Break-Even Point: Formula, Analysis & Free Calculator

What break-even actually means

The break-even point is the sales level at which total revenue exactly equals total costs, so profit is zero — not positive, not negative. Below that level, the business operates at a loss; above it, each additional sale contributes to profit. Break-even can be expressed in units (how many items must be sold) or in dollars of revenue (how much must be sold), and both versions come from the same underlying logic about fixed costs, variable costs, and contribution margin.

Running this calculation, and testing what happens when price or costs change, is called break-even analysis. You can run your own numbers in the free break-even calculator.

The building blocks: fixed costs, variable costs, and contribution margin

Fixed costs are costs that stay the same regardless of how many units are sold over a given period, such as rent or a manager's salary. Variable costs change in proportion to units sold, such as materials or a sales commission paid per unit. Contribution margin per unit is the amount each unit sale contributes toward covering fixed costs, calculated as Price per unit − Variable cost per unit.

Once contribution margin covers all fixed costs for the period, every unit sold after that point adds to profit, which is the basic mechanic behind the break-even formula.

The break-even formula in units

Break-even units = Fixed Costs ÷ (Price per unit − Variable cost per unit)

The setup

• $50,000 fixed costs a month, $25 price, $15 variable cost per unit.

The math

1. Contribution margin per unit is $25 − $15 = $10.
2. Break-even units = $50,000 ÷ $10 = 5,000 units.

What it tells you

• Selling exactly 5,000 units in the month produces $125,000 in revenue and $125,000 in total costs ($50,000 fixed + $75,000 variable), for exactly $0 profit — confirming the formula.

The break-even formula in dollars

What happens above and below break-even

Selling 5,500 units instead of 5,000 adds 500 units of pure contribution margin above break-even: 500 × $10 = $5,000 in profit. Selling only 4,500 units leaves a shortfall of 500 units' worth of contribution margin: 500 × $10 = $5,000 short of covering fixed costs, producing a $5,000 loss for the month. The relationship is linear in both directions around the break-even point as long as price, variable cost per unit, and fixed costs stay constant.

How changes in costs or price move the break-even point

Raising the price per unit increases contribution margin per unit, which lowers the number of units needed to break even. If the price rises from $25 to $28 with variable cost still at $15, contribution margin becomes $13, and break-even units drop to $50,000 ÷ $13 = 3,846.15, so 3,847 units (you can't sell part of a unit, and 3,846 units leaves you $2 short). Conversely, an increase in fixed costs raises the break-even point directly — if fixed costs rise to $60,000 with the original $10 contribution margin, break-even units rise to $60,000 ÷ $10 = 6,000 units.

A rise in variable cost per unit, with price held constant, has the same effect as a price cut: it shrinks contribution margin and raises the number of units needed to break even.

Limits of a basic break-even calculation

The standard break-even formula assumes price per unit, variable cost per unit, and total fixed costs all stay constant across the full range of volume considered, which is a simplification. In practice, large volume changes can shift these inputs — for example, a bulk materials discount could lower variable cost per unit at higher volumes, or a jump in sales might require hiring that raises fixed costs. Break-even is a useful planning estimate based on the assumptions fed into it, not a fixed law of the business, and it should be recalculated whenever the underlying costs or price change materially.

Break-even is not the same as being financially healthy

Reaching break-even means the business is covering its costs for that period, but it does not by itself confirm the business has enough cash on hand, is growing, or is covering costs that fall outside the specific fixed and variable cost figures used in the calculation — such as owner draws, debt principal repayments (which are not an operating expense and sit outside this calculation), or irregular large expenses. Break-even analysis answers one specific question — how much sales volume covers these defined costs — and works best alongside, not instead of, a full look at cash flow and the income statement.

Frequently asked questions

Does break-even include loan payments? Only the interest portion, if it's treated as a fixed cost for the period; principal repayment reduces a liability on the balance sheet rather than being an expense, so it does not belong in the fixed or variable cost inputs to this formula.

Can a business have a different break-even point for each product? Yes. Multi-product businesses often calculate a weighted-average contribution margin ratio based on the sales mix, or compute break-even separately per product line, since each product can have its own price and variable cost.

Is reaching break-even the same as being profitable? No, break-even by definition is the point of zero profit. Profit begins only with sales volume beyond the break-even point, given the same price and cost assumptions used in the calculation.

Where can I find authoritative guidance on classifying business costs? The IRS publishes guidance on deductible business expenses, and the SBA publishes small-business planning resources. Neither replaces sorting your own costs into fixed and variable.

Related reading: see cost-plus pricing for how price per unit is set. Use the free break-even calculator to run your own numbers.