ROAS calculator
Revenue ROAS and advertising return with the supplied margin.
Fill in the fields and the result will appear here automatically.
ROAS divides revenue attributed to advertising by advertising spend. Revenue is not profit: the supplied margin specifies the share remaining after included costs before advertising. The calculator subtracts ad spend from that amount and finds the revenue needed to cover it. The remainder is not net profit when overhead, taxes or other costs remain outside the model.
How it works
Formula and logic
Let R be revenue, C > 0 ad spend and m the margin share. ROAS = R/C; percentage ROAS = 100R/C. Amount before ads = Rm; remainder after ads = Rm − C; return on ad spend = 100(Rm/C − 1). With m > 0, break-even revenue = C/m and break-even ROAS = 1/m. At m = 0 there is no finite threshold. This return uses advertising as its denominator, rather than all costs required for accounting ROI.
Example
Revenue 480,000 monetary units, ad spend 120,000 and margin 40% give ROAS 4.00×, amount before ads 192,000, remainder 72,000 and ad-spend return 60.00%. Break-even revenue 300,000 corresponds to ROAS 2.50×. Revenue 120,000 at that margin gives remainder −72,000 and return −60%. Margin 0% gives remainder −120,000 with no finite break-even revenue.
Fields and units
- Revenue — $
- Ad spend — $
- Margin before ads, % — unitless
How to use
- — Enter nonnegative revenue and positive ad spend with a matched period and attribution window.
- — Supply a margin before advertising between 0 and 100%. Avoid counting the same advertising cost inside the margin and again as spend.
- — Use a consistent revenue basis for refunds and taxes.
- — Use one currency throughout. Review overhead and cash timing separately.
Method and limitations
- Calculation method
- Formula and logic
- Data or methodology source
- Google Ads: conversion value relative to advertising spend Google Ads: complete cost basis in the ROI example
- Limitation
- Attributed-revenue model with a margin before advertising. Unincluded overhead, taxes and time value remain outside; the remainder is not net profit or full ROI.
FAQ
Does ROAS 4× imply a three-hundred-percent return?
Only with margin 100% before ads and this simplified denominator. At margin 40%, the ad-spend return here is 60%. A full ROI needs the complete cost basis.
Which margin belongs before the advertising deduction?
The revenue share left after costs included before ads. Document that basis in your report. If advertising has already reduced the margin, subtracting it again would double-count the cost.
Why can ROAS above one still leave a negative remainder?
Production and other included costs reduce the revenue available to pay for ads. At margin 25%, ROAS 4× is needed just to cover advertising; ROAS above one alone is insufficient.
Why is there no break-even revenue at zero margin?
No revenue amount leaves money for ads under that assumption. The remainder is minus ad spend and the return is −100%; a finite covering revenue cannot be calculated.
Can ROAS compare campaigns with different attribution windows?
Align windows, channels, refunds and revenue allocation first. A high ROAS does not prove every sale was caused by advertising or promise the same return after increasing the budget.