e\u003c\/button\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"ic-workspace\"\u003e\n    \u003csection class=\"ic-panel\" aria-labelledby=\"ic-inputs-title\"\u003e\n      \u003cdiv class=\"ic-panel-title\"\u003e\n\u003ch3 id=\"ic-inputs-title\"\u003eInputs\u003c\/h3\u003e\n\u003cspan\u003eUpdates live\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"ic-fields\"\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-initial\"\u003eInitial investment\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-money\" id=\"ic-initial\" type=\"text\" inputmode=\"decimal\" value=\"$20,000.00\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eAmount invested before the first month.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-initial-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-annual\"\u003eAnnual contribution\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-money\" id=\"ic-annual\" type=\"text\" inputmode=\"decimal\" value=\"$5,000.00\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eAdded once per year at the selected timing.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-annual-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-monthly\"\u003eMonthly contribution\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-money\" id=\"ic-monthly\" type=\"text\" inputmode=\"decimal\" value=\"$0.00\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eAdded every month in addition to annual deposits.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-monthly-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-rate\"\u003eAnnual interest rate\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-percent\" id=\"ic-rate\" type=\"text\" inputmode=\"decimal\" value=\"5.00%\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eNominal annual rate before tax.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-rate-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-compound\"\u003eCompounding frequency\u003c\/label\u003e\n          \u003cselect class=\"ic-control\" id=\"ic-compound\"\u003e\n            \u003coption value=\"1\" selected\u003eAnnually\u003c\/option\u003e\n            \u003coption value=\"2\"\u003eSemiannually\u003c\/option\u003e\n            \u003coption value=\"4\"\u003eQuarterly\u003c\/option\u003e\n            \u003coption value=\"12\"\u003eMonthly\u003c\/option\u003e\n            \u003coption value=\"24\"\u003eSemimonthly\u003c\/option\u003e\n            \u003coption value=\"26\"\u003eBiweekly\u003c\/option\u003e\n            \u003coption value=\"52\"\u003eWeekly\u003c\/option\u003e\n            \u003coption value=\"365\"\u003eDaily\u003c\/option\u003e\n            \u003coption value=\"continuous\"\u003eContinuously\u003c\/option\u003e\n          \u003c\/select\u003e\n          \u003cdiv class=\"ic-help\"\u003eHow often the nominal rate is credited.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-compound-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-years\"\u003eInvestment length, years\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-number\" id=\"ic-years\" type=\"text\" inputmode=\"numeric\" value=\"5\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eWhole years from 0 to 100.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-years-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-months\"\u003eAdditional months\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-number\" id=\"ic-months\" type=\"text\" inputmode=\"numeric\" value=\"0\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eExtra months from 0 to 11.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-months-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-tax\"\u003eTax rate on interest\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-percent\" id=\"ic-tax\" type=\"text\" inputmode=\"decimal\" value=\"0.00%\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eApplied to interest as it is credited.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-tax-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"ic-field\"\u003e\n          \u003clabel for=\"ic-inflation\"\u003eAnnual inflation rate\u003c\/label\u003e\n          \u003cinput class=\"ic-control ic-percent\" id=\"ic-inflation\" type=\"text\" inputmode=\"decimal\" value=\"3.00%\" autocomplete=\"off\"\u003e\n          \u003cdiv class=\"ic-help\"\u003eUsed only for today-dollar buying power.\u003c\/div\u003e\n          \u003cdiv class=\"ic-error\" id=\"ic-inflation-error\" aria-live=\"polite\"\u003e\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cfieldset class=\"ic-fieldset\"\u003e\n          \u003clegend\u003eContribution timing\u003c\/legend\u003e\n          \u003cdiv class=\"ic-segments\"\u003e\n            \u003clabel class=\"ic-segment-label\"\u003e\u003cinput class=\"ic-segment-input\" id=\"ic-timing-begin\" type=\"radio\" name=\"ic-timing\" value=\"beginning\" checked\u003e\u003cspan class=\"ic-segment-text\"\u003eBeginning of period\u003c\/span\u003e\u003c\/label\u003e\n            \u003clabel class=\"ic-segment-label\"\u003e\u003cinput class=\"ic-segment-input\" id=\"ic-timing-end\" type=\"radio\" name=\"ic-timing\" value=\"end\"\u003e\u003cspan class=\"ic-segment-text\"\u003eEnd of period\u003c\/span\u003e\u003c\/label\u003e\n          \u003c\/div\u003e\n          \u003cdiv class=\"ic-help\"\u003eBeginning deposits receive one additional period of growth.\u003c\/div\u003e\n        \u003c\/fieldset\u003e\n      \u003c\/div\u003e\n    \u003c\/section\u003e\n\n    \u003csection class=\"ic-panel\" aria-labelledby=\"ic-results-title\"\u003e\n      \u003cdiv class=\"ic-panel-title\"\u003e\n\u003ch3 id=\"ic-results-title\"\u003eResults\u003c\/h3\u003e\n\u003cspan\u003eAfter estimated tax\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"ic-results-main\"\u003e\n        \u003cdiv class=\"ic-results-main-label\"\u003eEnding balance\u003c\/div\u003e\n        \u003cdiv class=\"ic-results-main-value\" data-ic-result=\"ending\"\u003e$54,535.20\u003c\/div\u003e\n        \u003cdiv class=\"ic-results-main-note\" data-ic-result=\"ending-note\"\u003eAfter 5 years at a 5.00% net annual yield.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ic-result-grid\"\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eTotal principal\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value\" data-ic-result=\"principal\"\u003e$45,000.00\u003c\/div\u003e\n\u003c\/div\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eTotal contributions\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value\" data-ic-result=\"contributions\"\u003e$25,000.00\u003c\/div\u003e\n\u003c\/div\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eTotal interest\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value\" data-ic-result=\"interest\"\u003e$9,535.20\u003c\/div\u003e\n\u003c\/div\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eInflation-adjusted balance\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value\" data-ic-result=\"real\"\u003e$47,042.54\u003c\/div\u003e\n\u003c\/div\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eInterest on initial investment\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value ic-result-value-small\" data-ic-result=\"initial-interest\"\u003e$5,525.63\u003c\/div\u003e\n\u003c\/div\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eInterest on contributions\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value ic-result-value-small\" data-ic-result=\"contribution-interest\"\u003e$4,009.56\u003c\/div\u003e\n\u003c\/div\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eGross effective annual yield\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value ic-result-value-small\" data-ic-result=\"gross-apy\"\u003e5.00%\u003c\/div\u003e\n\u003c\/div\u003e\n        \u003cdiv class=\"ic-result-card\"\u003e\n\u003cdiv class=\"ic-result-label\"\u003eApproximate real annual return\u003c\/div\u003e\n\u003cdiv class=\"ic-result-value ic-result-value-small\" data-ic-result=\"real-return\"\u003e1.94%\u003c\/div\u003e\n\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ic-live\" aria-live=\"polite\" data-ic-live\u003eEnding balance $54,535.20.\u003c\/div\u003e\n    \u003c\/section\u003e\n  \u003c\/div\u003e\n\n  \u003csection class=\"ic-section\"\u003e\n    \u003cdiv class=\"ic-section-card ic-breakdown-card\" data-ic-chart-card=\"breakdown\"\u003e\n      \u003cdiv class=\"ic-section-head\"\u003e\n\u003ch3\u003eBalance breakdown\u003c\/h3\u003e\n\u003cp data-ic-breakdown-intro\u003eSee how much of the ending value comes from the original investment, later contributions, and accumulated interest.\u003c\/p\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"ic-breakdown-content\"\u003e\u003c\/div\u003e\n      \u003cdiv class=\"ic-chart-callout ic-breakdown-caption\"\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"ic-section\"\u003e\n    \u003cdiv class=\"ic-section-card ic-chart-card ic-growth-card\" data-ic-chart-card=\"growth\"\u003e\n      \u003cdiv class=\"ic-section-head\"\u003e\n\u003ch3\u003eAccumulation over time\u003c\/h3\u003e\n\u003cp data-ic-growth-intro\u003eThe balance line shows total account value while principal and interest reveal what drives the growth.\u003c\/p\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"ic-growth-content\"\u003e\u003c\/div\u003e\n      \u003cdiv class=\"ic-chart-callout ic-growth-caption\"\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"ic-section\"\u003e\n    \u003cdiv class=\"ic-section-card ic-table-card\"\u003e\n      \u003cdiv class=\"ic-section-head\"\u003e\n\u003ch3\u003eAccumulation schedule\u003c\/h3\u003e\n\u003cp\u003eSwitch between a concise annual view and the complete monthly schedule.\u003c\/p\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"ic-table-controls\" role=\"group\" aria-label=\"Schedule detail\"\u003e\n        \u003cbutton class=\"ic-btn ic-table-toggle\" type=\"button\" data-ic-table=\"annual\" aria-pressed=\"true\"\u003eAnnual\u003c\/button\u003e\n        \u003cbutton class=\"ic-btn ic-table-toggle\" type=\"button\" data-ic-table=\"monthly\" aria-pressed=\"false\"\u003eMonthly\u003c\/button\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ic-table-overflow\"\u003e\n        \u003ctable class=\"ic-table\"\u003e\n          \u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\" data-ic-col=\"period\"\u003eYear\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eDeposit\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eInterest\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eEnding balance\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eCumulative principal\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n          \u003ctbody class=\"ic-table-body\"\u003e\u003c\/tbody\u003e\n        \u003c\/table\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ic-table-note\"\u003eDeposits are shown in the period when they enter the account. Interest is calculated from unrounded balances; displayed rows are rounded to cents.\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"ic-education\"\u003e\n    \u003cdiv class=\"ic-education-inner\"\u003e\n      \u003ch2\u003eWhat this interest calculator estimates\u003c\/h2\u003e\n      \u003cp\u003eThis calculator estimates the future value of a balance that earns compound interest while receiving optional annual and monthly contributions. It separates the final balance into the initial investment, later deposits, and interest so you can see whether growth is coming mainly from saving more or from compounding. It also estimates the balance in today’s purchasing power after inflation and applies an optional tax rate to interest as it is credited.\u003c\/p\u003e\n      \u003cp\u003eThe calculation is a planning model, not a forecast or personalized investment recommendation. Actual results may differ because account fees, changing rates, market volatility, tax timing, withdrawal rules, contribution limits, and institution-specific day-count conventions are not included.\u003c\/p\u003e\n\n      \u003ch2\u003eHow to enter each assumption\u003c\/h2\u003e\n      \u003ch3\u003eInitial investment and recurring contributions\u003c\/h3\u003e\n      \u003cp\u003e\u003cstrong\u003eInitial investment\u003c\/strong\u003e is the amount already available at the start. It is required only when you want to model an existing balance; enter zero when starting from future deposits alone. A larger initial amount generally has the strongest compounding advantage because it remains invested for the full horizon.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eAnnual contribution\u003c\/strong\u003e is deposited once per year, while \u003cstrong\u003emonthly contribution\u003c\/strong\u003e is deposited every month. Both are optional and can be used together. Enter contribution amounts as dollars, not percentages. A common mistake is to enter an annual savings target in the monthly field, which multiplies the intended contribution by twelve.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eContribution timing\u003c\/strong\u003e controls whether annual and monthly deposits are added before or after each applicable period’s interest. Beginning-of-period deposits earn one extra period of interest, so they usually produce a higher ending balance than otherwise identical end-of-period deposits.\u003c\/p\u003e\n\n      \u003ch3\u003eRate, compounding, term, tax, and inflation\u003c\/h3\u003e\n      \u003cp\u003e\u003cstrong\u003eAnnual interest rate\u003c\/strong\u003e is the nominal rate before tax. Enter 5 for 5%, not 0.05. Higher rates accelerate growth, but long-term assumptions should be chosen cautiously. The \u003cstrong\u003ecompounding frequency\u003c\/strong\u003e determines how often that nominal rate is credited. With the same nominal rate, more frequent compounding produces a slightly higher effective annual yield. Continuous compounding uses the mathematical limit of infinitely frequent crediting.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eInvestment length\u003c\/strong\u003e combines whole years with 0–11 additional months. Time matters because compound growth is nonlinear: the same rate applied for twice as long can produce more than twice the interest. The model supports up to 100 years, though very long projections become increasingly sensitive to small changes in rates.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eTax rate on interest\u003c\/strong\u003e reduces each credited interest amount. Use zero for tax-deferred, tax-exempt, or pre-tax analysis. Tax treatment varies by account and jurisdiction, so consult the relevant rules; the U.S. Internal Revenue Service provides general information about \u003ca href=\"https:\/\/www.irs.gov\/taxtopics\/tc403\" target=\"_blank\" rel=\"noopener noreferrer\"\u003etaxable interest income\u003c\/a\u003e.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eAnnual inflation rate\u003c\/strong\u003e converts the ending balance into today’s purchasing power. Inflation does not change the nominal account balance; it changes what that money may buy. Historical inflation data are available from the \u003ca href=\"https:\/\/www.bls.gov\/cpi\/\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eU.S. Bureau of Labor Statistics Consumer Price Index\u003c\/a\u003e.\u003c\/p\u003e\n\n      \u003ch2\u003eHow the calculation works\u003c\/h2\u003e\n      \u003cp class=\"ic-formula\"\u003ePeriodic rate = nominal annual rate ÷ compounding periods. After-tax periodic rate = periodic rate × (1 − tax rate). Monthly equivalent rate = (1 + after-tax effective annual yield)\u003csup\u003e1\/12\u003c\/sup\u003e − 1.\u003c\/p\u003e\n      \u003cp\u003eThe model first converts the selected nominal rate and compounding frequency into an effective annual yield, then into an equivalent monthly rate so annual and monthly contributions can share one consistent schedule. Each month, beginning contributions are added, interest is credited on the current balance, and end contributions are then added. Full-precision values are retained internally and rounded only for display and export.\u003c\/p\u003e\n      \u003cp\u003eCompound interest means each period’s return is earned on both principal and previously credited interest. The \u003ca href=\"https:\/\/www.investor.gov\/financial-tools-calculators\/calculators\/compound-interest-calculator\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSEC’s Investor.gov compound interest resource\u003c\/a\u003e offers additional educational context. Interest rates can also be influenced by broader monetary conditions; the \u003ca href=\"https:\/\/www.federalreserve.gov\/monetarypolicy.htm\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eFederal Reserve’s monetary policy pages\u003c\/a\u003e explain how policy rates affect financial conditions.\u003c\/p\u003e\n\n      \u003ch2\u003eHow to read the results, charts, and schedule\u003c\/h2\u003e\n      \u003cp\u003e\u003cstrong\u003eEnding balance\u003c\/strong\u003e is the projected nominal account value after the final month. \u003cstrong\u003eTotal principal\u003c\/strong\u003e equals the initial investment plus all deposited contributions. \u003cstrong\u003eTotal interest\u003c\/strong\u003e is the ending balance minus total principal. Interest is also split between growth attributable to the initial investment and growth attributable to later contributions.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eInflation-adjusted balance\u003c\/strong\u003e expresses the ending value in today’s dollars. A high nominal balance can still have modest real buying power when inflation is high. \u003cstrong\u003eGross effective annual yield\u003c\/strong\u003e reflects compounding before tax. \u003cstrong\u003eApproximate real annual return\u003c\/strong\u003e compares the net annual yield with inflation; a negative value means purchasing power is expected to decline even if the nominal balance rises.\u003c\/p\u003e\n      \u003cp\u003eThe balance breakdown chart compares principal sources with interest. The accumulation chart shows total balance, cumulative principal, and accumulated interest through time. When interest remains a small share, deposits are doing most of the work. When the gap between balance and principal widens, compounding is becoming more influential.\u003c\/p\u003e\n      \u003cp\u003eThe annual schedule is best for long-range review. The monthly schedule shows exact deposit timing and the interest credited in each month. The final schedule row should agree with the ending balance. Download Excel creates a workbook from the current inputs, results, breakdown, and schedule so the assumptions can be reviewed or archived.\u003c\/p\u003e\n\n      \u003ch2\u003ePractical interpretation and common mistakes\u003c\/h2\u003e\n      \u003cul\u003e\n        \u003cli\u003eCompare scenarios by changing one assumption at a time. Rate, contribution amount, timing, and horizon can interact strongly.\u003c\/li\u003e\n        \u003cli\u003eDo not treat a historical average return as guaranteed. Variable investments rarely earn the same rate every year.\u003c\/li\u003e\n        \u003cli\u003eKeep nominal and real values separate. Inflation-adjusted buying power is not the amount shown on an account statement.\u003c\/li\u003e\n        \u003cli\u003eCheck whether a quoted rate is nominal, effective, or annual percentage yield before selecting a compounding frequency.\u003c\/li\u003e\n        \u003cli\u003eInclude taxes only when they are expected to be paid from the account as interest is credited. Deferred taxation requires a different model.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\u003c\/div\u003e","brand":"FinancialModelsLab","offers":[{"title":"Default Title","offer_id":49909482029299,"sku":"interest-calculator","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0522\/6191\/2762\/files\/interest-calculator.webp?v=1783935400","url":"https:\/\/financialmodelslab.com\/products\/interest-calculator","provider":"Financial Models Lab","version":"1.0","type":"link"}