Tools / ROAS calculator

Amazon ROAS calculator

Enter your ad spend and ad sales to see your ROAS and ACoS. Add your profit margin to see the break-even ROAS your ads need to hit. Free, no signup.

How it works

What is return on ad spend (ROAS)?

ROAS formula

ROAS (return on ad spend) shows how many dollars of ad sales each ad dollar brings in. ROAS = ad sales / ad spend.

How to calculate ROAS

Spend $500 on ads that bring in $2,000 in ad sales and your ROAS is $2,000 / $500 = 4.0. That is the same as a 25% ACoS.

What is a good ROAS

Anything above your break-even ROAS. With a 40% margin before ads, that is 2.5. In our September 2026 benchmarks across 66 ad accounts, the median ACoS was 34.2%, a ROAS of about 2.9.

ACoS	ROAS
10%	10.0
20%	5.0
25%	4.0
33%	3.0
40%	2.5
50%	2.0
75%	1.33
100%	1.0

FAQ

Frequently asked questions

What is ROAS on Amazon?+

ROAS (return on ad spend) shows how many dollars of ad sales you get for every dollar you spend on Amazon ads. A ROAS of 4.0 means $4 in ad sales for every $1 of ad spend.

How do you calculate ROAS?+

ROAS = ad sales / ad spend. Take the attributed sales and the spend for the same campaigns and the same dates. $2,000 in ad sales from $500 in ad spend is a ROAS of 4.0.

What is a good ROAS on Amazon?+

A good ROAS is one above your break-even ROAS, which depends on your margin. With a 40% profit margin before ads, break-even ROAS is 2.5, so anything above 2.5 makes money on ad sales. Across the 66 Amazon ad accounts in our September 2026 benchmarks, the median ACoS was 34.2%, which is a ROAS of about 2.9.

What is break-even ROAS?+

Break-even ROAS = 1 / profit margin before ads. It is the lowest ROAS at which your ads still cover their cost. With a 30% margin you need a ROAS of 3.33. With a 50% margin you need 2.0.

What is the difference between ROAS and ACoS?+

They are the same numbers turned around. ACoS = ad spend / ad sales x 100, ROAS = ad sales / ad spend. A 25% ACoS is a 4.0 ROAS, and a 50% ACoS is a 2.0 ROAS. Amazon reports ACoS, while Google and Meta usually report ROAS.

Does Amazon ROAS include organic sales?+

No. ROAS only counts sales Amazon attributes to your ads (7 days for Sponsored Products, 14 days for Sponsored Brands and Sponsored Display). To see ad spend against all sales, ad and organic, use TACoS.

Free tools