What does the Sample Size Calculator work out?

How many responses a survey needs. It is one of the Math tools on Mondo Knows.

How is the Sample Size Calculator calculated?

You get an instant answer with the working shown underneath.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Sample Size Calculator

How many responses a survey needs. Use the free sample size calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Population size

Margin of error

Confidence level

Mondo says

Required sample size

370

Without finite population correction385

Population10000

Sample Size Calculator: common questions

What does the Sample Size Calculator work out?: How many responses a survey needs. It is one of the Math tools on Mondo Knows.
How is the Sample Size Calculator calculated?: You get an instant answer with the working shown underneath.
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Confidence Interval CalculatorRange that likely contains the true mean.➗ Math Percentage CalculatorEvery common percentage question in one place.➗ Math Scientific Notation CalculatorConvert to and from scientific notation.➗ Math Slope CalculatorSlope, line equation and angle between two points.➗ Math

Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.