Trying to figure out how many 15pt into cups?

In 1 pint there are 2 cups.

Therefore, in 15 pints there are 30 cups.

You should use the chart and keep it somewhere safe so you can always see it in case you need it, but I will give you this answer for now ...

There's a big G (gallons), then in that G there are 4 q's (quarts), in each of those q's there's 2 p's (pints), and in each of the p's there's 2 c's (cups).

I'll leave a link in the comments to that chart if you want to copy it down or print it out.