I have been given a formula for calculating a t test statistic as

$$t_{n-1} = \frac{ \bar{x}- \mu_0}{\frac{S}{\sqrt{n}}} $$

Where $\bar{x}$ is the sample mean, $\mu_0$ is the hypothetical true mean, $S$ is the sample standard deviation and $n$ is the sample count.

But when I plug my values in, the outcome is negative.

I don't see how to look up a negative value on the T-table. Should I be taking the absolute value?