Reference table
Survey sample size by population size
Required responses at 95% confidence and a 5% margin of error
This reference table lists the number of survey responses needed at 95% confidence and a 5% margin of error, for populations from 100 people up to 100,000 or more. Small populations need a finite population correction, which cuts the number sharply. Large ones level off at 384. Use it to size a customer or user survey before you recruit.
Where this appears
What's in this reference table
| Population size | Required sample |
|---|---|
| 100 | 80 |
| 250 | 152 |
| 500 | 217 |
| 1,000 | 278 |
| 5,000 | 357 |
| 10,000 | 370 |
| 50,000 | 381 |
| 100,000+ | 384 |
Use this image
Free to use in your docs, decks and posts under CC BY 4.0, as long as you credit Koji with a link to this page. To embed it, paste this into your page:
html
<a href="https://www.koji.so/visuals/survey-sample-size-by-population-table"><img src="https://www.koji.so/visuals/survey-sample-size-by-population-table/survey-sample-size-by-population-table.png" alt="Table of the survey sample size needed at 95% confidence and a 5% margin of error for populations from 100 to 100,000 or more, topping out at 384." width="1200" height="782" /></a>
<p>Source: <a href="https://www.koji.so/visuals/survey-sample-size-by-population-table">Survey sample size by population size</a>, Koji</p>
