Sample size for proportion
Sample size for proportion: enter Z, p, Margin and get an instant result in your browser. Free, private, no account.
Sample size for proportion applies z * z * p * (1 - p) / e / e to the values you enter (Z, p, Margin). Use it for quick math estimates from your own numbers—not for regulated engineering, tax filing, or clinical decisions. Everything runs in your browser; nothing is uploaded to our servers.
How to use
- Open Sample size for proportion and read the field labels (Z, p, Margin).
- Replace defaults with figures from your spreadsheet, lab sheet, or quote.
- Press Calculate and note the output before changing another input.
- Bookmark this page if you reuse the same calculation often.
FAQ
Which numbers belong in Sample size for proportion?
Only the on-page labels: Z, p, Margin. The tool does not guess hidden assumptions.
How does Sample size for proportion compute its result?
It evaluates z * z * p * (1 - p) / e / e. If your source uses different symbols, map them to these fields first.
Can I paste the Sample size for proportion result into Excel or Sheets?
Yes—copy the number and keep your own documentation of inputs for audit trails.
Is Sample size for proportion a substitute for professional math software?
No. It is a lightweight browser helper for one relationship; use certified tools for compliance work.