Survey Sample Size Calculator
Determine the precise number of survey respondents needed for statistically significant results. Avoid overspending on panels and ensure your data is robust.
Calculator Inputs
Adjust the values to determine your required sample size.
Required Sample Size
The number of completed surveys you need for your desired level of precision.
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Respondents
Interpretation & Recommendations
Your selected parameters meet common industry standards for market research, providing a good balance of precision and feasibility.
Tip: Always plan for non-responses. If you need 0 completed surveys and you expect a 10% response rate, you will need to invite at least 0 people.
Understanding Sample Size Calculation
This calculator helps you determine the number of people you need to survey to be confident that the results reflect your target population.
Key Concepts Explained
Population Size: The total number of people in the group you want to study. If you don't know it, you can leave it blank for a very large population.
Confidence Level: The probability that your sample accurately reflects the attitudes of your population. The industry standard is 95%.
Margin of Error: The maximum amount you are willing to allow your sample results to differ from the true population. A 5% margin of error means you're confident the true result is within +/- 5% of your survey result.
How Inputs Affect Sample Size
Larger Population Size: Increases the required sample size, but with diminishing returns. The difference between a population of 10,000 and 100,000 is small.
Higher Confidence Level: Increases the required sample size. Being more confident requires more data.
Lower Margin of Error: Increases the required sample size. Being more precise requires more data.