Sample Size Calculator

Determine the sample size needed for your survey or study.

Estimate Type

Margin of Error (%)

Acceptable margin of error

Expected Proportion (%)

Use 50% if unknown (conservative)

Population Size (optional)

Leave empty for infinite/large population

Confidence Level

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Required Sample Size

0

Assuming large/infinite population

Base Sample Size

Z-Critical

MOE

±3%

Sample Size for Different MOEs

±1%

9,604

±2%

2,401

±3%

1,068

±5%

385

Documentation

Sample Size Determination

Sample size calculations ensure your study has enough participants to achieve the desired precision. The formulas differ for estimating proportions vs. means.

Proportion

Mean

FPC

Frequently Asked Questions