T-Distribution Table (T-Table) | Statistics Math Solver

T-Distribution Table

Find critical values for t-tests. Supports both one-tailed and two-tailed probabilities (alpha levels).

How to use:

1. Find your Degrees of Freedom (df) in the left column (usually n – 1).
2. Locate your Alpha Level (α) in the top row (choose One-Tail or Two-Tail).
3. The intersection is your Critical T-Value.

df	Confidence Level
df	80%	90%	95%	98%	99%	99.9%
One-Tail	0.10	0.05	0.025	0.01	0.005	0.0005
Two-Tail	0.20	0.10	0.05	0.02	0.01	0.001
1	3.078	6.314	12.706	31.821	63.657	636.62
2	1.886	2.920	4.303	6.965	9.925	31.599
3	1.638	2.353	3.182	4.541	5.841	12.924
4	1.533	2.132	2.776	3.747	4.604	8.610
5	1.476	2.015	2.571	3.365	4.032	6.869
6	1.440	1.943	2.447	3.143	3.707	5.959
7	1.415	1.895	2.365	2.998	3.499	5.408
8	1.397	1.860	2.306	2.896	3.355	5.041
9	1.383	1.833	2.262	2.821	3.250	4.781
10	1.372	1.812	2.228	2.764	3.169	4.587
11	1.363	1.796	2.201	2.718	3.106	4.437
12	1.356	1.782	2.179	2.681	3.055	4.318
15	1.341	1.753	2.131	2.602	2.947	4.073
20	1.325	1.725	2.086	2.528	2.845	3.850
30	1.310	1.697	2.042	2.457	2.750	3.646
40	1.303	1.684	2.021	2.423	2.704	3.551
60	1.296	1.671	2.000	2.390	2.660	3.460
120	1.289	1.658	1.980	2.358	2.617	3.373
∞	1.282	1.645	1.960	2.326	2.576	3.291

Calculate T-Value Automatically