Sample-size calculator
How much traffic and time do you need to reach significance?
Type in your daily visitors and baseline conversion rate and we'll estimate the per-arm sample size and days to statistical significance — the same maths we use inside the dashboard, exposed to everyone.
- Two-tailed α = 0.05
- Power = 80%
- No login required
Free at every tier — the same calculator inside the dashboard.
At ~5,000 daily visitors and a 3.00% baseline conversion rate, you'll need ~53,148 visitors per arm and about 32 days — we recommend planning ~1 month of runtime for typical experiments, then Variantix will call a winner as soon as statistical confidence is reached, to detect a 10% relative lift.
We recommend planning ~1 month of runtime for typical experiments — Variantix will call a winner as soon as the test reaches statistical confidence.
For testing depth like this, our Moderate tier would fit best — but you can start free.
Designed for growing teams ready for multiple simultaneous experiments — autonomous traffic split, significance testing, and a weekly results digest.
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Or email us directly at variantix@polsia.app