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Hi Robin,
This program is very flexible easy-to-use yet powerful calculator that currently targets general math but we have plans for finance/mortgage specific calculations as well. Although currently it does not have a build-in interest amount function, you could easily define your own. For example type:

MonthlyPayment(load, interest, years) = load*(interest*(1 + c)*years)/((1 + interest)*years - 1)

then use it like this:
MonthlyPayment(100000, 0.05, 25)

to calculator monthly payment of 100,000 loan for 5% interest over 25 years.

As per formulas found here:

http://www.mtgprofessor.com/formulas.htm

i thought i could use this to calculate a loan repayment schedule with interest, variable payments and a balloon - did i download the wrong program or is that math here somewhere and i don't know it?
rb

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