Learn Updated 2026-03-07 UTC

t Table (Student’s t Distribution Critical Values) — GetCalcMaster

t distribution critical values table (two‑tailed α) across common degrees of freedom, plus a quick guide for one‑tailed vs two‑tailed tests.

A practical t table for common degrees of freedom (df) and two‑tailed significance levels α.

Educational reference. Conventions differ (one‑tailed vs two‑tailed); verify which one your class/paper expects.

t critical values (two-tailed α)

This table shows t* such that P(|T| ≤ t*) = 1 − α for the given degrees of freedom (df). For one-tailed tests, use α_one = α_two/2.

df	α=0.1	α=0.05	α=0.02	α=0.01
1	6.314	12.706	31.821	63.657
2	2.92	4.303	6.965	9.925
3	2.353	3.182	4.541	5.841
4	2.132	2.776	3.747	4.604
5	2.015	2.571	3.365	4.032
6	1.943	2.447	3.143	3.707
7	1.895	2.365	2.998	3.499
8	1.86	2.306	2.896	3.355
9	1.833	2.262	2.821	3.25
10	1.812	2.228	2.764	3.169
11	1.796	2.201	2.718	3.106
12	1.782	2.179	2.681	3.055
13	1.771	2.16	2.65	3.012
14	1.761	2.145	2.624	2.977
15	1.753	2.131	2.602	2.947
16	1.746	2.12	2.583	2.921
17	1.74	2.11	2.567	2.898
18	1.734	2.101	2.552	2.878
19	1.729	2.093	2.539	2.861
20	1.725	2.086	2.528	2.845
21	1.721	2.08	2.518	2.831
22	1.717	2.074	2.508	2.819
23	1.714	2.069	2.5	2.807
24	1.711	2.064	2.492	2.797
25	1.708	2.06	2.485	2.787
26	1.706	2.056	2.479	2.779
27	1.703	2.052	2.473	2.771
28	1.701	2.048	2.467	2.763
29	1.699	2.045	2.462	2.756
30	1.697	2.042	2.457	2.75
40	1.684	2.021	2.423	2.704
60	1.671	2	2.39	2.66
120	1.658	1.98	2.358	2.617
∞	1.645	1.96	2.326	2.576

Compute degrees of freedom (often df = n − 1 for a one-sample mean).
Choose α (two-tailed) based on your confidence level or hypothesis test.
Read the critical value t* at the df row and α column.
For one-tailed tests, use α_one = α_two/2 (e.g., α=0.05 one-tailed corresponds to α=0.10 two-tailed).

CSV/JSON endpoints are fully static (/data/stats/*), cache-friendly, and marked noindex to avoid SEO duplication.

Tip: for programmatic use, start with the stats-manifest.json to discover all available files.

Last updated: 2026-03-07

GetCalcMaster. (2026-03-07). t Table (Student’s t Distribution Critical Values). Retrieved from {CANONICAL_URL}