What is contribution margin?

Contribution margin (CM) is the selling price minus variable cost per unit. It represents the portion of each sale that covers fixed costs and contributes to profit. Once total fixed costs are covered, each unit of CM becomes profit.

How is the contribution margin ratio calculated?

CM ratio = (Contribution Margin per Unit) ÷ (Selling Price per Unit) × 100. It shows what percentage of each dollar of revenue goes toward covering fixed costs and profit. A 40% CM ratio means $0.40 of every $1 in sales covers fixed costs and profit.

How is the break-even point calculated?

Break-even units = Fixed Costs ÷ Contribution Margin per Unit. Break-even sales dollars = Fixed Costs ÷ CM Ratio. At break-even, total revenue equals total costs and profit is exactly zero.

What counts as a variable cost?

Variable costs change in proportion to production or sales volume. Common examples include direct materials, direct labor, sales commissions, packaging, and shipping. Fixed costs (rent, insurance, salaries) stay constant regardless of volume and are entered separately.

What is a good contribution margin ratio?

It varies by industry. Software and digital products often have CM ratios above 70–80% since variable costs are low. Manufacturing and retail typically see 20–50%. Compare against your industry benchmark and track changes over time rather than chasing a universal target.

Contribution Margin Calculator

Name: Contribution Margin Calculator
Availability: InStock
Author: Nham Vu

Enter selling price, variable cost per unit, and fixed costs to instantly calculate contribution margin, CM ratio, and break-even point.

Inputs

Selling Price per Unit ($)

Variable Cost per Unit ($)

Total Fixed Costs ($)

Target Profit ($) (optional)

Enter your values and click Calculate to see the results.

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Summary

Enter selling price, variable cost per unit, and fixed costs to instantly calculate contribution margin, CM ratio, and break-even point.

How it works

Enter the selling price per unit (the amount customers pay).
Enter the variable cost per unit (direct materials, labor, commissions, etc.).
Enter total fixed costs for the period (rent, salaries, depreciation, etc.).
Optionally enter a target profit to see the units needed to reach that goal.
The calculator outputs contribution margin per unit, CM ratio, and break-even in units and dollars.

Use cases

Determine how many units must be sold before the business turns a profit.
Evaluate pricing changes by seeing how contribution margin shifts.
Compare product lines to find which contributes most to covering fixed costs.
Set sales targets to hit a specific profit goal.
Assess impact of variable cost increases (e.g. raw material price hikes) on break-even.
Support budget planning and CVP (cost-volume-profit) analysis.

Frequently Asked Questions

Last updated: 2026-07-22 · Reviewed by Nham Vu