Confidence Interval Calculator
Calculate the confidence interval for a sample mean.
Result
Results are estimates for general information only and are not professional advice.
Confidence intervals
A confidence interval gives a range that likely contains the true population mean. Using the mean, standard deviation, sample size and confidence level, this calculator finds the margin of error and the interval bounds.
Frequently Asked Questions
What is the Confidence Interval Calculator?
Calculate the confidence interval for a sample mean. It runs instantly in your browser and is completely free.
Is the Confidence Interval Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Confidence Interval Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.