Metrics · Ops · Product · Quarterly · % · Updated 2026-07-21

What is Experiment Win Rate?

Short answer: The percentage of A/B tests or experiments that produce a statistically significant positive result.

Definition

The percentage of A/B tests or experiments that produce a statistically significant positive result.

Formula

Experiments with a significant positive result / Total experiments run x 100

How to measure

Track the outcome of every completed experiment and divide the count of statistically significant wins by the total number run.

Why track it

Experiment win rate, tracked alongside velocity, shows whether a growth team's hypotheses are well-targeted or if they're running too many low-conviction tests.

Example

A growth team's experiment win rate holds steady at 30%, considered healthy since most credible experimentation programs win on a minority of tests.

FAQ

What is Experiment Win Rate?
The percentage of A/B tests or experiments that produce a statistically significant positive result.
How do you calculate Experiment Win Rate?
Experiments with a significant positive result / Total experiments run x 100
Why track Experiment Win Rate?
Experiment win rate, tracked alongside velocity, shows whether a growth team's hypotheses are well-targeted or if they're running too many low-conviction tests.
What is Experiment Win Rate? Definition, formula, and growth use · Cofounderbase