CRO
MDE
Minimum Detectable Effect
The smallest lift a test is designed to detect with statistical confidence.
Definition
What it actually means.
MDE drives required sample size — smaller MDE means more visitors needed. For mature funnels, 5–10% relative MDE is typical. For early-stage, 15–25%.
Related calculator
A/B Test Sample Size Calculator
How many visitors before your test is conclusive.
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