About the A/B Test Lift Calculator
Relative and absolute lift between control and variant conversion rates, plus projected extra conversions.
Also known as: conversion lift, relative improvement, absolute improvement, uplift calculator, variant lift.
How to use this calculator
- Enter control conversion rate, variant conversion rate, monthly visitors (optional).
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Relative lift = (B − A) / A × 100
Worked example
Using the values pre-filled in the calculator above:
- Control conversion rate = 3.2 %
- Variant conversion rate = 3.8 %
- Monthly visitors (optional) = 100,000
the calculator returns:
- Relative lift: 18.75%
- Absolute lift: 0.6 percentage points
- Extra conversions / month: 600