Before you launch a product, expand into a new market, hire an extra member of staff, or sign a lease on new premises, there is one number you absolutely need to know: your break-even point. It's the minimum level of sales at which you stop losing money and start making it. Miss it and you're running on hope. Know it and you're running a business.
What Is the Break-Even Point?
The break-even point (BEP) is the level of sales at which your total revenue equals your total costs — you're making neither a profit nor a loss. Every sale above the break-even point generates profit. Every sale below it represents a loss.
There are two versions of the BEP: in units (how many products do you need to sell?) and in revenue (how much money do you need to take in?). Our break-even calculator calculates both instantly once you input your costs and price.
Fixed Costs vs Variable Costs
To calculate your BEP, you first need to understand the difference between your costs:
- Fixed costs: costs that don't change regardless of how many units you sell — rent, salaries, insurance, software subscriptions. If you sell zero units, these still exist.
- Variable costs: costs that scale with production — raw materials, packaging, delivery costs per unit, commission.
This distinction matters because fixed costs are the "mountain" your business needs to climb before you make a penny of profit. Variable costs scale with success, so they're less frightening.
The Break-Even Formula
Break-even in units = Fixed Costs ÷ (Selling Price per Unit − Variable Cost per Unit)
The bottom part of that formula — Selling Price minus Variable Cost per Unit — is called the Contribution Margin. It's the amount each sale "contributes" towards covering your fixed costs. Our contribution margin calculator helps you work this out across your product range.
A Real Example
You run a small bakery. Your monthly fixed costs (rent, insurance, equipment lease) total £3,000. Each loaf of bread sells for £3.50 and costs £1.20 in ingredients and packaging (variable cost).
- Contribution margin per loaf: £3.50 − £1.20 = £2.30
- Break-even in units: £3,000 ÷ £2.30 = 1,304 loaves per month
- Break-even in revenue: 1,304 × £3.50 = £4,565 per month
You need to sell 1,304 loaves a month just to cover your costs. Any loaf sold beyond that contributes £2.30 of pure profit. If you're currently selling 1,000 loaves, you know exactly how big the gap is and can set a clear sales target.
Why Break-Even Analysis Is So Useful
Once you know your BEP, you can use it to make better decisions:
- Pricing decisions: What happens to the BEP if you raise or lower prices?
- Cost decisions: How does hiring a new employee (adding to fixed costs) change the BEP?
- Revenue targets: Set sales targets that are grounded in actual required performance, not wishful thinking.
- New product launches: Is the market large enough to realistically reach break-even on a new line?
- Loan decisions: Can you service additional debt while maintaining profitability?
Break-Even Point in Revenue
If you sell multiple products at different prices, the unit-based BEP becomes complicated. Instead, calculate the break-even in revenue using your average contribution margin ratio:
Break-even Revenue = Fixed Costs ÷ Contribution Margin Ratio
Where Contribution Margin Ratio = (Revenue − Variable Costs) ÷ Revenue. This gives you a sales revenue target rather than a unit target.
The Margin of Safety
Your margin of safety is how far your actual sales are above the break-even point — expressed as a percentage. If your BEP is £4,565 per month and you're currently making £6,000 in sales, your margin of safety is (£6,000 − £4,565) ÷ £6,000 × 100 = 24%. A larger margin of safety means more resilience if sales dip unexpectedly.
Common Mistakes in Break-Even Analysis
- Misclassifying costs: Some costs are semi-variable — they change, but not proportionally with sales. Be honest about which bucket they belong in.
- Forgetting about tax: BEP is typically calculated pre-tax. Factor in tax when setting profit targets.
- Treating BEP as a sales target: Break-even is the minimum, not the goal. You should be targeting meaningful profit above it.
Break-even analysis is one of the most powerful, accessible tools in business finance. It takes five minutes to calculate and can fundamentally change how you think about pricing, costs, and growth.
Further reading: Investopedia's break-even analysis article covers the concept in depth with additional examples. Read Investopedia's guide to break-even analysis.