CRO & Experimentation
A/B Test Significance Calculator
Did your test actually win?
Calculate statistical significance and relative lift between control and variant. Don't ship changes based on noise.
Inputs
Adjust to model your scenario
12,000
420
12,000
492
Statistical confidence
99.9%
99.9% confidence — variant is a statistically significant winner. Ship it.
Relative lift
17.1%
Absolute lift (pp)
0.60%
Control rate
3.50%
Variant rate
4.10%
Formula
z = (p₂ − p₁) ÷ √(p̄(1−p̄)(1/n₁ + 1/n₂)); confidence = 1 − p-value
Related tools
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