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
Test budget = variants × assumed CPA × conversions per variant. Daily budget = test budget ÷ days.
Worked example
Four variants at 30 CPA and 20 conversions each imply a 2,400 test envelope, or 171.43 per day over 14 days.
What the result can tell you
This is a spend scenario, not a statistical sample-size calculation or a promise of conversions. Set the experiment design and decision criteria separately.
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.