Return on ad spend calculator
Compare revenue ROAS with the profit each campaign really keeps after product costs, order costs and ad spend. Enter attributed revenue and orders from your own attribution model or ad platform.
Up to 200 campaigns and 100,000 characters, with campaign names of up to 80 characters. Ad spend and revenue from 0 to 1,000,000,000,000, orders up to 1,000,000,000 and margins from 0 to 100 percent with two decimal places. Cost per order up to 1,000,000. Calculated on your device. Download a JSON report and CSV files. One campaign per line: name, ad spend, attributed revenue, then optional orders and gross margin. Write numbers without thousands separators. Up to 100,000 characters. Review the settings before running.
Your result
How to use Return on ad spend calculator
- Paste one campaign per line with its ad spend, attributed revenue and, if you have them, orders and gross margin.
- Enter your gross margin and the shipping and other variable cost per order.
- Calculate and compare each campaign ROAS with its contribution after ads.
- Download the report and the campaign CSV.
Useful next steps
Revenue ROAS
ROAS is attributed revenue divided by ad spend, the definition used in the Google Ads Help page About Target ROAS bidding (retrieved 16 October 2026). A ROAS of 3.20 means 3.20 of attributed revenue for each 1 of ad spend. It says nothing about profit, because that revenue still has to pay for the products and for getting each order to the customer.
Contribution after ads
Contribution before ads is attributed revenue times your gross margin, minus orders times the cost per order, the contribution approach in Marketing Metrics by Farris, Bendle, Pfeifer and Reibstein (2nd edition, Pearson, 2010). Subtracting ad spend gives contribution after ads. In the example, Search generic has a ROAS of 3.20 but loses 29.50: 10,880 times 40% is 4,352.00, minus 151 orders times 6.50, minus 3,400 of ad spend. A campaign breaks even at a ROAS of its revenue divided by its contribution before ads, and contribution per 1 of ad spend is contribution before ads divided by spend.
Attribution is your input
The revenue and orders you enter come from your own attribution model, analytics or ad platform. Platforms often credit the same sale to more than one campaign, so blended totals can overstate revenue, and the calculator does not de-duplicate or attribute sales. Each campaign amount is rounded to the currency decimal places and the totals add the rounded amounts. You can give a campaign its own gross margin in an optional margin column.