Sample Size Calculator

SAMPLE SIZE CALCULATOR

Get the Right Sample Size for Reliable Research

Determine the ideal number of respondents required for your survey with our easy-to-use Sample Size Calculator.

Whether you’re conducting baseline assessments, impact evaluations, or community research, get a reliable sample size based on your research parameters.

Why Use Our Calculator?

Accurate Sample Size Estimation
Flexible Confidence Levels
Customisable Margin of Error
Cluster Sampling Adjustment

Make informed research decisions with the right sample size.

Cochran’s Formula

Calculate the sample size you need for a survey. Each step is shown as you fill in the values.

p = estimated proportion of the attribute in the population

Enter p (%) Not sure? Enter 50 for the safest (largest) sample.

e = margin of error (precision level)

Z = value corresponding to confidence level (e.g., 1.96 for 95% confidence)

ρ [intra-cluster correlation coefficient (ICC)] Optional. A value between 0 and 1, e.g. 0.05

m = average number of respondents per cluster Optional. Leave ρ and m empty if you are not using clusters.

Final Sample Size

–

n₀ = Z² × p × q / e² where q = 1 − p
Design Effect = 1 + (m − 1) × ρ, then n = n₀ × Design Effect

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