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I'm looking for a mortgage calculator webapp that will include monthly maintenance fees for apartment co-ops and condo complexes into its calculations.

Ideally, I'd like an app that will allow me to tweak all of the following: interest rate, down payment amount or percentage, apartment price, monthly maintenance fee, and total monthly payment (mortgage payment + monthly maintenance fee + estimated taxes). So, I'd like an app that will calculate forwards (entering the details about a given apartment and seeing what the monthly payments are going to be like) and backwards (entering the details about what I'd like to pay out monthly and seeing how much apartment I can get for that).

But, in a pinch, I'll happily use any calculator that will just add in the monthly maintenance fee for me.

Corcoran's mortgage calculator is close to what I'm looking for, but ideally I'd like the webapp to adjust the numbers 'live' as I change them, without my hitting 'calculate' over and over.

Anyone know of anything like this?

Update: It occurs to me that I could achieve something like this in a Google Docs spreadsheet... if only my spreadsheet-fu were stronger. Any ideas on that front?

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