Confidence Calculator
Wilson 95% intervals on any share, with the sample size you would need to halve the uncertainty.
1 min · free · no account
Confidence level
31.0%
±5.2 points at 95%, n = 300
Lower bound
26.0%
Upper bound
36.4%
To halve the interval
n = 1,237
Publishable. Print it as 31.0% ±5.2 with n = 300 beside it, and the figure holds up under questioning.
This is the Wilson score interval, the same computation the Yves console prints beside every headline share. It behaves properly at small sample sizes and near 0% or 100%, where the textbook normal approximation falls apart.
The console greys out any cell under twenty and prints the sample size beside every figure, which is how a published number survives its first hostile question.
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These tools use the same logic
that runs in production.
Start a trial and point them at your own corpus instead of a sample.