Loan Calculator - a general purpose loan calculator. Calculates any one of the four variables associated with a loan.
Markup and Discount Calculator - use this calculator to calculate markups and discounts. You can solve for any of five unknowns. Also a great tool for teaching about percentages.
Mortgage Calculator - calculates any loan detail plus the price of the home you can afford or the down payment amount required.
Payment Required Calculator - a classic, how much do I have to save to be a multi-millionaire? Calculates the reqular savings amount needed to reach any future value, not just a million dollars.