Everyday tool
Survey Sample Size Calculator
Enter confidence, margin of error and expected proportion. Add population size for a finite-population adjustment.
Runs in your browser. No upload.
Values are processed locally in this browser.
Result
About this tool
Survey Sample Size Calculator made simple.
The estimate assumes random sampling and a proportion-based outcome. Nonresponse, clustering and sampling bias are not included.
Common questions
About Survey Sample Size Calculator.
How do I use Sample size calculator?
Enter confidence, margin of error and expected proportion. Add population size for a finite-population adjustment.
Is my data uploaded to a server?
No. This tool runs locally in your browser. Your input is not uploaded.