Online Student’s T Test Calculator, Table

This online t-value tool is used to calculate the Students t-value based on specified user inputs.

Points to be remembered, before use this calculator

Significance level must be a number between 0.00001 and 0.99999

To derive one-tailed result, enter the right-tail probability.

To derive two-tailed result, enter the sum of the probabilities in both tails.

Students T-Value Table

Column header are the Significance Level (α).

Row names are the Degrees of Freedom (df).

df/α 0.9 0.5 0.3 0.2 0.1 0.05 0.02 0.01 0.001
1 0.158 1 2 3.078 6.314 12.706 31.821 64 637
2 0.142 0.816 1.386 1.886 2.92 4.303 6.965 10 31.598
3 0.137 0.765 1.25 1.638 2.353 3.182 4.541 5.841 12.929
4 0.134 0.741 1.19 1.533 2.132 2.776 3.747 4.604 8.61
5 0.132 0.727 1.156 1.476 2.015 2.571 3.365 4.032 6.869
6 0.131 0.718 1.134 1.44 1.943 2.447 3.143 3.707 5.959
7 0.13 0.711 1.119 1.415 1.895 2.365 2.998 3.499 5.408
8 0.13 0.706 1.108 1.397 1.86 2.306 2.896 3.355 5.041
9 0.129 0.703 1.1 1.383 1.833 2.263 2.821 3.25 4.781
10 0.129 0.7 1.093 1.372 1.812 2.228 2.764 3.169 4.587
11 0.129 0.697 1.088 1.363 1.796 2.201 2.718 3.106 4.437
12 0.128 0.695 1.083 1.356 1.782 2.179 2.681 3.055 4.318
13 0.128 0.694 1.079 1.35 1.771 2.16 2.65 3.012 4.221
14 0.128 0.692 1.076 1.345 1.761 2.145 2.624 2.977 4.14
15 0.128 0.691 1.074 1.341 1.753 2.131 2.602 2.947 4.073
16 0.128 0.69 1.071 1.337 1.746 2.12 2.583 2.921 4.015
17 0.128 0.689 1.069 1.333 1.74 2.11 2.567 2.898 3.965
18 0.127 0.688 1.067 1.33 1.734 2.101 2.552 2.878 3.922
19 0.127 688 1.066 1.328 1.729 2.093 2.539 2.861 3.883
20 0.127 0.687 1.064 1.325 1.725 2.086 2.528 2.845 3.85
21 0.127 0.686 1.063 1.323 1.721 2.08 2.518 2.831 3.819
22 0.127 0.686 1.061 1.321 1.717 2.074 2.508 2.819 3.792
23 0.127 0.685 1.06 1.319 1.714 2.069 2.5 2.807 3.767
24 0.127 0.685 1.059 1.318 1.711 2.064 2.492 2.797 3.745
25 0.127 0.684 1.058 1.316 1.708 2.06 2.485 2.787 3.725
26 0.127 0.684 1.058 1.315 1.706 2.056 2.479 2.779 3.707
27 0.137 0.684 1.057 1.314 1.703 2.052 2.473 2.771 3.69
28 0.127 0.683 1.056 1.313 1.701 2.048 2.467 2.763 3.674
29 0.127 0.683 1.055 1.311 1.699 2.045 2.462 2.756 3.649
30 0.127 0.683 1.055 1.31 1.697 2.042 2.457 2.75 3.656
40 0.126 0.681 1.05 1.303 1.684 2.021 2.423 2.704 3.551
80 0.126 0.679 1.046 1.296 1.671 2 2.39 2.66 3.46
120 0.126 0.677 1.041 1.289 1.658 1.98 2.358 2.617 3.373
0.126 0.674 1.036 1.282 1.645 1.96 2.326 2.576 3.291

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