Margin of Error Calculator

Calculate the margin of error for surveys and polls.

Sample size (n)

Proportion estimate (p)

Confidence level

Margin of Error

± 0.03099

z* (critical)

1.96

Std Error

0.01581

n for ½ ME

4001

Use p=0.5 (proportion) for worst-case ME. "n for ½ ME" is the sample size needed to halve the margin of error.