Blended ROAS Calculator
The figure that reconciles to a bank balance.
Blended ROAS
3.44×
platforms report 3.94×
The platforms claim $9,000 more revenue than actually arrived, because each one credits itself for customers who saw several ads. Blended ROAS is the only figure that reconciles to a bank balance — use channel ROAS to optimise within a channel and blended to decide anything about the business.
How the Blended ROAS Calculator works
Every platform credits itself for customers who saw several ads, so summing reported revenue routinely exceeds total sales. Blended ROAS — actual revenue over actual spend — is the only figure that reconciles to a bank balance, and the gap between it and reported is worth measuring.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
What is blended ROAS?
Total revenue divided by total advertising spend across all channels, using figures from your own accounts rather than platform dashboards.
Why does reported ROAS overstate?
Overlapping attribution. A customer who saw a Meta ad, clicked a Google ad and opened an email is credited to all three, so the sum of channel-reported revenue exceeds what arrived.
Should I stop using channel ROAS?
No — it is the right tool for optimising within a channel. It is the wrong tool for deciding how much of the business to give a channel, which is where blended belongs.
How do I measure incrementality properly?
Geo holdouts or spend-down tests: turn a channel off in a matched region and measure the difference in total revenue. It is disruptive and it is the only method that answers the question.