Free Amazon ROAS Calculator

Find your Return on Ad Spend (ROAS) ratio.

ROAS and ACoS measure the same underlying relationship from opposite directions — ROAS is a ratio (higher is better), ACoS is a percentage (lower is better). Some sellers find ROAS more intuitive since "4x ROAS" reads more naturally than "25% ACoS" even though they mean exactly the same thing.

Worked Example

Example: $150 ad spend generates $750 in revenue. ROAS = $750 / $150 = 5.0x — every $1 spent on ads returned $5 in revenue.

Formula

ROAS = Ad-Attributed Revenue / Ad Spend
ACoS % = 1 / ROAS × 100 (they're mathematically the same relationship)

Frequently Asked Questions

How is ROAS different from ACoS?
They express the same ratio in opposite directions — ROAS is revenue/spend (higher = better), ACoS is spend/revenue as a percentage (lower = better).