How do I get a p-value from the test statistic?

I am testing, H0: µ = µ0 versus H1: µ ≠ µ0 (so it's a two-tailed test). The degrees of freedom is 19 and I am given a few t scores. I need to calculate the p-value for each test statistic. I was using a t distribution table but I was getting a range for the p-value. I feel like that's not right and I should just be getting a single value. Say for instance, I have a t = 2.1. How would I get a p-value from that? If anyone could help, I would really appreciate it. Thanks!