this one.
https://www.cardschat.com/poker-odds-calculator.php
first you need to know the possibility of each results going to happen.
the equity = possibility of that kind of result happen X[multiple] the amount you and your opponent put into that kind of result.
in your case.
your winning chance 48.48%
your losing chance 51.52%
possible chance to split pot= 0%
if the original pot is 100
you both agree to put nothing into the pot
the equity is
equity= 100*48.48%-100*51.52%= what ever
if you both agree to put an extra 50 into pot
equity = (100+50*2)*48.48%-(100+50*2)*51.52%= what ever.
similar way.
good luck.