Every founder eventually asks the same question: how much do I need to sell before this thing stops losing money? A break-even calculator answers that in about 30 seconds. You plug in three numbers, it tells you how many units or how much revenue you need to cover your costs. Simple. And yet most first-time founders never run the numbers, which is one reason 29% of failed startups in CB Insights' post-mortem analysis died because they ran out of cash.
The good news: you don't need an accountant or a finance degree. There are free break-even calculators that do the math for you. The trick is picking one that fits your business model and, more importantly, feeding it honest numbers.
Here's the formula, the seven calculators worth your time, and the mistakes that make break-even analysis useless.
What does a break-even calculator actually tell you?
A break-even calculator tells you the exact sales volume where total revenue equals total costs. Below that point you're losing money on every month of operation. Above it, you're profitable.
Most calculators give you the answer two ways. Break-even in units: how many subscriptions, products, or projects you need to sell. And break-even in revenue: the dollar amount of sales that covers everything.
Why does this matter before launch? Because break-even is a reality check on your entire business model. If the calculator says you need 4,000 customers a month to break even, and your total addressable market is 10,000 people, you don't have a pricing problem. You have a business model problem. Better to find that out in a spreadsheet than 18 months and $50,000 in.
How do you calculate your break-even point?
The break-even formula is fixed costs divided by your contribution margin per unit. Contribution margin is just your selling price minus the variable cost of delivering one unit.
Written out:
Break-even point (units) = Fixed costs / (Price per unit - Variable cost per unit)
A quick example. Say you're launching a SaaS product at $39/month. Your fixed costs (hosting, tools, your modest salary) run $4,000/month. Each customer costs you about $4/month in infrastructure and payment fees.
That's $4,000 / ($39 - $4) = 115 customers. Sell 114 subscriptions and you're underwater. Get to 115 and you've broken even.
Want it in revenue instead? Divide fixed costs by your contribution margin ratio. In this example that's $4,000 / 0.897, or about $4,460 in monthly recurring revenue.
That's the whole formula. So why use a calculator at all? Because the useful ones let you test scenarios instantly: what happens at $49 pricing, what happens if fixed costs jump, how many months until cumulative losses turn positive. That's where the tools below earn their spot.
Which free break-even calculators are worth using?
The short answer: Omni Calculator for speed, LivePlan for scenario testing, and a spreadsheet template when you want to keep the model. Here are the seven I'd actually point a founder to.
1. Omni Calculator (omnicalculator.com/finance/break-even). The fastest option on this list. Three inputs, instant output in units and revenue, and it recalculates as you type so you can drag your price up and down and watch the break-even point move. No signup, no email gate. Best for a first pass.
2. LivePlan's break-even calculator (liveplan.com). LivePlan is a full business planning product, but its free calculator stands alone and adds contribution margin analysis on top of the basic output. It frames results in plain language, which helps if terms like "fixed vs variable" are still new. Expect a nudge toward their paid product afterward.
3. Zoho's break-even point calculator (zoho.com). Clean, free, and part of Zoho's inventory toolkit, so it's built with physical products in mind. If you're selling actual units with per-unit costs (ecommerce, hardware, food), the framing fits naturally.
4. Upmetrics break-even calculator (upmetrics.co). Another planning-tool company with a solid free calculator. It's positioned around monthly sales goals, which is a helpful mental shift: instead of "115 customers," you see "the number I need to hit this month."
5. AngelMatch break-even point calculator (angelmatch.io). Free, no signup, aimed at startup founders rather than general small businesses. Handy if you're prepping investor conversations, since "when do you break even?" is a question that comes up in almost every pitch meeting.
6. SCORE's break-even analysis template. SCORE (the US small business mentoring nonprofit) publishes a free downloadable spreadsheet template. It's not as slick as a web calculator, but you keep the file, you can see the formulas, and you can extend it into a proper financial model later. Best option if you want to learn the mechanics, not just get an answer.
7. Your own spreadsheet. Not a product, but worth listing because it's what most funded founders end up with anyway. One row of fixed costs, one row of per-unit economics, one formula. Ten minutes in Google Sheets and you own the model forever.
One thing none of these will do: hand you good inputs. A calculator with bad numbers is just a fast way to get a wrong answer, which brings us to the next section.
What numbers do you need before you open a calculator?
You need three inputs: monthly fixed costs, variable cost per unit, and price per unit. Getting these right is 90% of the work.
Fixed costs are everything you pay whether you sell zero units or a thousand. Rent, software subscriptions, insurance, salaries, that $99/month tool you forgot about. Go through your last three months of bank statements rather than estimating from memory. Founders who estimate from memory routinely miss 20-30% of their actual fixed costs.
Variable costs scale with each sale. Materials, shipping, payment processing (typically 2.9% + 30 cents on Stripe), per-seat infrastructure, sales commissions. For SaaS these look tiny per unit, which is exactly why SaaS margins are attractive. For physical products they're often 40-60% of the price.
Price is what you actually charge. If you discount, use your realistic average selling price, not your list price.
And one honest warning: put your own salary in fixed costs, even a small one. "We break even" while you pay yourself nothing isn't breaking even. It's subsidizing the business with free labor.
What mistakes make break-even analysis useless?
The biggest mistake is treating break-even as a one-time exercise instead of a living number. Your costs change, your pricing changes, and last quarter's break-even point is already stale.
A few others I see constantly:
- Leaving out hidden fixed costs. Annual subscriptions billed once a year, accounting fees, that conference you expense every spring. Divide annual items by 12 and put them in.
- Ignoring churn in subscription models. If you need 115 customers to break even and you lose 5% of them monthly, you're not just selling to 115. You're refilling a leaky bucket while you climb.
- Using aspirational pricing. Running the numbers at the $79 tier you hope to charge someday, while everyone actually pays $39.
- Confusing break-even with success. Break-even means you've stopped losing money. It says nothing about paying back what you already spent, or about whether the business is worth your time. That's what payback period and unit economics are for.
- Forgetting your time horizon. Reaching break-even in month 6 vs month 26 are wildly different businesses, even if the monthly math looks identical. Your runway decides which timelines you can survive.
None of these are math errors. They're judgment errors, which is why the calculator is the easy part.
Should you use a web calculator or build a spreadsheet?
Use a web calculator to sanity-check an idea in minutes, and build a spreadsheet once you're serious. They solve different problems.
Web calculators are perfect for the exploration phase. You're comparing three pricing ideas, or testing whether a business model can work at all. Speed matters, precision doesn't.
But a web calculator forgets your numbers the moment you close the tab. Once you're actually operating, you want a model you revisit monthly: real costs pulled from your bank statement, real average selling price, real churn. That lives in a spreadsheet or a planning tool, not a one-off web form.
The founders who get burned are the ones who ran a calculator once in January, got a comforting answer, and never looked again.
How does break-even fit into your bigger financial model?
Break-even is one output of a financial model, not a substitute for one. It sits alongside your startup cost estimate, revenue forecast, burn rate, and runway, and it's only as current as the assumptions feeding it.
The natural sequence looks like this. First, estimate startup costs (what you spend before revenue exists). Second, build a simple monthly forecast of costs and sales. Third, calculate break-even from those numbers. Fourth, check it against your runway: can you survive long enough to get there?
You can wire this together in a spreadsheet, in Notion, or in a planning tool like Foundra or LivePlan that walks first-time founders through financial projections step by step. Foundra also keeps a set of free startup calculators at foundra.ai/tools/ if you want to work through the related numbers (naming, pitch, costs) in one place.
However you build it, the point is the same: break-even shouldn't be a number you calculated once. It should be a number your model updates every time reality changes.
Key takeaways
- A break-even calculator tells you the sales volume where revenue covers total costs, in units and in dollars.
- The formula is fixed costs divided by contribution margin (price minus variable cost per unit).
- For a fast free answer, Omni Calculator is the best starting point. LivePlan and Upmetrics add scenario framing, Zoho suits physical products, AngelMatch targets founders, and SCORE's template teaches you the mechanics.
- Your inputs matter more than your tool. Pull fixed costs from real bank statements, use realistic pricing, and include your own salary.
- Break-even is a living number. Recalculate it whenever costs, pricing, or churn change, and always check it against your runway.
FAQ
What is the break-even formula?
Break-even (units) = fixed costs / (price per unit - variable cost per unit). For break-even in revenue, divide fixed costs by your contribution margin ratio instead.
What's the best free break-even calculator?
Omni Calculator for a fast, no-signup answer. If you want scenario testing and plain-language explanations, LivePlan's free calculator is stronger. For a reusable model, download SCORE's spreadsheet template.
What's a good break-even point for a startup?
There's no universal number. What matters is whether you can reach it before your cash runs out. A break-even point 6-12 months out with your current runway is workable. One that lands past your runway means you need to raise, cut costs, or reprice.
Do I include my own salary in break-even analysis?
Yes. Even a below-market salary belongs in fixed costs. Excluding it makes the business look healthier than it is and hides the real cost of running it.
How is break-even different from profitability?
Break-even is the moment monthly revenue covers monthly costs. Profitability is sustained revenue above costs. And neither accounts for the money you spent getting there; that's your cumulative loss, which payback analysis covers.
How often should I recalculate my break-even point?
Monthly, or any time a major input changes: a price change, a new hire, a big new subscription, or a shift in churn. It takes five minutes with a saved spreadsheet.
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