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Free confidence interval calculator

Free confidence interval calculator

Free confidence interval calculator

See the true range behind your results

See the true range behind your results

Instantly calculate the confidence interval around a proportion or mean. Know exactly how much your survey result could vary in the real world.

Instantly calculate the confidence interval around a proportion or mean. Know exactly how much your survey result could vary in the real world.

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PROPORTION CONFIDENCE INTERVAL
53.21% – 66.79%
95% confidence · z = 1.96 · p̂ = 60.00%
60.0%
0%100%
HOW TO READ IT

Intervals in plain language

1
If you repeated your survey many times, 95% of those intervals would capture the true value.
2
Narrower intervals come from larger samples or accepting lower confidence.
3
Use the proportion tab for yes/no results (e.g. satisfaction %). Use mean for average scores (e.g. 1–5 ratings).

The interval shows where the true population value likely sits. Wider intervals mean more uncertainty — usually caused by smaller samples or lower confidence levels.

The interval shows where the true population value likely sits. Wider intervals mean more uncertainty — usually caused by smaller samples or lower confidence levels.

Developed By:

2026 BSure © All Rights Reserved

Licensed by the Communications, Space & Technology Commission

Developed By:

2026 BSure © All Rights Reserved

Licensed by the Communications, Space & Technology Commission