Sample Size Calculator

Enter a population size to determine the sample sizes required to achieve various theoretical margins of error, plus or minus, 95% of the time, for questions where opinion is evenly split.

Population size.................
Plus or minus:
1 percentage point...........		6 percentage points..........
2 percentage points.........		7 percentage points..........
3 percentage points.........		8 percentage points..........
4 percentage points.........		9 percentage points..........
5 percentage points.........		10 percentage points........

Other calculators:

Margin of Error Calculator, Ballot Lead Calculator