Cost Calculator AI
Business & StartupCost-Volume-Profit

Contribution Margin Calculator

Calculate dollar contribution margin, contribution margin ratio (CMR), and variable expense ratios to measure how much sales revenue contributes to covering fixed overhead.

Revenue & Variable Expense Balance

Contribution Margin (CM) Formulas

Contribution Margin = Revenue - Variable Costs; Contribution Margin Ratio (CMR) % = (Contribution Margin / Revenue) × 100; Net Income = CM - Fixed Costs
  • Contribution Margin ($): Dollars remaining from revenue to service fixed costs and generate bottom-line profit.
  • CMR %: Percentage of every revenue dollar available to cover fixed overhead.

Step-by-Step Worked Example

Scenario: A company with $250,000 revenue, $100,000 variable costs, and $80,000 fixed costs

Calculation Steps:

  1. Total Contribution Margin = $250,000 - $100,000 = $150,000
  2. Contribution Margin Ratio (CMR) = ($150,000 / $250,000) × 100 = 60.0%
  3. Variable Cost Ratio = ($100,000 / $250,000) × 100 = 40.0%
  4. Net Operating Income = $150,000 - $80,000 = $70,000
Result: Total contribution margin is $150,000 (60.0% CMR), generating $70,000 in net operating profit after paying $80,000 in fixed overhead.

How to Use This Calculator

  1. 1Enter total sales revenue for the evaluation period.
  2. 2Input total variable costs (raw materials, production labor, merchant fees, shipping).
  3. 3Optionally enter total fixed expenses to calculate net operating income.

Assumptions & Limitations

  • Costs are strictly segregated into fixed and variable categories without semi-variable ambiguity.

Frequently Asked Questions

Why is Contribution Margin Ratio (CMR) crucial for business decisions?

CMR tells you how much additional profit every new dollar of sales produces. If your CMR is 60%, adding $10,000 in revenue immediately drops $6,000 directly to net profit once fixed costs are covered.

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