Margin of Error Calculator
Calculate the margin of error for your survey results based on sample size, confidence level, population size, and expected proportion.
Inputs
Results
Margin of Error
5%
How to Use This Calculator
- Enter the population size if known (or leave as infinite for very large populations).
- Set the desired confidence level: 90%, 95%, or 99%.
- Input the expected proportion or use 50% (most conservative) if unknown.
- Review the Margin of Error and the Required Sample Size for your parameters.
- Adjust the confidence level or acceptable margin to find a sample size that fits your budget.
Related Calculators
Survey Response Rate Calculator
Determine how many survey invitations you need to send to achieve your target number of completed responses, accounting for response and completion rates.
Quota Sampling Calculator
Calculate the number of survey responses needed from each population stratum using proportional quota sampling. Ensures your sample mirrors the population composition.
Sampling Frame Calculator
Calculate the design effect and effective sample size for cluster sampling designs. Understand how intraclass correlation and cluster size reduce your statistical power.
Net Promoter Score Calculator
Calculate your Net Promoter Score (NPS) from survey responses. Enter the count of promoters, passives, and detractors to see your score and classification.