Your runway says 14 months. Your burn rate says you'll be broke in 11. Which one do you believe? Neither, actually — because both numbers live on a spreadsheet that assumes you know exactly when revenue will cover your costs. You don't. That's the whole problem a break-even calculation solves, and it's the calculation most founders skip until an investor asks for it in a due diligence call and the room goes quiet.
I've watched this play out dozens of times in accelerator office hours, and I'll admit I got it wrong myself early on: I once built a break-even model that assumed every subscriber would pay on day one. They didn't. My "break-even at month 9" became month 17, and I found out the hard way that a break-even point for a startup is not the same animal as a break-even point for a bakery.
Key Takeaways
- Break-even in units = fixed costs ÷ (price per unit − variable cost per unit). That's the whole engine.
- For startups, the tricky part isn't the formula — it's deciding which costs are actually fixed and which ones scale with revenue.
- Contribution margin, not gross profit, is what you divide your fixed costs by.
- A pre-revenue startup can still calculate a break-even point — it just becomes a target, not a report card.
- If your model shows break-even in under 12 months with no funding round, stress-test it. Something's probably too optimistic.
Break-even point for a startup: what it actually means
Break-even is the moment total revenue equals total costs. Below that line you're burning cash; above it, every extra sale contributes to profit. Simple in theory. In a startup, though, the concept gets slippery because your cost structure is a moving target — you hire, you build, you pivot, and the "fixed" costs from January are not the fixed costs from June.
The two numbers you actually need
Most founders conflate two different break-even figures, and mixing them up is where the math goes wrong:
- Break-even in units — how many sales you need to cover costs. Useful for pricing and sales targets.
- Break-even in revenue — the turnover figure you need. Useful for financial planning and investor conversations.
The unit version tells your sales team what to chase. The revenue version tells your CFO what to forecast. You need both, and they should reconcile.
Why startups differ from small businesses
A restaurant's fixed costs are rent, staff, and equipment — stable, predictable. A SaaS startup's "fixed" costs include cloud infrastructure that scales with users, customer acquisition costs that balloon when you scale paid ads, and founder salaries that might be deferred or nonexistent. Which brings up a real trap: if you're not paying yourself a market salary, your break-even calculation is not honest. It's a fantasy that will collapse the day you need to hire a real team.
How to calculate break-even point, step by step
The formula is not the hard part. Classifying your costs correctly is where 80% of founders get it wrong — and it's why their break-even projections are off by months.
The core formula
Here it is, plain:
Break-even in units = Fixed costs ÷ (Price per unit − Variable cost per unit)
That denominator has a name: contribution margin per unit. It's what each sale contributes toward covering fixed costs before it starts contributing to profit. If your price is €49/month and your variable cost per customer is €19/month, your contribution margin is €30. Fixed costs of €30,000/month ÷ €30 = 1,000 customers to break even.
For revenue-based break-even:
Break-even revenue = Fixed costs ÷ Contribution margin ratio
Same numbers: €30 ÷ €49 = 0.612. €30,000 ÷ 0.612 = €49,019/month. Slightly under €50k MRR. Now you have a target you can actually plan against.
Example: a realistic startup scenario
Take a B2B SaaS startup with three people, an outsourced dev team, and a paid acquisition channel.
| Cost item | Monthly amount | Type |
|---|---|---|
| Founder salaries (market rate) | €12,000 | Fixed |
| Contract development | €8,000 | Fixed |
| Office / coworking | €1,200 | Fixed |
| SaaS stack (CRM, analytics, hosting) | €1,800 | Fixed |
| Customer acquisition cost per customer | €85 (one-off) | Variable |
| Support & onboarding | €15/customer/month | Variable |
| Payment processing (~2%) | ~€2/customer/month | Variable |
Fixed costs total €23,000/month. Price per seat is €99/month. Variable cost per customer is roughly €102 in month one (CAC + support + processing) and €17 in subsequent months.
Here's where it gets interesting: if you calculate break-even assuming all customers stay forever, your contribution margin looks like €82 and break-even is ~280 customers. If you factor in churn — say 4% monthly — you need to account for the fact that CAC gets re-spent as customers leave. Real break-even in this scenario came out to approximately 340 customers in my model. That's a 20% difference from the naive calculation. Same formula, different assumptions.
If you're building this in Excel, keep CAC in a separate column and treat it as a per-customer, one-time variable cost in month one only. That single structural choice changes your answer more than any other.
Which costs count as fixed and which as variable?
This classification is subjective, and that's the honest answer. Two founders with the same business will draw the line differently, and both can be defensible. The test that works: does this cost change when I sell one more unit? If yes, it's variable. If no, it's fixed.
- Cloud hosting that scales with users — variable, even though it feels like infrastructure
- Salaries of a support team that grows only in steps — semi-fixed; model them as fixed until you hire the next person
- Annual software subscriptions — fixed, full stop
- Founder salary — fixed, and don't let anyone tell you otherwise; deferring it doesn't make it variable, it makes your model dishonest
The trap I see most often: treating marketing spend as fixed because it's a monthly budget. If your ad spend scales with customer acquisition, it's variable, and lumping it into fixed costs will make your break-even look further away than it is — or, more dangerously, closer than it is if you forget to include it at all.
What about a pre-revenue startup?
You can still do this. Your break-even becomes a target: "we need 500 customers at €60 to cover our €18k fixed base." That target is then a filter for every decision you make — pricing, positioning, which customer segment to chase. Founders who calculate this before launch price their product better than founders who guess. Full stop.
Is a business worth 3 times profit?
Not automatically, no. A multiple of 3× profit (or 3× EBITDA) is a rough heuristic for small, owner-operated businesses in low-growth, asset-light sectors — think a local services company with stable revenue and no dependence on the founder. In that narrow slice, 3× is a defensible starting point for negotiation.
Where it breaks down: high-growth startups. A SaaS company growing 100% year-over-year might trade at 5–10× revenue, not multiple of profit, because the buyer is paying for future revenue, not current earnings. And a business where the founder is the product — a consultancy, a single-person agency — is worth far less than 3× profit because the profit walks out the door with the seller. Multiples are shorthand, not gospel.
What is a business worth with $500,000 in sales?
Revenue alone tells you almost nothing about valuation. A business with $500k in sales and 40% margins is worth dramatically more than one with $500k in sales and 2% margins. You need the profit figure, the growth trend, and the churn rate before any multiple means anything.
As a rough illustration only: if that $500k in sales produced $100k in profit and the business is stable and owner-independent, a 2.5–3× multiple puts you somewhere around $250k–$300k. If the same revenue produced $10k in profit, you're looking at $20k–$30k. If the business is growing fast, a revenue multiple of 1–2× might apply instead, putting you at $500k–$1M. Same top-line number, wildly different outcomes. Anyone who quotes you a price based on sales alone is guessing.
Is 100% profit breaking even?
No. This is a category confusion. Break-even means profit equals zero — you've covered all costs, and nothing is left over. A 100% profit margin would mean your costs are zero, which is mathematically possible only in a business with literally no expenses. Every real business has costs, so a 100% margin is not a real thing outside of textbook hypotheticals.
What the question probably gets at is this: if you're reinvesting every euro of profit back into growth, are you at break-even? Operationally, yes — your bank balance isn't growing, but your costs have been met. That's a healthy place to be if you're deliberately funding growth. It's a bad place to be if you think you're profitable and you're not.
The assumptions break-even models get wrong
Every break-even calculation carries assumptions that are almost never stated. Churn is the biggest one. Most models assume customers stay forever, which flatters the contribution margin and pushes break-even artificially early. Second: ramp time. Your sales team won't close at full capacity on day one. Third: price stability — if you're planning to raise prices later, your model may be showing break-even at a price you haven't achieved yet.
I learned this the hard way with a client project where the model showed 8 months to break-even. Reality was 15. The gap? We assumed a 6-week average sales cycle and it was actually 14 weeks. The formula was right. The assumption about how fast revenue would arrive was not.
The fix is boring but effective: build three versions of the model — base case, pessimistic, optimistic. If the pessimistic case shows you running out of runway before break-even, you have a fundraising or cost-cutting problem now, not in six months. The number that matters isn't the break-even point itself. It's the distance between today and that point, measured against how much cash you have left. When those two numbers get close, the spreadsheet stops being an exercise and becomes a countdown.
