Here are some online calculators for you to use:

What would my payments be for an adjustable rate loan?

What would my payments be for a balloon loan?

Should I rent my home or buy?

Which loan is better, Fixed or Adjustable?

What would I save if I make extra payments?

How much house can I qualify for?

Advanced mortgage calculator.

Sellers Netsheet.

Buyers Netsheet.

FHA calculator.

VA calculator.