A simple calculator that generates a P Value from a T score.

April 13, 2025 - This calculator finds the p-value associated with a given t-score and a degrees of freedom.

Free web calculator provided by GraphPad Software. Calculates the P value from z, t, r, F, or chi-square.

Normal Distribution Chi-Square Distribution t Distribution F Distribution · P-Value Calculator for t Distribution

Performs unpaired t test, Weldh's t test (doesn't assume equal variances) and paired t test. Calculates exact P value and 95% confidence interval. Clear results with links to extensive explanations.

June 25, 2023 - Once we know the value of t, we can use statistical software or an online calculator to find the corresponding p-value. If the p-value is less than some alpha level (common choices are .01, .05, and .10) then we can reject the null hypothesis and conclude that the mean height of the plants is not equal to 15 inches. However, it’s also possible to estimate the p-value of the test by hand using a t-Distribution table.

The p-value represents the probability associated with the given z-score. ... Enter the t-score value into the designated input field. Enter the degrees of freedom (df) into the respective field. Select the desired significance level (α) from the dropdown menu.

Input your T-score, and degrees of freedom, select your test type (one-tailed or two-tailed), and choose your significance level. The calculator will give you the P-Value and explain whether the null hypothesis can be rejected.

March 29, 2021 - If you are interested in finding the t critical value for a given significance level, degrees of freedom, and type of test (one-tailed or two-tailed), then you should use the t distribution table. Instead, if you have a given test statistic t and you simply want to know the p-value of that test statistic, then you would need to use a T Score to P Value Calculator to do so.

This calculator will tell you the one-tailed and two-tailed probability values of a t-test, given the t-value and the degrees of freedom.

This p value calculator allows you to convert your t statistic into a p value and evaluate it for a given significance level. Simply enter your t statistic (we have a t score calculator if you need to solve for the t score) and hit calculate.

t Table · cum. prob · t .50 · t .75 · t .80 · t .85 · t .90 · t .95 · t .975 · t .99 · t .995 · t .999 · t .9995 · one-tail · 0.50 · 0.25 · 0.20 · 0.15 · 0.10 · 0.05 · 0.025 · 0.01 · 0.005 · 0.001 · 0.0005 · two-tails · 1.00 · 0.50 ·

« Back You can easily find the p value from a t value with our online calculator. If you want to find the p value by using a table with critical t values, instructions are given below.

The t-distribution table (or Student’s t-table) provides critical values for the t-distribution, primarily used in hypothesis testing and confidence intervals. The critical t-value can be found in the table below for a chosen significance level, typically alpha=0.05. If the calculated t-value ...

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January 20, 2016 - The p-value calculator can help you find the p-value and evaluate how compatible your data is with the null hypothesis.

October 3, 2025 - If you don't know them, provide some data about your sample(s): sample size, mean, and standard deviation, and our t-test calculator will compute the T-score and degrees of freedom for you. Once all the parameters are present, the p-value, or critical region, will immediately appear underneath the t-test calculator, along with an interpretation!

Table 1 (cont’d). One-sided P-values from t() distribution: P[t() > u].

June 21, 2023 - Multiply the critical value of t by s/√n. Add this value to the mean to calculate the upper limit of the confidence interval, and subtract this value from the mean to calculate the lower limit.