How to calculate margin of error

Margin of Error Calculator

Margin of Error Formula

The margin of error formula: MOE = z * √(p(1-p)/n) * √((N-n)/(N-1))
Where:
z = z-score (1.645 for 90%, 1.96 for 95%, 2.576 for 99% confidence)
p = proportion (0.5 for maximum variability)
n = sample size
N = population size (optional for finite population correction)