Stat Tools
Fast statistical calculators
Tools
Examples
Test Selector
Significance
t-test
ANOVA
Std Dev & Uncertainty
Confidence Interval
Sample Size
Multiple Testing
Effect Size
Outliers
Sample size calculator
Estimate how many observations you need + steps.
Inputs
Mode
Mean
Proportion
Confidence level
90%
95%
99%
Margin of error (E)
Mean inputs
Estimated standard deviation (sd)
Proportion inputs
Estimated proportion (p̂)
Tip: p̂ = 0.5 gives the maximum required sample size.
Compute
Result
Submit values to compute required n.
