Confidence Interval for a Mean
Calculate Confidence Interval for a Mean instantly. Free online calculator with the exact formula, a worked example, and metric units. No signup required.
Confidence Interval for a Mean
Mean
σ
n
CI95% half-width
5.3677
More about: Confidence Interval for a Mean
What it calculates
The “Confidence Interval for a Mean” calculator computes CI95% half-width from 3 parameters: mean, σ, n.
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters Mean = 100, σ = 15, n = 30 the result is 5.37 (CI: [94,63, 105,37]).
How to use
- Enter mean, σ and n — each field above is adjustable with a slider.
- CI95% half-width is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Confidence Interval for a Mean calculated?
The Confidence Interval for a Mean calculator computes CI95% half-width from mean, σ, n. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Confidence Interval for a Mean calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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