For Online Sellers

ROAS & ACoS Calculator with Break-even for Marketplace Ads

Free tool · Updated October 2, 2026 · By CouponTalk · Reviewed by CouponTalk Expert Reviews on October 2, 2026

Your result

Enter your measurements to see your result.

Quick answer

ROAS is ad sales ÷ ad spend; ACoS is ad spend ÷ ad sales. Your break-even ACoS equals your profit margin before ads, and break-even ROAS is 1 ÷ that margin. With a 25% margin, any campaign above 25% ACoS (below 4× ROAS) loses money on ad-driven orders.

How to use this calculator

Copy ad spend and attributed sales from your ads dashboard.
Enter your profit margin before advertising.
Compare actual ROAS with break-even ROAS.

Fee and rate table

Break-even ad targets by margin
Profit margin before ads	Break-even ACoS	Break-even ROAS
10%	10%	10×
15%	15%	6.67×
20%	20%	5×
25%	25%	4×
30%	30%	3.33×
40%	40%	2.5×
50%	50%	2×

Fees and rates checked on 2 October 2026. Marketplaces revise rate cards often, so confirm current figures in your seller dashboard before you set prices.

Frequently asked questions

What is a good ACoS on Amazon India?

Any ACoS below your profit margin is profitable. Many sellers target 15–30%, but the right number depends on your margin and whether you are launching (higher ACoS is fine) or harvesting profit.

What is TACoS?

Total ACoS: ad spend ÷ total sales (ads + organic). It shows whether ads are growing your overall business.