Free return on ad spend calculator
ROAS Calculator for Return on Ad Spend
Calculate ROAS by dividing attributed sales by ad spend from the same campaign period, then see the result as one multiplier and percentage.
Divide attributed sales by ad spend.
Use ad spend and attributed sales from the same campaign period. ROAS equals attributed sales divided by ad spend. The calculator shows that one result as a multiplier and a percentage.
The ratio answers how much attributed sales correspond to each dollar of ad spend under the attribution you entered.
Browser-local ROAS calculation
Use one campaign period and one attribution scope.
Enter ad spend and attributed sales from the same period. The calculator uses only those entries and does not fetch, save, or send them.
Calculated result
Enter valid inputs to calculate ROAS.
ROAS will appear as one multiplier and one percentage.
Want to review the period, spend scope, and attribution assumptions? Your entries and result are not included.
One period, one attribution scope, one ratio.
Keep both inputs on the same campaign period and attribution basis. The calculator rounds the ratio half up to one basis point, then derives both displayed forms from that result.
- Ad spend and attributed sales use the same campaign period. Both values cover the same start and end dates before the ratio is calculated.
- The attribution rule is written down. The included channels, conversion event, and attribution window are defined for later comparisons.
Set one period and attribution scope
Use the same campaign period and written attribution rule for ad spend and attributed sales.
Divide attributed sales by ad spend
Divide attributed sales by ad spend and read the same result as a multiplier and percentage.
A precise ratio does not make attribution certain.
The result does not account for product costs, fees, overhead, refunds, attribution uncertainty, or profit. It does not verify whether the attributed sales were incremental.
Foundable supplies no benchmark, target, grade, or forecast. Compare periods only when their spend and attribution scope match.
Answers to common return on ad spend questions.
How do I calculate ROAS?
Foundable's ROAS Calculator divides sales attributed to one campaign period by ad spend from the same period. The result is attributed sales per dollar of ad spend. It does not account for product costs, fees, overhead, refunds, attribution uncertainty, or profit, and it supplies no benchmark or forecast.
What does a ROAS result mean?
The multiplier shows attributed sales per dollar of ad spend. The percentage expresses that same ratio multiplied by 100. Both come from the same entered period and attribution scope.
Does ROAS establish marketing ROI or profit?
No. ROAS compares attributed sales with ad spend. It does not subtract product costs, fees, overhead, refunds, or other costs, and attribution does not prove that the sales were incremental.