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Degrees of Freedom Calculator
Degrees of freedom for common t-tests and chi-square tests.
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Two-sample (pooled) df
Compare Your Options And Get Clear Answers
Degrees of freedom for common t-tests and chi-square tests.
Degrees of Freedom Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Pooled df = n1 + n2 – 2.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Degrees Quick Guide
Typical values for reference.
| n1 | n2 | Variance 1 | Pooled df |
|---|---|---|---|
| 25 | 30 | 4 | 53 |
| 10 | 12 | 2 | 20 |
| 50 | 40 | 5 | 88 |
| 8 | 8 | 1 | 14 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Degrees of Freedom Calculator FAQ
Answers to common questions about this calculator.
The number of independent values free to vary.
n1 + n2 – 2.
An adjusted df for unequal variances.
(rows – 1) x (columns – 1).