Contribution Margin Ratio Calculator
Calculate Contribution Margin Ratio step by step: Contribution margin ratio = (sales − variable costs) ÷ sales × 100.
In short
Formula: Contribution margin ratio = (sales − variable costs) ÷ sales × 100.
What this calculator does
Calculate Contribution Margin Ratio step by step: Contribution margin ratio = (sales − variable costs) ÷ sales × 100. Worked example, questions and limitations included.
Use it to turn Currency (symbol only, never converted), Sales revenue, Total variable costs into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this accounting & costing calculation.
Inputs and what they mean
- Currency (symbol only, never converted)
- — choice value.
- Sales revenue
- — number value.
- Total variable costs
- — number value.
How to use it
- Enter each value in the unit shown next to the box (use the unit converter first if your numbers are in other units).
- Check the breakdown to see every intermediate step.
- Read the limitations before relying on the result.
Formula
Cost-volume-profit definition from OpenStax Principles of Managerial Accounting.
Contribution margin ratio + variable cost ratio = 100%.
Fixed costs are not subtracted.
Contribution margin ratio = (sales − variable costs) ÷ sales × 100.
Inputs used: Currency (symbol only, never converted), Sales revenue, Total variable costs.
Worked example
A product line
- Contribution = 200,000 − 120,000 = $80,000.
- 80,000 ÷ 200,000 = 40%.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Assumes costs split cleanly into fixed and variable.
- Assumes a constant sales mix.
- Results are educational estimates built only from the figures you enter. They are not personalised investment, tax, legal or accounting advice. Rates, growth and discount assumptions are always yours to choose.
- The result depends on the values you enter for this contribution margin ratio calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Common questions
How is this different from gross margin?
Gross margin subtracts COGS, which can include fixed production overhead. Contribution margin subtracts only variable costs, including variable selling costs.
What can I do with the ratio?
Divide fixed costs by it to get break-even revenue — see the break-even revenue calculator. Check the formula, example, and limitations on this page before using the result for a real accounting & costing decision.
Per unit or total?
Either. The ratio is the same if price and variable cost per unit are constant.
How do I use the Contribution Margin Ratio Calculator?
Enter the required values for Currency (symbol only, never converted), Sales revenue, Total variable costs. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Contribution Margin Ratio Calculator use?
Contribution margin ratio = (sales − variable costs) ÷ sales × 100. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Can the Contribution Margin Ratio Calculator be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
Related tools
Calculate COGS step by step: COGS = beginning inventory + purchases − ending inventory.
Calculate Gross Profit step by step: Gross profit = net revenue − cost of goods sold.
Calculate Gross Margin step by step: Gross margin % = (net revenue − COGS) ÷ net revenue × 100.
Calculate Break-Even Revenue step by step: Break-even revenue = fixed costs ÷ contribution margin ratio.
Calculate Target Profit step by step: Target units = (fixed costs + target profit) ÷ (price − variable cost per unit), rounded up to a whole unit.
Calculate Margin of Safety step by step: Margin of safety % = (actual sales − break-even sales) ÷ actual sales × 100.