# Student T-Value Calculator

An online student t value calculator.

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