T-Distribution Table

Find critical t-values for any degrees of freedom and significance level, one- or two-tailed.

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Usually n − 1 for one sample
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Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.

Common critical values (two-tailed)

dfα = 0.10α = 0.05α = 0.01
16.31412.70663.657
22.9204.3039.925
32.3533.1825.841
42.1322.7764.604
52.0152.5714.032
101.8122.2283.169
151.7532.1312.947
201.7252.0862.845
251.7082.0602.787
301.6972.0422.750
601.6712.0002.660
1201.6581.9802.617

As df grows, t approaches the normal z-value (1.960 for α = 0.05). Values are computed from the Student’s t distribution (regularized incomplete beta function), not copied from a printed table.

Frequently asked questions

What is the t critical value for df = 10 at 95%?

2.228 (two-tailed).

When do I use t instead of z?

When the population standard deviation is unknown and you estimate it from a sample, especially for small samples.

About this tool

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Last updated
31 Oct 2026

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