SaaS Lifetime Value Calculator

What does this SaaS LTV calculator estimate?

This calculator estimates the gross-profit lifetime value of one average SaaS customer account. It starts with monthly average revenue per account, estimates how long an account remains active from monthly customer churn, adds optional fixed-dollar account expansion, and applies gross margin. The headline result is therefore a gross-profit contribution estimate rather than a revenue total, cash-flow forecast, valuation, or guarantee of individual customer behavior.

Use the result as a consistent unit-economics metric alongside customer acquisition cost, CAC payback, cohort retention, net revenue retention, and actual expansion performance. The model intentionally excludes sales commissions, overhead, taxes, financing costs, discounting, and irregular contract timing. For broader definitions, see Stripe’s guide to SaaS metrics and Investopedia’s customer lifetime value overview.

How should each input be used?

Average revenue per account

Choose “Enter ARPA” when you know the monthly recurring revenue generated by one active account. Enter a monthly dollar value, not annual contract value. Higher ARPA increases both Revenue LTV and Gross Profit LTV directly. Use a representative recent period and keep the customer unit consistent: accounts, workspaces, or paying organizations should not be mixed with seats unless seats are actually billed as separate customers.

MRR and active customers

Choose “Use MRR ÷ customers” when total monthly recurring revenue and the active account count are easier to obtain than ARPA. Both fields are required in this mode. MRR should include recurring subscription revenue for the same population represented by the customer count, while excluding taxes, pass-through charges, and one-time services. The calculator divides MRR by customers, so a zero customer count is invalid. Higher MRR raises ARPA; a larger customer count with unchanged MRR lowers it.

Gross margin

Gross margin is the percentage of revenue remaining after direct service-delivery costs such as hosting, infrastructure, payment processing, and support costs classified within cost of revenue. Enter a percentage from 0% to 100%. A 100% margin makes Gross Profit LTV equal Revenue LTV, while a lower margin reduces the headline result without changing expected lifetime. Do not substitute operating margin, which also reflects sales, research, and general overhead.

Monthly customer churn

Customer churn is the percentage of accounts that cancel in a typical month. It is the most sensitive assumption because expected lifetime is calculated as one divided by churn expressed as a decimal. At 4% monthly churn, expected lifetime is 25 months; at 2%, it is 50 months. Churn must be above zero because zero churn would imply an unbounded lifetime in this simplified formula. Use customer churn rather than revenue churn unless revenue-weighted customer behavior is specifically what you intend to model. Investopedia’s churn-rate explanation provides additional measurement context.

Monthly account expansion

Account expansion is a fixed dollar increase in monthly ARPA for each successive month. It can represent added seats, upgrades, add-ons, or usage growth within a surviving account. Enter zero for a flat-ARPA model. A higher value increases LTV more strongly when churn is low because the account remains active long enough for repeated expansion to compound arithmetically. Do not enter company-wide expansion MRR; use the average monthly increase per account.

How are the results calculated?

Expected lifetime equals 1 divided by monthly churn. Revenue LTV is the sum of an arithmetic revenue sequence over that lifetime: starting ARPA is earned in the first month, and each later month adds the fixed expansion amount. Gross Profit LTV multiplies the resulting revenue total by gross margin. In formula terms, Gross Profit LTV equals 0.5 × lifetime × [2 × ARPA + expansion × (lifetime − 1)] × gross margin.

Revenue LTV shows the modeled customer revenue before direct service costs. Base subscription value isolates the contribution from starting ARPA. Expansion contribution isolates the value created by the monthly expansion assumption. Those two gross-profit components always add to the headline result. A zero or negative displayed result after Reset means there is not enough valid positive input data to draw a conclusion.

How should the charts and projection table be read?

The contribution donut uses the same base and expansion values shown in the result cards. When expansion is zero, the base component is explicitly shown as 100%. A large expansion share can be attractive, but it also means more of the estimate depends on future upgrades or usage that have not yet occurred. The monthly line chart compares revenue per active account with gross profit per active account; the vertical gap represents direct cost of revenue.

The projection table reconciles the closed-form formula into monthly rows. “Modeled fraction” is one for a complete month and may be less than one in the final row when expected lifetime is fractional. “Average revenue rate” is the average ARPA represented by that interval, “Revenue contribution” is the interval’s modeled revenue, “Gross profit contribution” applies margin, and “Cumulative LTV” should equal the headline result in the final row. The downloadable workbook uses the same current-state model, tables, and assumptions.

What are the main interpretation risks?

• Mixing annual revenue with monthly churn overstates value by roughly twelve times.
• Using a short recent churn window can produce an unstable lifetime estimate, especially for small customer bases.
• Assuming expansion without cohort evidence can make LTV look more dependable than it is.
• Using revenue instead of gross profit can overstate the economic amount available to recover acquisition and operating costs.
• Treating average LTV as a promise ignores variation by plan, channel, geography, and customer cohort.

Recalculate LTV by customer segment and cohort when possible, and compare modeled results with realized gross profit. The U.S. Securities and Exchange Commission’s guidance on reading company filings is also useful when validating how public SaaS businesses define revenue, cost of revenue, and customer metrics. This calculator is educational and does not provide financial, accounting, tax, or investment advice.