Free Margin of Error Calculator
Margin of error for a survey proportion.
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Margin of error
±4.90%
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Short answer
Margin of error for a survey proportion.
What is the Margin of Error Calculator?
Margin of error for a survey proportion.
How does the Margin of Error Calculator work?
Enter the inputs above and read the result.
Formula
Variables
pSample proportionnSample size
Explanation
A larger sample or a proportion closer to 0% or 100% shrinks the margin of error.
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Related concepts
The Margin of Error Calculator sits inside the Math Calculators hub, in the statistics & probability cluster. Describing data and quantifying uncertainty. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Margin of Error
Margin of error for a survey proportion. Within math calculators, margin of error belongs to the statistics & probability cluster, where it shares terminology and assumptions with closely related tools.
Learning how margin of error is calculated
A larger sample or a proportion closer to 0% or 100% shrinks the margin of error. Working through the variables one at a time — p, n — makes the result reproducible by hand and easier to sanity-check.
Using margin of error to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How margin of error compares with related measures
distribution, dispersion, significance, sample all describe adjacent aspects of statistics & probability. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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