<b>Q: My 'user key event rate' looks way off versus my real conversion math. What's the denominator?</b>
A: GA4's rate metrics use a denominator you may not expect.
— <b>Session key event rate</b> = sessions with the event ÷ total sessions.
— <b>User key event rate</b> = users who triggered it ÷ total active users.
If you're mentally computing 'orders ÷ sessions' but GA4 shows the user-based rate, the numbers won't line up.
Build your own clean ratio in an Exploration: add Sessions and Key events as values, then a calculated comparison, so you control the denominator instead of guessing which built-in metric you're reading.
TL;DR: Check whether you're reading the session-based or user-based rate; the denominators differ. Build your own in Explorations.
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<b>Q: My 'user key event rate' looks way off versus my real conversion math. What's the denominator?</b>
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