Biodegradable Phone Case Break-Even Analysis: $22K/Month

Fixed costs $3.2K/mo Monthly base burn

Contribution margin 83% After variable costs

Break-even revenue $3.9K/mo Revenue at zero profit

Break-even timing Month 38 Model break-even month

Break-even calculator

Use this calculator to test whether monthly revenue covers variable expenses and fixed monthly costs, and how close the business is to break-even.

Lean Base Full

Monthly revenue Revenue sets the pool that has to cover direct costs and overhead. $ Low sales High sales Variable expenses These direct costs rise with each sale, like materials, fees, and shipping. $ Low costs High costs

Money available to cover fixed costs $29,750 $35,000 revenue - $5,250 variable expenses

Margin ratio

85%

Covers fixed costs

Yes

Fixed monthly costs These monthly costs stay in place even when sales slow. $ Lean base Heavy base

Break-even chart Revenue Total costs

Which costs are fixed, and which move with biodegradable phone case sales?

Cost classification

Break-even only works when each expense follows the right behavior. Treat unit-linked costs as variable, monthly overhead as fixed, and planned step-ups like marketing and payroll as semi-fixed so Month 38 breakeven isn’t overstated.

Expense	Cost	Break-Even Treatment	Common Mistake
Raw Materials & Manufacturing	Variable	Model as 8.0% of revenue in the first year, improving to 6.0% by the mature year.	Treating materials as fixed and overstating margin when sales rise.
Packaging & Assembly	Variable	Apply 2.0% of revenue in the first year, falling to 1.5% as volume improves.	Leaving packaging out of unit economics because each item feels small.
E-commerce & Payment Fees	Variable	Use 2.5% of revenue in the first year, dropping to 2.0% by the mature year.	Booking payment fees below the line instead of against each sale.
Shipping & Fulfillment	Variable	Use 4.5% of revenue in the first year, improving to 3.5% as fulfillment scales.	Assuming shipping is covered by price without testing order-level margin.
Website Platform Fees	Fixed	Include $500 per month in monthly overhead for the full model period.	Spreading the fee per order and making low-volume months look safer.
Office Rent	Fixed	Include $1,500 per month while the space stays within current capacity.	Ignoring rent in break-even because it doesn’t touch the product.
Marketing Budget	Semi-fixed	Plan the first year at $50,000, then step it up by year based on the budget.	Modeling all marketing as variable CAC and missing planned spend commitments.
Payroll	Semi-fixed	Use $132,500 in first-year salaries, then step up with forecast headcount and FTE changes.	Treating staff as fully variable or excluding founder salary from operating break-even.

How does break-even shift from a lean launch to base growth and full scale for biodegradable phone cases?

Scenario table

Lean tests demand, base checks repeat buying, and full scale finally clears fixed overhead. Even so, the model stays loss-making in Years 1 to 3 before turning positive in Year 4.

Planning assumptions only; actual results can move with demand, costs, and fulfillment load.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean demand test	$2,500	$425	$18,408	83%	-$16,333	At about $22,178 break-even revenue, this stays far below cover.
Base repeat-order build	$41,500	$6,225	$49,117	85%	-$13,842	At about $57,784 break-even revenue, repeat orders still have to close the gap.
Full-scale growth plan	$231,800	$30,134	$73,200	87%	$128,466	At about $84,138 break-even revenue, it clears break-even and builds cushion.

What breaks the break-even plan for this biodegradable phone case?

Stress test

The plan is tight at launch. At 83.0% contribution margin, it needs about $22.2k a month to cover $18.4k of fixed costs. CAC above $30, fulfillment above 45% of revenue, returns, or early payroll push it off track.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change in price mix or cost ratios.	$22,178/month	$0 gap	This is the minimum monthly sales level.
Revenue shortfall	Monthly sales slip to $18,000.	$22,178/month	$3,468 gap	$18,000 sales still miss fixed costs.
Fixed-cost increase	Fixed monthly costs rise to $22,000.	$26,506/month	$7,060 gap	Extra overhead adds a much larger monthly hole.
Margin pressure	Variable expenses rise from 17.0% to 22.0%.	$23,600/month	$4,368 gap	Fees, shipping, or returns eat more of each sale.
Combined pressure	Sales stay at $18,000, variable expenses rise to 22.0%, and fixed costs rise to $22,000.	$28,205/month	$7,960 gap	CAC above $30, heavy fulfillment, returns, or early payroll can widen the gap fast.

Can you scale inventory and monthly spend without missing break-even?

Founder checklist

Not yet. First confirm the unit math, channel cost, and cash cushion still work, because the model only clears break-even at roughly 777 orders a month, with a $131K cash low point before Month 38 and a 56-month payback.

1Run rate777 orders/mo

Check demand can reach this pace before larger buys, because that is the volume needed to cover overhead.

2Gross margin83% CM

Verify supplier, packaging, payment, and shipping quotes still leave about 83% contribution margin, or each sale funds less fixed cost.

3Basket size$28.55 AOV

Hold the first-year mix and 1.1 units per order near plan, because a smaller basket pushes break-even revenue higher.

4CAC$30 CAC

Track paid acquisition against the Year 1 target and keep repeat buyers near 15.0%, or customer payback slows fast.

5Hiring gate$22.2K/mo

Delay major hiring until revenue is above this level, so added wage load does not push break-even farther out.

6Cash buffer$131K

Separate the $68K setup spend from monthly break-even and keep enough cash to reach Month 38, because payback runs 56 months.