How to use this tool
Replace the example values with your own inputs. Results update as you type. Keep your measurement period and definitions consistent, then use the result to inform the next question in your advertising review.
The formula
MER = total business revenue ÷ total marketing spend.
Worked example
50,000 total revenue and 10,000 total marketing spend gives a 5.00× MER.
What the result can tell you
MER includes revenue from organic, repeat and paid demand. It is not an incremental return or a way to attribute revenue to a particular campaign.
Is it free, and where do my inputs go?
The tool runs in your browser without an account or an ad-platform connection. Calculation inputs are not sent to WhatWins. If you save a scenario, it stays in this browser on this device.