Survey Researcher how-to
How to Calculate a Margin of Error
Margins show uncertainty.
Quick answer
Margins show uncertainty. In short: find; choose; use, then complete the remaining steps below.
Step by step
Find sample size.
Choose confidence level.
Use the proportion.
Apply the formula.
Adjust for design effect.
Report clearly.
Safety reminders for survey researchers
- Protect respondent confidentiality
- Follow IRB rules
- Get informed consent
- Store data securely
Key terms
Sample · Population · Margin of error · Response rate · Weighting · Leading question: see the full survey researcher glossary.