What is the Sample Size Calculator?
Planning a survey or thesis research? Enter the confidence level, the margin of error you can accept and the population size. The tool uses Cochran’s formula with finite population correction to tell you how many responses you need. Leave the expected proportion at 50% if unsure – it gives the safest (largest) sample.
How to use the Sample Size Calculator
- Pick confidence level (95% is common).
- Enter margin of error, e.g. 5%.
- Enter population size (leave blank if very large).
Why use 50%?
p = 0.5 gives the maximum variability, so the sample size is large enough for any result.
This Sample Size Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech