Survey Statistics
Margin of Error Calculator
Calculate the margin of error for your survey to understand how accurately your sample represents the entire population.
Calculate Your Margin of Error
What is Margin of Error?
The margin of error indicates how much your survey results might differ from the true population value. A smaller margin of error means more accurate results.
How to Use This Calculator
- 1. Enter your expected sample size (number of responses)
- 2. Enter your total population size (or leave large for infinite)
- 3. Select your confidence level (95% is standard)
- 4. Click calculate to see your margin of error
Quick Tips
- • Larger sample sizes reduce margin of error
- • 95% confidence level is industry standard
- • For most surveys, aim for ±5% or less
Helpful Guides
Understanding Margin of Error
Why It Matters
If your survey shows 60% support with a ±5% margin of error, the true value is likely between 55% and 65%. This helps you understand the reliability of your findings.
Factors That Affect MOE
- • Sample size: Larger = smaller MOE
- • Confidence level: Higher = larger MOE
- • Population size: Smaller populations = smaller MOE