The one-way repeated measures ANOVA calculator compares the means of three or more related groups when the same subjects are used in all conditions.

- First, input the values for at least three and up to five groups.
- Enter the single value in each cell. Commas and spaces are not allowed.
- Press the '+ Add Row' button to add rows to input more than five values.
- Press the 'Calculate' button to run the one-way repeated measures ANOVA test.
- As a result, the tool shows the degrees of freedom, sum of squares, mean square, F-ratio, and P-value associated with the between treatments, between subjects, and error.

The repeated measures ANOVA is a test used to compare the means of three or more dependent groups (samples) in which the same subjects participate in each group. It's also known as a within-subjects ANOVA (Analysis of Variance).