What is ROAS and why does it matter?
ROAS stands for Return On Ad Spend: the revenue generated for every unit of currency spent on advertising. Spend 100, generate 400 in sales, and your ROAS is 4x. But the number alone can mislead: a 4x ROAS is very profitable for a 50%-margin product and a loss for a 20%-margin product. That is why this tool also calculates your break-even ROAS and net profit after ads.
How to use it
- Enter your ad spend for a period (a day, a week, a campaign).
- Enter the revenue from ads as reported by the ad platform or your store.
- Enter the number of orders to get CPA and average order value.
- Enter your gross profit margin before ad costs (use our profit margin calculator if needed).
The metrics explained
- ROAS = revenue ÷ ad spend.
- Break-even ROAS = 1 ÷ margin. With a 40% margin you need at least 2.5x to avoid losing money.
- ACoS = spend ÷ revenue × 100 — the inverse of ROAS, used in Amazon Ads.
- CPA = spend ÷ orders — what you pay to win one order.
- Max affordable CPA = average order value × margin. Anything higher loses money on each order.
- Net profit after ads = revenue × margin − spend.
How to improve ROAS
- Target a narrower, more relevant audience.
- Improve your product page — clear photos, persuasive copy and genuine reviews raise conversion.
- Increase average order value with bundles and cross-sells.
- Pause ads and keywords that spend without selling.
- Retarget visitors who showed interest but did not buy.
An important caveat
Ad platforms may take credit for sales that would have happened anyway. Always compare ad reports with your store’s total sales and watch net profit, not revenue alone. The calculator does not include fixed costs such as subscriptions or salaries, so keep a safety margin above break-even.