Calculating your contribution margin per unit is straightforward once you know the Contribution Margin formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Contribution Margin Calculator.
What is Contribution Margin?
The Contribution Margin calculation tells you your contribution margin per unit from a few simple inputs. The figure you are solving for here is the contribution margin per unit, expressed in INR.
The Contribution Margin formula
The core formula is:
Contribution margin per unit = Selling price per unit - Variable cost per unitHere is what each input means:
- Selling price per unit — a money amount. Example: ₹500.
- Variable cost per unit — a money amount. Example: ₹300.
How to calculate it step by step
- Write down the selling price per unit (for example, ₹500).
- Write down the variable cost per unit (for example, ₹300).
- Apply the formula above to get your contribution margin per unit.
- Double-check the result with the Contribution Margin Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Selling price per unit | ₹500 |
| Variable cost per unit | ₹300 |
| Contribution margin per unit | ₹200.00 |
| Contribution margin ratio | 40.00% |
With selling price per unit of ₹500 and variable cost per unit of ₹300, the contribution margin per unit works out to ₹200.00.
Example 2
With selling price per unit of ₹1,000 and variable cost per unit of ₹300, the contribution margin per unit works out to ₹700.00.
| Result | Value |
|---|---|
| Contribution margin per unit | ₹700.00 |
| Contribution margin ratio | 70.00% |
Example 3
With selling price per unit of ₹250 and variable cost per unit of ₹300, the contribution margin per unit works out to -₹50.00.
| Result | Value |
|---|---|
| Contribution margin per unit | -₹50.00 |
| Contribution margin ratio | -20.00% |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Contribution Margin Calculator does it instantly, for free, with the formula and a worked example built in.
Related calculators
Continue exploring business calculators with these tools: Discount Calculator, Price Elasticity of Demand Calculator, Profit Margin Calculator, Gross Profit Calculator, ROI Calculator.