How do you calculate how much principal you've paid off and home equity you have?

[Varika Pinnam]

Listening to one of Brandon Turner's books and he mentions this (https://www.biggerpockets.com/blog/plan-to-make-a-million)
My question is how do you calculate your loan paydown for the principal and how much equity you've built up?
I know I can look at an amortization schedule, but I am guessing there has to be a simpler way to quickly estimate the numbers - can't find a decent online calculator for this

Appreciate any help - thanks!