A/B Test Calculator
Compute conversion rates, lift, z-score, and p-value for A/B test results.
How to use A/B Test Calculator
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Enter visitors and conversions for your control (Variant A).
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Step 2. Enter the same for your challenger (Variant B).
- 3
Step 3. Pick a confidence level: 90%, 95%, or 99%.
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Step 4. Read the verdict: significant or not, plus lift, z-score, and p-value.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about a/b test calculator.
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