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About this tool
Calculate zero-profit break-even units, revenue, margin of safety, profit targets, and cost-volume scenarios.
The Break-Even Calculator works out how many units you must sell before a product stops losing money, using the standard formula break-even units = fixed cost ÷ (selling price − variable cost per unit). Enter your fixed cost, per-unit variable cost, selling price, expected sales and a profit target, and it returns contribution per unit, contribution margin, break-even revenue, the units needed to hit your target profit, and margin of safety. A cost-volume-profit chart marks the exact unit count where the revenue and total-cost lines cross, and the whole scenario table exports to CSV.
Open Break-Even Calculator on AltFTool — it loads instantly in your browser.
Fill in the Cost & Price Inputs panel - Fixed Cost, Variable Cost / Unit and Selling Price / Unit in rupees, then Expected Sales Units, Target Profit, a Tax Rate capped at 80%, and Chart Max Units. There is nothing to submit: every figure on the page recalculates as you type.
Read Break-even Units and Break-even Revenue at the top, alongside Contribution / Unit, Expected Profit, Target Profit Units, Margin of Safety and Tax Estimate. If the selling price does not clear the variable cost, the badge flips to Price below variable cost and both unit figures read Not possible.
Compare the Cost Volume Profit Chart, where the revenue and cost areas cross at the dashed break-even line, with the Profit Curve, Expected Sales Split and Scenario Table. Load Sample and Simple Plan swap in preset figures, Copy Summary puts the plain-text breakdown on your clipboard, and Export CSV downloads break-even-scenario.csv.
Plots revenue against total cost across your full unit range so you can see how fast profit turns positive after the crossover.
Calculates units for zero profit and units for a stated profit goal side by side, using (fixed cost + target profit) ÷ contribution.
If the selling price is at or below variable cost, contribution is zero or negative and the tool says break-even is not possible instead of printing a misleading figure.
Divide total fixed cost by the contribution per unit, where contribution = selling price − variable cost per unit. With ₹4,50,000 fixed cost, an ₹850 price and ₹320 variable cost, contribution is ₹530 and break-even is 850 units, rounded up because you cannot sell a fraction of a unit.
Margin of safety is (expected units − break-even units) ÷ expected units, and many small businesses treat anything under about 20 percent as thin because a modest sales miss then pushes you into a loss. A negative figure means your forecast sales are below break-even.
Because a loss-making period has no profit to tax, the tool applies your tax rate to profit before tax only when that figure is above zero. Loss carry-forward and set-off rules vary by jurisdiction, so treat the tax line as an estimate and confirm it with an accountant.
Add the profit you want to your fixed cost, then divide by contribution per unit: (fixed cost + target profit) ÷ contribution. With ₹4,50,000 fixed cost, ₹2,50,000 target profit and ₹530 contribution, that is 1,321 units.
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