A/B Test Sample Size Calculator

Estimate how many responses per variant you need before declaring a form A/B test winner.

Baseline completion rate (%)

Control variant completion rate.

Minimum detectable lift (pp)

Absolute lift you want to detect, e.g. 5 = 45% → 50%.

Confidence level

Statistical power

Number of variants

Per variant

1,563

Total completions

3,126

At 95% confidence and 80% power, you need ~1,563 completions per variant to detect a 5pp lift from 45%.

Next step

Run form A/B tests natively in Solid Forms Pro.