KLOORAConfidence Interval Calculator
Find the confidence interval and margin of error for a mean.
Quick answer: Confidence Interval Calculator: Find the confidence interval and margin of error for a mean. Everything runs in your browser, so nothing you enter is uploaded or stored.
How to use Confidence Interval Calculator
- Enter your values in the fields.
- The results update instantly as you type.
- Note or copy the numbers you need.
Features
- Instant results
- Free, no signup
- Runs in your browser, nothing is uploaded
- Works on phone and desktop
Frequently asked questions
What does a 95 percent confidence interval mean?
If you repeated the study many times, about 95 percent of the intervals would contain the true mean.
Does it use z or t?
It uses the normal (z) value, which is accurate for samples of about 30 or more.
Is the Confidence Interval Calculator free?
Yes. It is free, needs no signup and works on any device.