The Break-Even Calculator finds the sales level at which a business covers its costs exactly — no profit, no loss — in both units and revenue. Itemize your fixed costs (or enter them as one figure), set your price and variable cost per unit, and it also answers the follow-ups: units needed for a target profit, the profit at your current sales, and your margin of safety.
How It Works
Every sale contributes the difference between price and variable cost toward your fixed costs. That difference — the contribution margin — is the engine of the whole analysis:
Units are rounded up — selling a fraction of a unit is impossible, and rounding down would leave you a few dollars short of actually breaking even. Fixed costs can be itemized (rent, salaries, insurance, debt payments, marketing, other) and are summed with any base figure you enter. If the price is not greater than the variable cost, the calculator refuses: at a zero or negative margin, no volume of sales can ever break even.
Worked Example
A small studio with itemized monthly fixed costs: rent 3,500 + insurance 700 + other 7,000**. Its product sells at 30:
- Contribution margin = 30 = $20; margin ratio = 20 ÷ 50 = 0.40
- Break-even units = ⌈7,000 ÷ 20⌉ = 350 units
- Break-even revenue = 7,000 ÷ 0.40 = $17,500
- For a $10,000 target profit: ⌈(7,000 + 10,000) ÷ 20⌉ = 850 units
- At current sales of 500 units: profit = 500 × 7,000 = $3,000, and the margin of safety is 500 − 350 = 150 units, or 30% — sales can fall 30% before losses begin
Reading the Result
Break-even units is a feasibility test before it is a target: if the number demands more of the market than plausibly exists, the model — price, costs, or both — has to change, not the hope. The margin of safety is the resilience measure lenders and buyers look at, because it prices the distance between your current trading and the loss line. And the target-profit extension is the honest way to plan pricing: it treats profit as a cost the price must cover, which is how sustainable prices are actually set.
The three levers are not equal. Raising price widens the margin on every unit but may cost volume; cutting variable cost widens it without touching the customer's price; cutting fixed costs lowers the numerator outright. A 52, margin $22) drops break-even to 319 units — often cheaper than finding 31 more buyers a month at the old price.
Limitations
This is single-product, single-price analysis with constant variable costs. Multi-product businesses need a sales-mix-weighted margin; volume discounts, stepped fixed costs (the second premises, the next hire), and bulk savings on materials all bend the straight lines the formulas assume. Break-even also ignores cash timing — a business can be above break-even on paper and still fail on cash flow if customers pay slowly. Use it for viability and pricing decisions, alongside a cash-flow forecast, not instead of one.
Frequently Asked Questions
Why are break-even units rounded up?
Because the unrounded answer — say 350.2 units — is not a sales level that exists. Selling 350 units leaves you just short of covering fixed costs; 351 covers them. The ceiling rounding guarantees the reported figure truly breaks even, and break-even revenue is computed from the margin ratio so it stays consistent with the exact threshold.
What if my price equals my variable cost?
The calculator returns an error, correctly. At a zero contribution margin every sale contributes nothing toward fixed costs, so break-even sits at infinity; below it, each sale deepens the loss. Raise the price, cut the variable cost, or reconsider the product — volume cannot rescue a negative margin.
How do I include a salary for myself?
Add it to fixed costs (in the salaries line or the base figure). Owner compensation is the most commonly omitted fixed cost in small-business break-even analysis, and omitting it manufactures a fictional break-even that pays everyone except the owner.