Sample Size calculator For 1 Sample T Test

Hint: Use this calculator to determine the number of samples to compare the mean of a population with a standard, expected or target value.

Confidence Level
The minimum acceptable probability of preventing type I error
- 90%
- 95%
- 99%
- 99.9%
Power of the Test
The minimum acceptable probability of preventing type II error
- 50%
- 80%
- 90%
- 95%
- 99%
Reference Mean Value
This is the standard or target or the known mean
Sample Standard Deviation
This is the known or estimated (from research) or the sample standard deviation
Sample Mean Value
This is the mean of the sample (in question)
Sample Size for 1 Sample T Test
Minimum samples required to check if your mean is similar to the standard or reference mean