Margin of Error: n = 2000, p = 0.5, 99% Confidence
A large 2000-person sample with 99% confidence (Z* = 2.576) and p = 0.5 gives a margin of error of about ±2.88%.
How to use this tool
- Enter sample size (n), proportion (p) and z* (confidence level) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your margin of error and the full breakdown beneath it.
Compute the margin of error for a large 2000-person survey at 99% confidence, typical for national tracking studies.
Frequently asked questions
- What is the margin of error?
- The margin of error quantifies the uncertainty in a sample proportion estimate. A MOE of ±3% at 95% confidence means the true proportion is within 3 percentage points of the observed proportion 95% of the time.