How do I calculate break-even for a startup?

Divide monthly fixed costs — mostly payroll and tooling — by contribution margin per customer. The result is the customer count that covers your costs. Then compare it against your current count and growth rate to see how many months it takes to get there, and whether your cash lasts that long.

What does default alive mean?

That your current growth rate reaches profitability on the cash you already have, without raising more. It is a more useful test than break-even alone because it accounts for time. Two companies with identical break-even points have completely different prospects if one grows at 18% a month and the other at 3%.

Should founder salaries be in break-even?

Yes, at the level you actually pay today, and you should also model market rate separately. Below-market founder pay is a real subsidy that quietly lowers your apparent break-even. A company that only breaks even while its founders are underpaid has not reached sustainable profitability.

Is it better to cut burn or raise prices?

Raise prices first, in almost every case. It improves contribution margin immediately, lowers the break-even customer count, and does not slow growth the way cutting acquisition or headcount does. Most early-stage companies are underpriced, and price increases meet far less resistance than founders expect.

How much runway should I have before break-even?

A common guideline is 18 to 24 months after a raise, and never fewer than 6 to 9 months, because fundraising itself takes 3 to 6 months. The relevant test is whether your break-even date sits comfortably before your cash-out date with room for the plan to slip — because it will.

Break Even Calculator for Startups

For a startup, break-even is not primarily a pricing question — it is a timing question. The number that matters is not how many customers you need but whether you reach that number before the cash runs out. A business that breaks even at 800 customers with eleven months of runway and a growth rate that gets it to 500 is not close to profitable; it is out of business with a good trajectory.

Enter your monthly fixed costs — which for most startups means payroll plus tooling — along with your price and variable cost per customer. Then use the runway framing below to convert the unit answer into the only question that decides the outcome: does the line cross before the money ends?

Fixed costs per month

Rent, salaries, insurance, software.

Currency

Price per unit

Variable cost per unit

Materials, shipping, card fees, commission.

Target profit (optional)

Expected units (optional)

Adds a margin-of-safety figure.

Break-even point

425 units

Equivalent to $76,438.36 in revenue for the period.

Contribution margin per unit: $146.00
Contribution margin ratio: 81.11%
Margin of safety: -63.3%
Profit at expected volume: -$24,040.00

Break-even analysis assumes price and variable cost stay constant and that your sales mix is stable. Rerun it whenever your cost structure changes.

Starting values are set for a typical startups scenario — change any field to match yours. Need the plain version? Break Even Calculator.

Default alive or default dead

The useful test, popularised in startup circles, is whether your current growth rate reaches profitability on the cash you already have. It reframes break-even from a static target into a race between two curves.

Same break-even, different outcomes
Scenario	Customers now	Monthly growth	Verdict
A	260	18%	Default alive — crosses 425 in about 3 months
B	260	8%	Marginal — crosses in about 7 months, tight against runway
C	260	3%	Default dead — needs 17 months, runway is 11
D	140	18%	Default dead on cash, alive on trajectory — needs a raise

Break-even is 425 customers in every scenario. Growth rate and runway decide the outcome, not the break-even figure itself.

What belongs in a startup's fixed costs

Payroll including employer taxes and benefits. For most software startups this is 70% to 85% of total burn, and it is the only lever large enough to change runway materially.
Cloud infrastructure baseline — the portion you pay regardless of usage. The usage-driven portion is variable.
Software and tooling subscriptions. Individually small, collectively significant, and rarely audited.
Rent, insurance, legal and accounting retainers.
Exclude one-off costs from the monthly figure but keep them in your cash forecast — a $40,000 audit or a security certification does not recur but it does consume runway.
Founder salaries below market are a hidden subsidy. Model what happens when they normalise, because your break-even moves when they do.

Extending the runway versus reaching break-even

These are different problems with different remedies, and confusing them wastes the limited time available.

Cutting burn extends runway but also usually slows growth, which can push break-even further away in time even as it moves closer in months of cash.
Raising price improves contribution margin and lowers the break-even customer count immediately — the fastest structural lever most startups have and the most consistently underused.
Reducing variable cost per customer has the same effect and compounds as you scale.
Cutting acquisition spend improves burn but reduces growth; whether that helps depends entirely on whether your acquisition is currently profitable on a contribution basis.
Recalculate monthly. Break-even, burn and growth rate all move, and a plan built on last quarter's numbers is a plan for a company you no longer run.

Frequently asked questions

How do I calculate break-even for a startup?: Divide monthly fixed costs — mostly payroll and tooling — by contribution margin per customer. The result is the customer count that covers your costs. Then compare it against your current count and growth rate to see how many months it takes to get there, and whether your cash lasts that long.
What does default alive mean?: That your current growth rate reaches profitability on the cash you already have, without raising more. It is a more useful test than break-even alone because it accounts for time. Two companies with identical break-even points have completely different prospects if one grows at 18% a month and the other at 3%.
Should founder salaries be in break-even?: Yes, at the level you actually pay today, and you should also model market rate separately. Below-market founder pay is a real subsidy that quietly lowers your apparent break-even. A company that only breaks even while its founders are underpaid has not reached sustainable profitability.
Is it better to cut burn or raise prices?: Raise prices first, in almost every case. It improves contribution margin immediately, lowers the break-even customer count, and does not slow growth the way cutting acquisition or headcount does. Most early-stage companies are underpriced, and price increases meet far less resistance than founders expect.
How much runway should I have before break-even?: A common guideline is 18 to 24 months after a raise, and never fewer than 6 to 9 months, because fundraising itself takes 3 to 6 months. The relevant test is whether your break-even date sits comfortably before your cash-out date with room for the plan to slip — because it will.