html – Should I have a form or two separate forms?

I have two forms (below), one is a travel calculator and the other, a pocket money calculator, which are very distressing because of the number of dollars. 39, events that users can calculate.

There is a pocket money radio on the trip calculator (if you click "yes", the pocket money calculator will open in a new tab, feature not yet added) .

From a friendliness point of view, should I:

Leave the two calculators separate because they are already big enough visually OR
Add a conditional section to the main calculator where, if you clicked Yes, the spending money calculator will open on the same page as the main calculator, which will lengthen the calculator if it is open?

http://tripcalculator.travel2mania.com/WrestleMania.php

http://spendingcalculator.travel2mania.com/WrestleManiaspending.php