t table

Calculate p(x≤X)
For negative x values: p(x ≤ -X) = 1 - p(x ≤ X)

For any practical use you can use the above calculator instead of the t table. The below t table is a bit more accurate.
Examples: Row 4: DF=3, column 5: t_0.99
P(x ≤ 4.5407028586 ) = 0.99

DF	t_0.999	t_0.9975	t_0.995	t_0.99	t_0.975	t_0.95	t_0.9	t_0.85	t_0.8	t_0.7
1	318.3088389856	127.3213364689	63.6567411629	31.8205159538	12.7062047362	6.3137515147	3.0776835372	1.9626105055	1.3763819205	0.726542528
2	22.3271247701	14.0890472756	9.9248432009	6.9645567343	4.3026527297	2.9199855804	1.8856180832	1.3862065602	1.0606601718	0.6172133998
3	10.2145318524	7.4533185052	5.8409093097	4.5407028586	3.1824463053	2.3533634348	1.6377443537	1.249778105	0.9784723124	0.5843897274
4	7.1731822198	5.5975683671	4.6040948713	3.746947388	2.7764451052	2.1318467863	1.5332062741	1.1895668524	0.9409645772	0.568649063
5	5.8934295314	4.7733406049	4.0321429836	3.3649299989	2.5705818356	2.0150483733	1.4758840488	1.1557673429	0.9195437802	0.5594296445
6	5.2076262387	4.3168271036	3.7074280213	3.1426684033	2.4469118511	1.9431802805	1.4397557473	1.1341569307	0.9057032852	0.5533809236
7	4.7852896286	4.0293371776	3.4994832974	2.9979515669	2.3646242516	1.8945786051	1.4149239277	1.1191591284	0.8960296443	0.5491096579
8	4.5007909337	3.8325186853	3.3553873313	2.8964594477	2.3060041352	1.8595480375	1.3968153097	1.1081454446	0.8888895178	0.5459337635
9	4.2968056627	3.6896623923	3.2498355416	2.821437925	2.2621571628	1.8331129327	1.3830287384	1.0997161964	0.8834038597	0.5434802415
10	4.143700494	3.5814062021	3.1692726726	2.7637694581	2.228138852	1.8124611228	1.3721836411	1.0930580736	0.8790578286	0.5415280388
11	4.0247010376	3.4966141733	3.1058065155	2.7180791838	2.2009851601	1.7958848187	1.363430318	1.0876663804	0.8755299781	0.5399378785
12	3.9296332646	3.4284442423	3.0545395894	2.6809979931	2.1788128297	1.7822875556	1.356217334	1.0832114205	0.8726092916	0.5386176682
13	3.8519823912	3.372467941	3.0122758387	2.6503088379	2.1603686565	1.770933396	1.3501712888	1.079468737	0.870151534	0.5375040895
14	3.7873902375	3.3256958178	2.9768427344	2.6244940676	2.1447866879	1.7613101358	1.3450303745	1.0762802446	0.8680547816	0.5365521798
15	3.7328344253	3.2860385709	2.9467128835	2.602480295	2.1314495456	1.7530503557	1.3406056079	1.0735313956	0.8662449732	0.535729133
16	3.6861547927	3.2519928744	2.9207816224	2.5834871853	2.1199052992	1.7458836763	1.3367571673	1.0711371633	0.8646670018	0.5350104529
17	3.6457673801	3.2224499114	2.8982305197	2.5669339837	2.1098155778	1.7396067261	1.3333793897	1.0690331106	0.8632790174	0.5343774798
18	3.6104848848	3.1965742223	2.8784404727	2.5523796302	2.1009220402	1.7340636066	1.3303909436	1.0671695155	0.862048668	0.5338157505
19	3.579400149	3.1737245308	2.8609346065	2.5394831906	2.0930240544	1.7291328115	1.327728209	1.0655073986	0.8609505503	0.5333138816
20	3.5518083432	3.1534005329	2.8453397098	2.5279770027	2.0859634473	1.7247182429	1.325340707	1.0640157712	0.8599644397	0.5328627916
21	3.5271536689	3.1352062454	2.831359558	2.517648016	2.0796138447	1.7207429028	1.3231878739	1.0626696881	0.8590740352	0.532455147
22	3.5049920311	3.1188242069	2.8187560606	2.5083245529	2.0738730679	1.7171443744	1.3212367416	1.0614488434	0.8582660517	0.5320849613
23	3.4849643749	3.1039969631	2.8073356838	2.4998667395	2.0686576104	1.7138715277	1.3194602398	1.0603365396	0.8575295537	0.5317472993
24	3.466777298	3.0905135487	2.7969395048	2.4921594732	2.0638985616	1.7108820799	1.3178359337	1.0593189208	0.8568554581	0.5314380561
25	3.450188727	3.0781994605	2.7874358137	2.4851071754	2.0595385528	1.7081407613	1.3163450727	1.0583843926	0.8562361577	0.5311537896
26	3.4349971816	3.0669091164	2.7787145333	2.4786298236	2.0555294386	1.7056179198	1.3149718643	1.0575231793	0.8556652333	0.5308915918
27	3.4210336212	3.0565201089	2.7706829571	2.472659912	2.0518305165	1.7032884457	1.3137029128	1.0567269804	0.8551372307	0.5306489893
28	3.4081551784	3.0469287751	2.7632624555	2.467140098	2.0484071418	1.7011309343	1.3125267816	1.0559887028	0.8546474856	0.5304238649
29	3.3962402884	3.0380467448	2.7563859037	2.4620213602	2.0452296421	1.6991270265	1.3114336473	1.0553022487	0.8541919859	0.5302143957
30	3.3851848668	3.0297982236	2.7499956536	2.4572615424	2.0422724563	1.6972608866	1.3104150254	1.0546623472	0.8537672615	0.5300190039
35	3.3400452021	2.9960466119	2.7238055892	2.4377225471	2.0301079283	1.6895724578	1.306211802	1.0520194267	0.852011889	0.5292106858
40	3.3068777141	2.9711712949	2.7044592674	2.4232567793	2.0210753903	1.6838510133	1.3030770526	1.0500457784	0.8506997958	0.5286056796
45	3.2814798482	2.9520791273	2.6895850194	2.4121158757	2.0141033889	1.6794273927	1.3006493323	1.0485157652	0.8496819047	0.5281358519
50	3.2614090558	2.9369640853	2.6777932709	2.4032719167	2.0085591121	1.6759050252	1.2987136942	1.0472949266	0.8488692445	0.5277604527
55	3.245149105	2.9247010367	2.6682159885	2.3960810526	2.0040447833	1.6730339653	1.2971342999	1.0462981518	0.8482054327	0.5274536145
60	3.231709126	2.9145525754	2.6602830289	2.3901194726	2.000297822	1.6706488649	1.2958210935	1.0454689431	0.8476530064	0.5271981272
65	3.2204142711	2.906015287	2.6536044694	2.3850968156	1.9971379084	1.6686359758	1.2947120131	1.044768324	0.8471861012	0.5269820958
70	3.210789061	2.8987337748	2.6479046238	2.3808074823	1.9944371118	1.6669144791	1.2937628979	1.0441685359	0.846786285	0.5267970357
75	3.2024888408	2.8924499923	2.642983067	2.3771018124	1.992102154	1.6654253733	1.2929414686	1.0436492737	0.8464400675	0.5266367323
80	3.1952576903	2.8869720508	2.6386905963	2.373868273	1.9900634213	1.6641245786	1.2922235831	1.0431953408	0.8461373479	0.5264965293
90	3.1832708141	2.8778841835	2.6315651656	2.3684974762	1.9866745407	1.661961084	1.2910288987	1.0424396599	0.8456332729	0.5262629873
100	3.1737394937	2.8706515238	2.6258905214	2.3642173662	1.9839715185	1.6602343261	1.2900747613	1.0418359009	0.8452304245	0.5260762706
110	3.1659793676	2.8647586424	2.6212645435	2.3607263417	1.9817652821	1.6588241874	1.2892951663	1.0413424352	0.8449010934	0.5259235798
120	3.1595387433	2.8598648488	2.6174211451	2.3578246126	1.9799304051	1.6576508994	1.2886462337	1.0409315704	0.8446268377	0.5257963906
130	3.1541074721	2.855735932	2.6141772376	2.3553745849	1.9783804054	1.6566594127	1.2880976544	1.0405841685	0.844394908	0.5256888068
1-P	0.001	0.0025	0.005	0.01	0.025	0.05	0.1	0.15	0.2	0.3