Sample Size Confidence Estimator

Quickly estimate how confident you can be in your survey results based on your sample size, population, and margin of error preferences.

Population Size

Sample Size

Cost Per Response ($)

Target Margin of Error (%)

Apply finite population correctionShow values as percentages

Estimated Confidence Level: Insufficient data for high confidence

With a sample size of 100, the app estimates how confident you can be that your survey results reflect the views of the full population of 1000 people. Larger sample sizes reduce uncertainty and give you a tighter margin of error.

Estimated Study Cost: $0

Sample Size Recommendations (Always Visible)

To reach common confidence levels with your selected margin of error (5.0%) and population size of 1,000, you would need approximately:

Confidence Level	Required Sample Size
85%	172
90%	214
95%	278