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ROAS Calculator

Compare ad-attributed revenue with spend and a contribution-margin break-even point.

Your numbers

Make it your own
Updates as you type
Return on ad spend
4×

Calculated from your inputs · rounded for display

ROAS400%
Break-even ROAS2.5×
Contribution after ad spend$600.00

Attributed revenue is user-entered. The margin must cover variable costs before advertising. This is not net profit: fixed overhead and taxes are excluded.

Your calculation, step by step

No black boxes
  1. ROAS = 4000 ÷ 1000 = 4×.
  2. Break-even ROAS = 1 ÷ (40/100) = 2.5×.
  3. Contribution after ads = revenue × pre-ad contribution margin − ad spend = 600 USD.

What if things were different?

Save up to three scenarios, then change your inputs to compare the possibilities.

How to use this calculator

  1. Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
  2. Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
  3. Copy, share, save, or download your result. Saved inputs stay on this device.

How the calculation works

ROAS = attributed revenue / ad spend; break-even ROAS = 1 / contribution margin

ROAS compares revenue with ad cost, not profit with total business costs. For a meaningful break-even point, enter the contribution margin after variable costs but before advertising. The supporting contribution result subtracts advertising from that amount; fixed overhead remains excluded. Attribution quality depends on the data you enter.

A worked example

$4,000 revenue ÷ $1,000 spend = 4× ROAS. At 40% contribution margin, break-even ROAS is 1 ÷ 0.4 = 2.5×.

Reading your result

Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.

Frequently asked questions

Is ROAS the same as ROI?

No. ROAS uses revenue and advertising spend; ROI uses profit and investment cost.

Does contribution after ads equal net profit?

No. Fixed overhead and taxes are excluded.

Sources & methodology

This calculator uses the mathematical identity and assumptions stated above. No current rates, prices, or external data are loaded. Conversion tools use international unit definitions.

Formula review: October 24, 2026. Read our methodology.