How to Calculate Your Break-Even Point (With Real Numbers)

"How many do I need to sell to stop losing money" is one of the few business questions with an exact, calculable answer. Break-even analysis isn't a rough estimate — it's arithmetic, and getting the three inputs right matters more than the formula itself.

The Formula, Explained

Break-even point in units = Fixed Costs ÷ (Price − Variable Cost per Unit). Fixed costs are expenses that don't change with how much is sold — rent, software subscriptions, salaried staff. Variable cost per unit is what it costs to produce or deliver one more unit — materials, a per-order processing fee, hourly contractor time tied directly to that unit. Price minus variable cost is the contribution margin: how much of each sale is left over to pay down fixed costs before any profit begins. The U.S. Small Business Administration's break-even calculator uses this same formula as its foundation for business planning.

Worked Example: A Solo Service Business

A solo business has $3,200 a month in fixed costs (software, a coworking desk, insurance). It sells a service package at $45, with $18 in variable cost per package (contractor time, materials, payment processing). The contribution margin is $45 − $18 = $27 per unit. Break-even units = $3,200 ÷ $27 = 118.5, rounded up to 119 units, since a partial unit doesn't fully cover costs. At $45 each, that's $5,355 in monthly revenue just to reach zero profit — the 120th unit and beyond is where the business actually makes money.

Step-by-Step: Calculating Your Own Break-Even Point

List every fixed cost that continues regardless of sales volume for one month, and total it. List the true variable cost of delivering exactly one unit — be specific, since underestimating this is the most common error and makes the break-even point look lower than it really is. Subtract variable cost from price to get the contribution margin. Divide total fixed costs by the contribution margin, and round up to the next whole unit.

What Changes the Break-Even Point

Raising the price is usually the fastest lever. In the same example, raising price from $45 to $50 (variable cost unchanged at $18) increases the contribution margin to $32. New break-even units = $3,200 ÷ $32 = 100 units — 19 fewer units needed to cover the same fixed costs, without any change to how the business operates.

Using Break-Even to Evaluate a New Fixed Cost

Break-even analysis is also a decision tool for a new expense, not just a snapshot of the current business. Take the same $3,200-fixed-cost, $27-contribution-margin business considering a $500-a-month part-time assistant. New fixed costs become $3,700; new break-even units = $3,700 ÷ $27 = 137.04, rounded up to 138 — 19 more units a month than the current 119, before the hire even becomes worth it in dollar terms.

Framed that way, the real question isn't "can I afford $500 a month" but "will this hire reliably help sell 19 more units a month" — a much more concrete test than a gut-feel budget decision, and one that applies to any new recurring cost: software, advertising, a subscription tool, or additional space.

The Short Version

Break-even units = Fixed Costs ÷ (Price − Variable Cost). In the worked example, $3,200 in fixed costs and a $27 contribution margin means 119 units, or $5,355 in revenue, before any profit begins. The two levers that move this number are lowering fixed costs and raising the contribution margin — through price, lower variable cost, or both — and the same formula works in reverse, as a concrete test for whether a new recurring cost is actually worth adding.

FAQ

Educational resource only, not financial or business advice. The figures above are an illustrative example; your own costs, pricing, and margins will differ. See the U.S. Small Business Administration's break-even point calculator for further reading.