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A/B Test Calculator

Four calculators for the full experimentation lifecycle — from planning your test to reading results.

Conversion Rate Inputs

Control (A)

Visitors

Conversions

Conversion rate: —

Variant (B)

Visitors

Conversions

Conversion rate: —

Confidence threshold ?

Results

Control CR—

Variant CR—

Relative Lift—

P-value—

Confidence—

Z-score—

Test Parameters

Baseline CR (%) ?

Min. detectable effect (%) ?

Statistical confidence

Statistical power ?

Variants (excluding control)

Daily visitors available for test

Results

Sample per arm — visitors

Total visitors needed — visitors

Estimated duration — days

Earliest end date — at current traffic

Where Your Test Stands Now

Baseline CR (%)

MDE (%) ?

Statistical confidence

Statistical power

Variants (excluding control)

Daily visitors in test

Days already running

Visitors accumulated (all arms combined)

Results

Total visitors needed — visitors

Visitors accumulated — visitors

% complete —

Days remaining —

Projected end date —

Progress to required sample —

Input Mode

Upload one CSV per arm. Each row is a transaction or session. We'll compute n, mean, and std deviation from the raw data before running the t-test.

Control (A)

CSV file Choose file…

Variant (B)

CSV file Choose file…

Confidence threshold

Results

Control mean—

Variant mean—

Absolute diff—

Relative lift—

P-value—

Confidence—

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