(100p)th Percentiles of the t-distribution 1 p .75 .80 .85 .90 .95 .975 .98 .99 .995 .999 DF 1 1.00000 1.37638 1.96261 3.07768 6.31375 12.7062 15.8945 31.8205 63.6567 318.309 2 0.81650 1.06066 1.38621 1.88562 2.91999 4.3027 4.8487 6.9646 9.9248 22.327 3 0.76489 0.97847 1.24978 1.63774 2.35336 3.1824 3.4819 4.5407 5.8409 10.215 4 0.74070 0.94096 1.18957 1.53321 2.13185 2.7764 2.9985 3.7469 4.6041 7.173 5 0.72669 0.91954 1.15577 1.47588 2.01505 2.5706 2.7565 3.3649 4.0321 5.893 6 0.71756 0.90570 1.13416 1.43976 1.94318 2.4469 2.6122 3.1427 3.7074 5.208 7 0.71114 0.89603 1.11916 1.41492 1.89458 2.3646 2.5168 2.9980 3.4995 4.785 8 0.70639 0.88889 1.10815 1.39682 1.85955 2.3060 2.4490 2.8965 3.3554 4.501 9 0.70272 0.88340 1.09972 1.38303 1.83311 2.2622 2.3984 2.8214 3.2498 4.297 10 0.69981 0.87906 1.09306 1.37218 1.81246 2.2281 2.3593 2.7638 3.1693 4.144 11 0.69745 0.87553 1.08767 1.36343 1.79588 2.2010 2.3281 2.7181 3.1058 4.025 12 0.69548 0.87261 1.08321 1.35622 1.78229 2.1788 2.3027 2.6810 3.0545 3.930 13 0.69383 0.87015 1.07947 1.35017 1.77093 2.1604 2.2816 2.6503 3.0123 3.852 14 0.69242 0.86805 1.07628 1.34503 1.76131 2.1448 2.2638 2.6245 2.9768 3.787 15 0.69120 0.86624 1.07353 1.34061 1.75305 2.1314 2.2485 2.6025 2.9467 3.733 16 0.69013 0.86467 1.07114 1.33676 1.74588 2.1199 2.2354 2.5835 2.9208 3.686 17 0.68920 0.86328 1.06903 1.33338 1.73961 2.1098 2.2238 2.5669 2.8982 3.646 18 0.68836 0.86205 1.06717 1.33039 1.73406 2.1009 2.2137 2.5524 2.8784 3.610 19 0.68762 0.86095 1.06551 1.32773 1.72913 2.0930 2.2047 2.5395 2.8609 3.579 20 0.68695 0.85996 1.06402 1.32534 1.72472 2.0860 2.1967 2.5280 2.8453 3.552 21 0.68635 0.85907 1.06267 1.32319 1.72074 2.0796 2.1894 2.5176 2.8314 3.527 22 0.68581 0.85827 1.06145 1.32124 1.71714 2.0739 2.1829 2.5083 2.8188 3.505 23 0.68531 0.85753 1.06034 1.31946 1.71387 2.0687 2.1770 2.4999 2.8073 3.485 24 0.68485 0.85686 1.05932 1.31784 1.71088 2.0639 2.1715 2.4922 2.7969 3.467 25 0.68443 0.85624 1.05838 1.31635 1.70814 2.0595 2.1666 2.4851 2.7874 3.450 26 0.68404 0.85567 1.05752 1.31497 1.70562 2.0555 2.1620 2.4786 2.7787 3.435 27 0.68368 0.85514 1.05673 1.31370 1.70329 2.0518 2.1578 2.4727 2.7707 3.421 28 0.68335 0.85465 1.05599 1.31253 1.70113 2.0484 2.1539 2.4671 2.7633 3.408 29 0.68304 0.85419 1.05530 1.31143 1.69913 2.0452 2.1503 2.4620 2.7564 3.396 30 0.68276 0.85377 1.05466 1.31042 1.69726 2.0423 2.1470 2.4573 2.7500 3.385 35 0.68156 0.85201 1.05202 1.30621 1.68957 2.0301 2.1332 2.4377 2.7238 3.340 40 0.68067 0.85070 1.05005 1.30308 1.68385 2.0211 2.1229 2.4233 2.7045 3.307 45 0.67998 0.84968 1.04852 1.30065 1.67943 2.0141 2.1150 2.4121 2.6896 3.281 50 0.67943 0.84887 1.04729 1.29871 1.67591 2.0086 2.1087 2.4033 2.6778 3.261 60 0.67860 0.84765 1.04547 1.29582 1.67065 2.0003 2.0994 2.3901 2.6603 3.232 70 0.67801 0.84679 1.04417 1.29376 1.66691 1.9944 2.0927 2.3808 2.6479 3.211 80 0.67757 0.84614 1.04320 1.29222 1.66412 1.9901 2.0878 2.3739 2.6387 3.195 90 0.67723 0.84563 1.04244 1.29103 1.66196 1.9867 2.0839 2.3685 2.6316 3.183 100 0.67695 0.84523 1.04184 1.29007 1.66023 1.9840 2.0809 2.3642 2.6259 3.174