Break-Even Sales: Revenue vs Number of Units
Break-even revenue is the sales value needed to cover fixed costs after variable costs. To estimate a unit or transaction count, divide break-even revenue by the average sale value and round up.
Calculate break-even revenue first
For a percentage-based model, calculate the contribution-margin ratio as 1 minus the variable-cost share. Then divide fixed costs by that ratio. Example: $5,000 fixed costs ÷ 0.65 contribution margin = $7,692.31 break-even revenue.
Convert revenue into a sales count
Divide the break-even revenue by average sale value, then round up because a partial sale is not usually possible. If average sale value is $100, $7,692.31 ÷ $100 = 76.92, so the estimate is 77 sales.
The break-even calculator performs this conversion when you enter an average sale value. For services, subscriptions or mixed baskets, treat the result as an approximate transaction count based on your average.
When a unit contribution calculation is more suitable
If you know a single product’s selling price and variable cost per unit, another model is break-even units = fixed costs ÷ (unit price − variable cost per unit). This assumes the product price and unit variable cost remain stable. A multi-product business with different margins may need a sales-mix model rather than one average.
Revisit assumptions when costs, prices or sales mix change. The result is a planning estimate, not a guarantee of sales or cash flow.
Try the related calculator
Use the Small business break-even calculator to apply the formula to your own figures. Results are estimates using the assumptions shown on the tool page.
Frequently asked questions
How many sales do I need to break even?
Estimate break-even revenue, divide it by the average value per sale and round up. This assumes the average sale value and cost pattern remain representative.
Is break-even revenue the same as break-even units?
No. Revenue is a dollar target; units or transactions are a count. Convert between them using average sale value, or use a per-unit contribution formula for a single product.
Why does my actual break-even differ from the calculator?
Actual costs, prices, refunds, sales mix, timing and one-off expenses can differ from your inputs. The calculator is a simplified model based on the assumptions shown.