A/B Test Sample Size
Calculate A/B Test Sample Size instantly. Free online calculator with the exact formula, a worked example, and metric units. No signup required.
A/B Test Sample Size
Base conversion
MDE (rel.)
α
Sample per group
14,735
More about: A/B Test Sample Size
What it calculates
The “A/B Test Sample Size” calculator computes Sample per group from 3 parameters: base conversion, mde (rel.), α.
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters Base conversion = 0.1, MDE (rel.) = 0.1, α = 0.05 the result is 14,735 (p₁=0,1, p₂=0,11).
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.