Input
Leave blank for infinite population
Confidence Level
Use 50% if unsure (maximizes sample size)
Result
Required Sample Size
385
Margin of Error
±4.99%
Confidence Level
95%
Proportion
50%
Common Sample Sizes
5% Margin · 50% Proportion| Population | 90% CL | 95% CL | 99% CL |
|---|---|---|---|
| 500 | 176 | 218 | 286 |
| 1,000 | 214 | 278 | 400 |
| 5,000 | 257 | 357 | 586 |
| 10,000 | 264 | 370 | 623 |
| 50,000 | 270 | 382 | 655 |
| 100,000 | 270 | 383 | 660 |
| 1,000,000 | 271 | 385 | 664 |
| Infinite | 271 | 385 | 664 |
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