Website Conversion Lift Calculator
Conversion lift compares two conversion rates rather than just comparing raw conversion counts. The absolute difference is reported in percentage points; the relative lift scales that difference by the baseline rate.
How to use this calculator
- Use the same conversion event and eligibility window for both cohorts.
- Check that units, denominator definitions and time periods are consistent before comparing scenarios.
- Run a second scenario when an assumption is uncertain.
Formula used by website conversion lift calculator calculator
Baseline and variant rates = conversions / eligible visitors; absolute lift = variant rate − baseline rate; relative lift = absolute lift / baseline rate.
- Baseline and variant rates = conversions / eligible visitors; absolute lift = variant rate − baseline rate; relative lift = absolute lift / baseline rate.
- It does not calculate statistical significance or correct for experiment design issues. Avoid declaring a winner from the descriptive lift alone.
- The tool performs arithmetic on the values entered and does not validate assumptions against outside records.
Worked examples
Worked example
Baseline 350/10,000 = 3.5%; variant 392/9,800 = 4.0%.
Absolute difference = +0.5 percentage points; relative lift ≈ 14.29%.
The result describes the observed difference between the two entered cohorts.
Understanding the result
Conversion lift compares two conversion rates rather than just comparing raw conversion counts. The absolute difference is reported in percentage points; the relative lift scales that difference by the baseline rate.
It does not calculate statistical significance or correct for experiment design issues. Avoid declaring a winner from the descriptive lift alone.
Important notes
It does not calculate statistical significance or correct for experiment design issues. Avoid declaring a winner from the descriptive lift alone.
Treat this output as an estimate tied to the stated inputs. For regulated, safety-critical, tax or professional decisions, verify applicable official guidance and specifications.
Frequently asked questions
What is the difference between percent and percentage points?
A move from 3.5% to 4.0% is +0.5 percentage points and about +14.29% relative lift.
Does a positive lift prove a better variant?
No. Estimate uncertainty and validate the experiment design before making a decision.
How should I interpret the result?
It does not calculate statistical significance or correct for experiment design issues. Avoid declaring a winner from the descriptive lift alone.
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Tools related to Website Conversion Lift Calculator
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.