# Contribution Margin Calculator

URL: https://speedycalculator.com/calculators/finance/contribution-margin/
Last updated: 2026-10-25

> The contribution margin calculator works out how much each unit sold contributes to covering fixed costs and profit, the contribution margin ratio, total contribution and the profit after fixed costs.

## Inputs

- Selling price per unit
- Variable cost per unit
- Number of units
- Fixed costs

## Results

- Contribution margin per unit
- Contribution margin ratio
- Total contribution margin
- Profit (after fixed costs)
- Break-even units

## Formula

```
Contribution margin per unit = price − variable cost per unit
CM ratio = CM ÷ price
Total contribution = CM × units; profit = total contribution − fixed costs
```

## Explanation

Contribution margin is the money left from each sale after paying the variable costs of producing it. It is the key number for break-even analysis, pricing and deciding which products to push.

### How to use the Contribution Margin Calculator

- **Selling price per unit**
- **Variable cost per unit**
- **Number of units**
- **Fixed costs**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the selling price and variable cost per unit, the number of units and your fixed costs.

### Tips

- Use figures for the same period (a month, a quarter or a year) for every input so ratios compare like with like.
- Track the metric over time – the trend usually tells you more than a single value.
- Compare your result with industry benchmarks, which vary a lot between sectors.
- Treat the result as a starting point for a decision, then check the assumptions behind each input.

### Common mistakes to avoid

- Mixing monthly and yearly numbers in the same calculation.
- Using revenue where the formula needs profit (or the other way round).
- Forgetting hidden costs such as taxes, fees, overheads or your own time.

### Inputs explained

FieldWhat to enterSelling price per unitAmount in your currencyVariable cost per unitAmount in your currencyNumber of unitsA numberFixed costsAmount in your currency

### What each result means

- **Contribution margin per unit** = [Selling price per unit] - [Variable cost per unit]
- **Contribution margin ratio** = ([Selling price per unit] - [Variable cost per unit])÷[Selling price per unit]×100
- **Total contribution margin** = ([Selling price per unit] - [Variable cost per unit])×[Number of units]
- **Profit (after fixed costs)** = [Total contribution margin] - [Fixed costs]
- **Break-even units** = ceil([Fixed costs]÷([Selling price per unit] - [Variable cost per unit]) - 0.000001)

### Example values

How the main result changes when **Selling price per unit** changes and everything else stays at the example values above:

Selling price per unitContribution margin ratio (%)25-2037.520504062.552756010070

## Worked example

Inputs — Selling price per unit: $50; Variable cost per unit: $30; Number of units: 1,000; Fixed costs: $15,000.

Results — Contribution margin per unit = $20.00; **Contribution margin ratio = 40 %**; Total contribution margin = $20,000.00; Profit (after fixed costs) = $5,000.00; Break-even units = 750.

## FAQ

**What is a good contribution margin ratio?**
It depends on the industry; higher ratios leave more to cover fixed costs.

**How is contribution margin different from gross margin?**
Contribution margin subtracts only variable costs; gross margin subtracts all cost of goods sold.

**Can contribution margin be negative?**
Yes, if variable costs exceed the price – each sale then loses money.

**What formula does the Contribution Margin Calculator use?**
Contribution margin per unit = price − variable cost per unit.


## Sources

- [Corporate Finance Institute – financial ratios](https://corporatefinanceinstitute.com/)