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A/B Testing Calculators

Statistical Significance Calculator

Is your A/B test result significant? Two-proportion z-test with p-value, confidence and relative uplift.

Enter values

Results update as you type.

Result

Result

Significant (p = 0.0159)

Conversion A
4%
Conversion B
5%
Relative uplift
25%
Confidence
98.413%
z-score
2.4119

About the Statistical Significance Calculator

Is your A/B test result significant? Two-proportion z-test with p-value, confidence and relative uplift.

Also known as: ab test significance, p value calculator, split test calculator, conversion significance, two proportion z test.

How to use this calculator

  1. Enter visitors a, conversions a, visitors b, conversions b.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

z = (p̂B − p̂A) / √(p̂(1 − p̂)(1/nA + 1/nB))

Worked example

Using the values pre-filled in the calculator above:

  • Visitors A = 5,000
  • Conversions A = 200
  • Visitors B = 5,000
  • Conversions B = 250

the calculator returns:

  • Result: Significant (p = 0.0159)
  • Conversion A: 4%
  • Conversion B: 5%
  • Relative uplift: 25%