Cumulative t distribution calculator by Jan de Leeuw of UCLA

t distribution JavaScript program by John Pezzullo

Critical values for t (two-tailed) Use these for the calculation of confidence intervals. For example, use the 0.05 column for the 95% confidence interval.

df
0.10
0.05
0.025
0.01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
2.9200
2.3534
2.1318
2.0150
1.9432
1.8946
1.8595
1.8331
1.8125
1.7959
1.7823
1.7709
1.7613
1.7531
1.7459
1.7396
1.7341
1.7291
1.7247
1.7207
1.7171
1.7139
1.7109
1.7081
1.7056
1.7033
1.7011
1.6991
1.6973
1.6955
1.6939
1.6924
1.6909
1.6896
1.6883
1.6871
1.6860
1.6849
1.6839
1.6829
1.6820
1.6811
1.6802
1.6794
1.6787
1.6779
1.6772
1.6766
1.6759
1.6753
1.6747
1.6741
1.6736
1.6730
1.6725
1.6720
1.6716
1.6711
1.6706
1.6702
1.6698
1.6694
1.6690
1.6686
1.6683
1.6679
1.6676
1.6672
1.6669
1.6666
1.6663
1.6660
1.6657
1.6654
1.6652
1.6649
1.6646
1.6644
1.6641
1.6639
1.6636
1.6634
1.6632
1.6630
1.6628
1.6626
1.6624
1.6622
1.6620
1.6618
1.6616
1.6614
1.6612
1.6611
1.6609
1.6607
1.6606
1.6604
1.6602
4.3027
3.1824
2.7765
2.5706
2.4469
2.3646
2.3060
2.2622
2.2281
2.2010
2.1788
2.1604
2.1448
2.1315
2.1199
2.1098
2.1009
2.0930
2.0860
2.0796
2.0739
2.0687
2.0639
2.0595
2.0555
2.0518
2.0484
2.0452
2.0423
2.0395
2.0369
2.0345
2.0322
2.0301
2.0281
2.0262
2.0244
2.0227
2.0211
2.0195
2.0181
2.0167
2.0154
2.0141
2.0129
2.0117
2.0106
2.0096
2.0086
2.0076
2.0066
2.0057
2.0049
2.0040
2.0032
2.0025
2.0017
2.0010
2.0003
1.9996
1.9990
1.9983
1.9977
1.9971
1.9966
1.9960
1.9955
1.9949
1.9944
1.9939
1.9935
1.9930
1.9925
1.9921
1.9917
1.9913
1.9908
1.9905
1.9901
1.9897
1.9893
1.9890
1.9886
1.9883
1.9879
1.9876
1.9873
1.9870
1.9867
1.9864
1.9861
1.9858
1.9855
1.9852
1.9850
1.9847
1.9845
1.9842
1.9840
6.2054
4.1765
3.4954
3.1634
2.9687
2.8412
2.7515
2.6850
2.6338
2.5931
2.5600
2.5326
2.5096
2.4899
2.4729
2.4581
2.4450
2.4334
2.4231
2.4138
2.4055
2.3979
2.3910
2.3846
2.3788
2.3734
2.3685
2.3638
2.3596
2.3556
2.3518
2.3483
2.3451
2.3420
2.3391
2.3363
2.3337
2.3313
2.3289
2.3267
2.3246
2.3226
2.3207
2.3189
2.3172
2.3155
2.3139
2.3124
2.3109
2.3095
2.3082
2.3069
2.3056
2.3044
2.3033
2.3022
2.3011
2.3000
2.2990
2.2981
2.2971
2.2962
2.2954
2.2945
2.2937
2.2929
2.2921
2.2914
2.2906
2.2899
2.2892
2.2886
2.2879
2.2873
2.2867
2.2861
2.2855
2.2849
2.2844
2.2838
2.2833
2.2828
2.2823
2.2818
2.2813
2.2809
2.2804
2.2800
2.2795
2.2791
2.2787
2.2783
2.2779
2.2775
2.2771
2.2767
2.2764
2.2760
2.2757
9.9250
5.8408
4.6041
4.0321
3.7074
3.4995
3.3554
3.2498
3.1693
3.1058
3.0545
3.0123
2.9768
2.9467
2.9208
2.8982
2.8784
2.8609
2.8453
2.8314
2.8188
2.8073
2.7970
2.7874
2.7787
2.7707
2.7633
2.7564
2.7500
2.7440
2.7385
2.7333
2.7284
2.7238
2.7195
2.7154
2.7116
2.7079
2.7045
2.7012
2.6981
2.6951
2.6923
2.6896
2.6870
2.6846
2.6822
2.6800
2.6778
2.6757
2.6737
2.6718
2.6700
2.6682
2.6665
2.6649
2.6633
2.6618
2.6603
2.6589
2.6575
2.6561
2.6549
2.6536
2.6524
2.6512
2.6501
2.6490
2.6479
2.6469
2.6458
2.6449
2.6439
2.6430
2.6421
2.6412
2.6403
2.6395
2.6387
2.6379
2.6371
2.6364
2.6356
2.6349
2.6342
2.6335
2.6329
2.6322
2.6316
2.6309
2.6303
2.6297
2.6291
2.6286
2.6280
2.6275
2.6269
2.6264
2.6259