Most businesses don't fail because of a bad product. They fail because nobody ran the numbers before launch. A business idea can look completely reasonable — clear market, good product, a price people seem willing to pay — and still be financially unviable once you work out how many units you'd actually need to sell to cover your costs.
Break-even analysis is the calculation that answers that question before you find out the hard way. It tells you the exact sales volume at which your revenue equals your total costs — the point where you stop losing money. Below it, every sale is paying down overhead. Above it, you're building profit.
This guide covers the formula, walks through it step by step with real numbers, and explains what to do with the answer once you have it.
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What is break-even analysis?
Break-even analysis is a calculation that finds the point where your total revenue equals your total costs — where you're neither profitable nor losing money. It produces a single number: your break-even point, expressed as units sold per month, or as a revenue figure.
It's one of the most useful calculations a business owner can run before launching a product or service, and one of the most commonly skipped. The result doesn't tell you whether your idea is good. It tells you whether the math behind it is viable — which is a different, and arguably more important, question.
The two types of costs you need
Before running a break-even analysis, you need to split your costs into two buckets:
Fixed costs don't change with your sales volume. Rent, salaries, software subscriptions, insurance, loan repayments — these stay the same whether you sell 10 units this month or 10,000. They're the floor your revenue has to clear before you make anything.
Variable costs scale with every unit you sell. Materials, packaging, shipping, payment processing fees, sales commissions — the more you sell, the more you spend here. Variable costs get subtracted from each unit's price before the break-even formula runs.
The most common mistake in break-even analysis is treating semi-variable costs (like a part-time hire whose hours track sales) as purely fixed. When in doubt, include them as variable.
How to calculate your break-even point
Here's the formula walked through step by step, using a small product-based business as the example:
Step 1 — Total your fixed costs
Add up everything you pay each month regardless of sales. For this example: rent ($1,500) + owner pay ($1,500) + software and insurance ($500) = $3,500/month in fixed costs.
Step 2 — Calculate your contribution margin
Contribution margin = $45 − $18 = $27 per unit
The contribution margin is how much each sale actually contributes toward covering your fixed costs, after variable costs are deducted. It's the number that does all the work in break-even math.
Step 3 — Calculate break-even units
Step 4 — Convert to a revenue figure
Units are useful, but revenue is often easier to track against reality. Two ways to get there:
The full picture for this business:
What your break-even point tells you
The obvious read: 130 units is the floor. Sell fewer, you're losing money. Sell more, you're profitable.
The more useful read: break-even is a reality check on your entire business model. If you're confident you can sell 300 units a month, the math supports moving forward. If your break-even is 2,000 units and your realistic market is a few hundred people, you've found a problem worth solving now rather than six months into a lease.
It also shows you how sensitive your business is to price changes. Raise your price by $5 — contribution margin goes from $27 to $32, break-even drops from 130 units to roughly 110. Lower your price to win a deal and the opposite happens. Running the numbers first turns those decisions from gut calls into informed ones.
How to lower your break-even point
If your break-even feels uncomfortably high relative to what you can actually sell, you have four levers:
- Raise prices. The highest-impact lever. A $5 increase on a $45 product raises the contribution margin from $27 to $32 — your break-even drops from 130 units to roughly 110 with zero change to costs.
- Reduce variable costs. Negotiate with suppliers, find cheaper packaging, switch payment processors. Lower variable costs raise your contribution margin and push break-even down.
- Cut fixed costs. Renegotiate rent, cancel unused subscriptions, defer a hire. Every dollar removed from fixed costs lowers the ceiling you have to clear each month.
- Increase volume. More sales spread fixed costs across more units, effectively lowering the cost per unit. This is the growth play — it doesn't change your break-even point, but it puts you further above it.
In practice, the fastest moves are usually on pricing and variable costs. Fixed cost reduction takes longer to negotiate and implement. Volume is a result, not a lever you can pull directly.
Tools that speed up the analysis
Our Break-Even Calculator runs the full calculation instantly — enter your fixed costs, variable cost per unit, and selling price and it returns your break-even units and revenue in seconds. If you want to model multiple scenarios or track actuals against your projections over time, HoneyBook and Bonsai include financial tracking features that keep your real numbers current without maintaining a separate spreadsheet.
Frequently asked questions
What is a good break-even point?
There's no universal number — it depends on your industry, margins, and market size. The real question is whether your break-even is achievable at realistic sales volumes. A break-even of 30 units a month is very different from 3,000. Always compare your break-even to what you can actually sell, not to a benchmark.
What is the difference between fixed and variable costs?
Fixed costs stay the same regardless of how much you sell — rent, salaries, insurance, subscriptions. Variable costs scale with each unit — materials, shipping, payment processing fees, sales commissions. You need both numbers before the break-even formula can run.
What happens when I sell above my break-even point?
Every unit above break-even contributes its full contribution margin directly to profit. Below break-even you're paying down overhead; above it you're building a return. The further above break-even you operate each month, the more profitable the business becomes.
Can I run a break-even analysis for a service business?
Yes. Replace "units" with hours, projects, or clients. Your variable cost is the direct time or expense per engagement; your fixed cost is your monthly overhead. The formula works exactly the same way — and is often even more revealing for service businesses where margins are harder to see.
How often should I recalculate my break-even point?
Any time your costs or pricing change. A rent increase, a new hire, a price adjustment, a cheaper supplier — all of these shift your break-even. Treat it as a living number, not a one-time calculation you run before launch and never look at again.