Sample Sizes Required for a 95% Confidence Level
The chart below gives sample sizes required for a 95% confidence level with confidence intervals from ± 1% to ± 5%
± 1%
± 2%
± 3%
± 4%
± 5%
Size of the Population:
1,000 2,000
* *
* *
* 696
375 462
278 322
3,000 4,000 5,000
* * *
1,334 1,500 1,622
787 842 879
500 522 536
341 350 357
10,000 20,000
4,899 6,489
1,936 2,144
964 1,013
566 583
370 377
50,000 100,000 500,000+
8,057 8,763 9,423
2,291 2,345 2,390
1,045 1,056 1,065
593 597 600
381 383 384
* In these cases more than 50% of the population is required