Base Formula
n0 = Z² · p · (1−p)e²
With Finite Correction
n = n01 + (n0−1) / N
Parameters
Adjust values then click Calculate
Z
Confidence Level
1.645=90% · 1.96=95% · 2.576=99%
p
Estimated Proportion
Use 0.5 for most conservative estimate
e
Margin of Error
Enter as decimal — 5% → 0.05
N
Population Size
Optional — enables finite correction
Required Sample Size
—
Fill in parameters and click Calculate.
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