Test Size Calculator
Find out how many beta testers you actually need, with a clear range and the reasoning behind it.
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About Test Size Calculator
Test Size Calculator is a beta tester calculator that turns guesswork into a number you can defend. You enter a few details about your product and your audience, and it returns a recommended test size, a workable range, and a confidence level. A plain-English explanation shows exactly how it reached the recommendation, so you can walk a stakeholder through it without hand-waving.
Instead of leaning on a flat rule of thumb or a gut estimate, you start your beta with a number you can stand behind. Size the test once, recruit the right amount, and spend your energy on feedback instead of second-guessing.
How It Helps
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- Stop guessing: Replace rules of thumb with a number built from your product and your audience.
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- Defend your plan: Show stakeholders the range, confidence level, and reasoning behind your test size.
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- Recruit the right amount: Avoid over-recruiting or running a test too small to trust.
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- Start faster: Get a workable recommendation in under a minute, with no sign-in.
App Features
Defensible test size recommendation
Recommended range, not a single guess
Confidence level for every result
Simple product and audience inputs
Instant recalculation as inputs change
No sign-in required
