KLOORASample Size Calculator
Work out how many survey responses you need for a chosen confidence level and margin of error.
Quick answer: Sample Size Calculator: Work out how many survey responses you need for a chosen confidence level and margin of error. Everything runs in your browser, so nothing you enter is uploaded or stored.
How to use Sample Size Calculator
- Enter your values in the fields.
- The results update instantly as you type.
- Note or copy the numbers you need.
Features
- Instant results
- Free, no signup
- Runs in your browser, nothing is uploaded
- Works on phone and desktop
Frequently asked questions
What formula does it use?
Cochran: n = z squared x p x (1 - p) / e squared, then adjusted for a finite population.
What proportion should I use?
Use 50 percent if you do not know, because it gives the largest and safest sample.
Is the Sample Size Calculator free?
Yes. It is free, needs no signup and works on any device.