E-commerce ROAS: How to Calculate and Improve It 2026

ROAS (return on ad spend) is the most important number in your store ads, yet it is often misunderstood. This guide simplifies it and shows how to improve it.

What is ROAS?

Simply: ad revenue divided by ad cost. Spent 100 and made 400? Your return is 4x. But note: a profitable return depends on your margin, so a low-margin product needs a higher return to profit.

What is a good number?

There is no magic number. Calculate your break-even from your margin, and any return above it is profit. Fashion and beauty often tolerate a lower return, while low-margin products need higher.

How to actually raise ROAS

1) Improve on-store conversion, as every page improvement raises return with no extra spend. 2) Dynamic catalog and retargeting. 3) Stronger ad creative (UGC stops the scroll). 4) Exclude unprofitable audiences. 5) Raise order value with bundles.

A common mistake

Chasing a very high return shrinks your sales volume. Sometimes a lower return at higher volume gives more total profit. Balance return and volume by your goals.

We calculate it for you

We tune your campaigns around a real profitable return with transparent reports. See store ad management or book a free consultation.