How to Calculate Your Business's Break-Even Point

Break-even analysis answers one of the first questions any new product or business needs answered: how many units do we need to sell before we stop losing money?

The formula

Break-Even Units = Fixed Costs / (Price per Unit − Variable Cost per Unit)

The denominator — price minus variable cost — is called the contribution margin per unit: the amount each individual sale contributes toward covering fixed costs, after covering its own direct production cost.

Worked example

Fixed costs of $10,000 (rent, salaries, insurance — costs that don't change with sales volume), a selling price of $50 per unit, and a variable cost of $20 per unit to produce each one: contribution margin is $50 − $20 = $30. Break-even units = 10,000 / 30 ≈ 334 units (rounding up, since selling 333.33 units isn't physically possible).

Revenue at that break-even point is 334 × $50 = $16,700 — notice this is higher than the $10,000 in fixed costs, because the first 334 units also had to cover their own $20 variable cost each, on top of contributing toward fixed costs.

Why contribution margin, not price, is the key lever

Raising the price from $50 to $60 (holding variable cost at $20) increases contribution margin to $40, dropping break-even to 10,000/40 = 250 units — a large reduction from a comparatively modest 20% price increase, because contribution margin absorbs the entire price change while variable cost stays flat.

What happens if variable costs rise instead

Keep the $50 price but let variable cost rise to $30 (say, due to a supplier price increase): contribution margin drops to just $20, and break-even rises to 10,000/20 = 500 units — a much higher bar to clear, from what looks like a modest $10 cost increase. This asymmetry — small cost increases having an outsized effect on break-even — is exactly why businesses watch input costs closely.

Common mistakes to avoid

• Forgetting to separate fixed costs (rent, salaried staff) from variable costs (materials, hourly labor, shipping per unit) — mixing them up invalidates the whole formula
• Assuming break-even in units automatically means break-even in time — you still need a realistic sales-volume timeline to know when (not just "how many") you'll actually break even
• Ignoring that this is a before-tax break-even point; actual profitability after tax requires additional units beyond the strict break-even count

Calculate your own break-even point with the break-even calculator, and check your product's margin with the margin calculator.