Free Online Sample Size Calculator
Calculate your Sample Size with this free math tool.
Enter values and select Calculate to see your result.
About this calculator
The Sample Size Calculator is a free online math tool on Calcuto. Enter Margin Of Error, Proportion and Confidence Level Percent, and it instantly works out your Sample Size result and shows it below the form. You can change any value and recalculate right away to compare different scenarios. There is no sign-up and nothing to install: it works in any modern browser, on desktop, tablet, or phone.
How to use it
To use the Sample Size Calculator, enter Margin Of Error, Proportion and Confidence Level Percent in the form above and select Calculate. Calcuto runs the Sample Size calculation from your inputs and shows the result below the form. Change any input and calculate again to compare scenarios.
Frequently asked questions
Is the Sample Size Calculator free to use?
Yes. The Sample Size Calculator is completely free, with no sign-up or download required.
What information do I need for the Sample Size Calculator?
Provide Margin Of Error, Proportion and Confidence Level Percent, then select Calculate to see your result.
Is my data saved when I use the Sample Size Calculator?
No personal data is saved. Your inputs are used only to work out the result and are not stored; only your currency and theme preferences are kept in your own browser.
Does the Sample Size Calculator work on mobile?
Yes. It works in any modern web browser on desktop, tablet, and mobile.