GPower 3.1

Free Calculates the statistical power of various tests
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Use a one-way or a multi-way ANOVA to compute the power of statistical tests like chi-square-tests, t-test, F-tests, Z-tests, etc. The tool takes into account several variables including the number of groups, significance level, effect size, etc.

G*Power is a tool to compute statistical power analyses for many different t tests, F tests, χ2 tests, z tests and some exact tests. G*Power can also be used to compute effect sizes and to display graphically the results of power analyses. The software also allows you to generate graphs based on the data you input.

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3.8
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Sherri Turner
Love It. Journal editors accept this as a valid way to calculate power.

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su kalyar hlaing
That is very useful for sample size calculation.

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