Free marketing tool
Marginal ROAS Calculator
Marginal ROAS measures the return generated by the next unit of marketing spend, rather than the average return from all historical spend.
Calculate your marginal ROAS
Enter comparable spend and revenue figures. Currency is not part of the calculation, so use the same currency for every field.
What is Marginal ROAS?
Current ROAS looks at all revenue relative to all spend. Marginal ROAS asks a forward-looking question: what revenue is associated with the next increase in spend? That distinction matters because additional investment can produce a different return as a channel approaches saturation.
Current ROAS vs Marginal ROAS
For example, if current spend is ₹1,000 and current revenue is ₹4,000, current ROAS is 4.00x. If projected spend is ₹1,200 and projected revenue is ₹4,300, the additional ₹200 produces ₹300 of revenue, so marginal ROAS is 1.50x.
Frequently asked questions
What if projected spend is lower?
This calculator focuses on incremental spend, so projected spend must be greater than current spend.
Does a high marginal ROAS guarantee profit?
No. Profitability depends on contribution margin, operating costs and whether the revenue is genuinely incremental.
Ready to optimize the full budget?
Compare channels, model saturation and understand where the next ₹1 of budget should go.