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Two Sample T Test Calculator
Run a Welch two-sample t test from summary statistics for two groups.
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Run a Welch two-sample t test from summary statistics for two groups.
Two Sample T Test Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: t = (m1 – m2) / sqrt(s1^2/n1 + s2^2/n2), Welch df.
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
Two Quick Guide
Typical values for reference.
| Means | SDs | Sizes | Result |
|---|---|---|---|
| 52 vs 48 | SD 8/9 | n 30/32 | t 1.85, p 0.0690 |
| 60 vs 50 | SD 10/12 | n 25/25 | t 3.20, p 0.0025 |
| 101 vs 100 | SD 15/15 | n 100/100 | t 0.47, p 0.6379 |
| 5.2 vs 4.1 | SD 1.1/1.3 | n 12/14 | t 2.34, p 0.0281 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Two Sample T Calculator FAQ
Answers to common questions about this calculator.
It compares the means of two independent groups.
It does not need equal variances.
Evidence that the group means differ.
No, only a difference.