t-Test Sample Size Calculator

Standard Deviation:

Difference to Detect:


Confidence:
90% 95% 99%

Power:
50% 60% 75% 90% 95% 99%

Test Type:
Compare a Mean to a Standard Compare Two Means

Please enter the number of standard deviation and the difference to detect.

You can purchase a Sample Size Calculator for just $14.95.

This calculator tells you the estimated number of replicates required to perform a t-Test with the specified confidence and power.

The standard deviation comes from previous data. If you don't know this, you will need to run a few replicates (3 to 5) to determine an estimate.

The difference to detect comes from your engineering judgement.

The sample size is for each mean.