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T-distribution Calculator - Online

Below you can find a T-distribution Calculator. The shape of the Student's t-distribution is determined by the degrees of freedom. Its shape changes as the degrees of freedom increases.



t distribution calculator online
Student's t-distribution curve

The shaded area represents the right-tail value for t. 

The right-tail value is approximated using the following formula:

right tail values for Students t-distribution

where

a1 = 0.196854
a2 = 0.115194
a3 = 0.000344
a4 = 0.019527

x value for Students t distrubution

d = degrees of freedom

epsilon value for t-distribution

Example:

Determine the right-tail value when t = 2.9 and degrees of freedom dof = 16.

Enter T-value = 2.9
Enter Degrees of freedom = 16

and you get from the calculator
   
Right-tail value =  0.0052
Two-tailed distribution = 0.0104


notes on use of online calculators
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