Sample Size Calculator

When you know how accurate you want your data to be, and you know the size of your target population, then you need to calculate how big a sample you need to draw from that population in order to have survey results that can be projected onto the target population. Click here for a basic explanation of the relevant statistic procedures.

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Sample Size Calculators

Calculate sample size needed to achieve a desired margin of error for ...

Proportions/Percentages Means

Means

Step 1:

Desired confidence level:99%  95%  90%

Step 2:

Desired margin of error:  ±

Step 3:

Estimated standard deviation:

Step 4:

Population size:infinite  actual/estimated
  • use 'infinite' when the group is larger than 1, or you don't know the actual size of the overall population

    Required Sample Size:

 

See Formula