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Before a business turns a profit, it first has to cover its costs — and knowing exactly how many units that takes is one of the most useful numbers in early planning or pricing decisions. This calculator takes your fixed costs (rent, salaries, software — costs that don't change with sales volume), your price per unit, and your variable cost per unit (materials, shipping — costs that scale with each sale), and works out exactly how many units you need to sell to break even.
It also reports your contribution margin — how much of each sale actually goes toward covering fixed costs (and eventually, profit) after variable costs are paid — both as a dollar amount per unit and as a percentage of the price.
How it works
Enter your total fixed costs for the period, the price you charge per unit, and the variable cost to produce or deliver one unit. The calculator subtracts variable cost from price to get your contribution margin per unit, then divides fixed costs by that margin to find how many units you need to sell to break even — rounded up, since you can't sell a fraction of a unit and still need to fully cover costs. It also shows the resulting break-even revenue and your contribution margin as a percentage.
- Enter your fixed costs for the period.
- Enter the price per unit and the variable cost per unit.
- Review the break-even units, revenue and contribution margin.
Examples
A product business
A business with $10,000 in monthly fixed costs sells a product for $50 with $30 in variable cost per unit. The $20 contribution margin means it needs to sell 500 units a month ($25,000 in revenue) to break even.
A tighter margin
The same $10,000 in fixed costs but a $33 price and $10 variable cost gives a $23 contribution margin — needing 435 units to break even (10,000 ÷ 23 rounds up from 434.78), showing how a smaller margin per unit requires meaningfully more volume to cover the same fixed costs.
Who should use it
- Deciding whether a planned price covers costs at a realistic sales volume.
- Estimating how many units a new product needs to sell before turning a profit.
- Comparing how a price change affects the sales volume needed to break even.
- Sanity-checking a business plan's sales projections against its actual cost structure.
Industry applications
- Small business and startup planning
- Retail and e-commerce pricing
- Manufacturing and product costing
- Freelance and service pricing
Advantages
- Reports break-even in both units and revenue, plus the underlying contribution margin.
- Rounds break-even units up correctly, avoiding a false "you've broken even" reading.
- Flags mathematically impossible inputs (negative or zero margin) instead of returning a nonsensical result.
Limitations
- Assumes a single product/price point — doesn't model a multi-product sales mix.
- Doesn't account for costs that step up at certain volumes (e.g. needing to hire more staff past a threshold).
- Treats fixed and variable costs as constant regardless of scale, which may not hold at very high volumes.
Common mistakes to avoid
- Misclassifying a cost as fixed when it actually scales with sales volume, or vice versa.
- Forgetting to include all relevant variable costs (packaging, payment processing fees, shipping) when calculating variable cost per unit.
- Rounding the break-even unit count down instead of up, understating what's actually needed to cover costs.
- Treating break-even as a one-time calculation instead of recalculating when costs or pricing change.
Best practices
- Recalculate break-even whenever fixed costs, pricing, or variable costs change meaningfully.
- Include every real variable cost per unit, not just the most obvious one (materials), to avoid understating what's needed to break even.
- Use the contribution margin percentage to quickly compare how pricing changes affect how much volume you'd need.
Tips
- If break-even volume looks unrealistically high, revisit your price and variable costs before assuming you just need to "sell more."
- Track your actual contribution margin percentage over time — a shrinking margin means costs are creeping up relative to price even if revenue looks stable.