ROAS calculator
Calculate attributed revenue per unit of advertising spend, as a multiple and a percentage.
Enter ad spend and attributed revenue in the same currency. Use revenue from the same campaign scope and attribution window.
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The formula
ROAS = attributed revenue ÷ ad spend
ROAS percentage = ROAS × 100
Worked example · sample data
4,000 in attributed revenue and 1,000 in spend gives 4× ROAS, or 400%.
Before you use the result
ROAS is a revenue return, not profit. It does not deduct product costs, operating costs, refunds or other expenses unless your input revenue already reflects them.
Attributed revenue is not necessarily incremental revenue. A reporting model assigning credit does not prove the ad caused every purchase.
A zero spend denominator makes ROAS undefined. Positive revenue with no ad spend should be reported as counts, not an infinite return.
Reference: Google Ads: ROAS and incremental ROAS