Sample Size Calculator 📊

About Sample Size Calculator

Determine the ideal sample size for your market research or survey. This calculator uses standard statistical formulas to ensure your results are reliable and representative.

Definitions

• Confidence Level: How sure you can be. 95% is standard. It means 95% of the time, the true result is within the margin of error.
• Margin of Error: The range of accuracy. +/- 5% means if 50% of your sample says "Yes", the true number is between 45% and 55%.
• Population: The total group you are studying. If it's very large (like "all US adults"), the exact number matters less.

How to Use

1. Select your desired Confidence Level (usually 95%).
2. Enter your acceptable Margin of Error (usually 5%).
3. Enter the Population Size (leave blank if unknown/huge).
4. The result shows how many people you need to survey.