Break-even analysis: formula, example and how many sales you need

Break-even analysis estimates the sales needed to cover a defined set of costs. It is useful for testing a price, a new service or a recurring commitment. Its answer is only as reliable as the cost assumptions and does not replace cash-flow planning.

Separate fixed and variable costs

Fixed costs do not change with each additional sale within the period and capacity range being considered. Variable costs increase with delivery volume. Some costs are mixed: hiring another person can create a step change once capacity is reached. Choose a specific period and avoid mixing annual overhead with monthly sales.

Calculate contribution per sale

Contribution is selling price minus variable cost per sale. Break-even units equal fixed costs divided by contribution per unit, rounded up when you sell whole units. If contribution is zero or negative, extra sales do not cover fixed costs under those assumptions. Check the offer or cost structure before treating higher volume as the solution.

Worked example: a service appointment

Imagine monthly fixed costs of 3,000 currency units. An appointment sells for 120 and has variable costs of 45, leaving contribution of 75. Break-even is 3,000 ÷ 75 = 40 appointments. At 50 appointments, the model leaves 750 after those fixed and variable costs, before any excluded expenses or taxes.

Check whether the volume is possible

Forty appointments may sound easy until you account for travel, preparation, cancellations and administrative time. Compare the required volume with realistic capacity and demand. If you sell several services, use a plausible mix rather than pretending every sale has the same contribution. Test slower sales and higher-cost scenarios explicitly.

Are owner compensation and required overhead included?
Is the assumed selling price the amount actually received?
Do refunds or rework change variable costs?
Will more volume require additional fixed capacity?

Use break-even alongside cash timing

Covering monthly costs does not mean cash arrives before bills are due. A business with payment delays may need a buffer even after reaching break-even. Compare the model with actual results and explain the differences. Have a qualified financial adviser review important expansion or borrowing decisions rather than relying on a single simplified calculation.