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ROAS vs ROI: what is the difference

2026-05-19 15:36 · Paid Marketing

ROAS and ROI answer different campaign questions. This guide explains the difference and when each metric is more useful.

ROAS and ROI are related, but they do not answer the same question.

ROAS measures revenue compared with ad spend. The formula is revenue from ads divided by ad spend. It is useful when you want to compare campaign efficiency across ad sets, channels, or creative tests.

ROI measures profit compared with investment. A basic marketing ROI formula uses net return divided by investment. It is useful when you want to know whether a campaign created business value after costs.

The important difference is that ROAS looks at revenue, while ROI looks at profit or net return. A campaign can show 4.00x ROAS and still have poor ROI if margins are thin, shipping is expensive, or discounts are deep.

Use ROAS when you are optimizing paid media inside an ad account. Use ROI when you are judging whether the campaign is worth the total business investment.

A practical workflow is to start with the ROAS Calculator at /tools/roas-calculator, then use the ROI Calculator when you are ready to include cost and profit assumptions. CPC and CPM can help explain why ROAS changed, because they show whether traffic or impressions became more expensive.