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.
Difference to Detect:
Compare a Mean to a Standard
Compare Two Means
Please enter the standard deviation and the difference to detect.