Contribution per Unit Calculator
How much of each sale remains after variable unit costs? Check the formula, a worked example and the stated measurement limits.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Unit selling price (currency/unit) | Enter unit selling price in currency/unit. Use the measurement basis described below. |
| Variable cost per unit (currency/unit) | Enter variable cost per unit in currency/unit. Use the measurement basis described below. |
| Units sold (units) | Enter a whole count in units; keep the reporting population consistent. |
Understanding your result
Contribution shows what remains to cover fixed costs and then profit. It is different from net margin and can guide a cost-volume scenario.
Common mistakes
- Contribution is not net profit.
- Gross margin and contribution margin may use different cost classifications.
- Mixing annual and monthly periods, or leaving out a cost that the model does not include.
Check your calculation
- Compare a simple one-period or zero-change case with hand arithmetic before applying a longer scenario.
Choose a consistent measurement basis
Separate variable costs from fixed period costs. Include relevant payment, fulfilment, commission and service costs rather than only the product purchase price.
A second independently worked case
Costs above price give negative contribution; two units lose ten before fixed costs. Inputs: Unit selling price: 10 currency/unit; Variable cost per unit: 15 currency/unit; Units sold: 2 units. Results: Contribution per unit: -5 currency/unit; Contribution margin ratio: -50 %; Total contribution: -10 currency.
Precision and output units
Displayed results: Contribution per unit in currency/unit, rounded to 2 decimal places; Contribution margin ratio in %, rounded to 2 decimal places; Total contribution in currency, rounded to 2 decimal places. Display rounding does not establish the precision of the original measurements or estimates. A small positive rate can round to 0.00%; inspect the underlying counts before treating displayed zero as an absence of events.
Calculation checks, sources and review limits
How much of each sale remains after variable unit costs?
How much of each sale remains after variable unit costs? Check the formula, a worked example and the stated measurement limits.
Common uses
- How much of each sale remains after variable unit costs
- Compare Contribution per Unit across scenarios under matching definitions.
How it works
Subtract variable unit cost from unit price, divide by price for the ratio, and multiply by units sold for total contribution. Negative contribution is a meaningful result and is not clamped to zero.
Worked example
50 − 30 = 20 contribution per unit; 100 units contribute 2,000, or 40% of revenue. Enter unit selling price 50 currency/unit, variable cost per unit 30 currency/unit, units sold 100 units. The independently worked result is contribution per unit 20 currency/unit; contribution margin ratio 40 %; total contribution 2000 currency. Compare this example with your reporting definitions before substituting your own figures.
FAQ
What does a negative contribution mean?
Under the entered constant-cost assumptions, each additional unit adds a loss before fixed costs. The calculator retains the negative result instead of hiding it behind zero.
Is total contribution the same as operating profit?
No. Operating profit also subtracts included fixed costs. Contribution describes the amount available for those fixed costs and then any remaining profit.