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Confidence Intervals

Proportion Confidence Interval Calculator

Use this calculator to compute the confidence interval for a single population proportion. Enter summary or count data and click Calculate to get the lower and upper confidence limits, margin of error, and a clear step-by-step solution.

Enter the proportion as a decimal. For example, enter 0.58 for 58%.
Common confidence levels are 90%, 95%, and 99%.
Enter the number of observations with the outcome of interest.
Common confidence levels are 90%, 95%, and 99%.

Need to calculate only the sampling margin? Use our Margin of Error Calculator .

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Mburu, J.. (2026, August 23). Proportion Confidence Interval Calculator. StatCalc.net. Retrieved August 23, 2026, from https://statcalc.net/proportion-confidence-interval-calculator/
Joseph Mburu

About This Calculator

Prepared by Joseph Mburu · Updated on

Joseph is an applied statistician and data analyst with over 6 years of experience helping students, researchers, and professionals solve statistics and data analysis problems. He holds a degree in Applied Statistics and a Master’s degree in Data…

We aim to keep our calculators accurate, easy to use, and helpful for learning. Always check that your inputs match the assumptions of the method you are using.