Sample Size Calculator
Sample size for margin of error.
Result
Sample size
385
Common questions
How do I determine the right sample size for a survey?
It depends on population size, confidence level (usually 95%), and margin of error (commonly 3–5%). The calculator uses these inputs to determine the minimum number of respondents needed.
What margin of error should I use?
A ±5% margin is common for general surveys. For research requiring higher precision, use ±3% or less. Smaller margins require larger sample sizes.