Andy's right. The regulators have shown a surprising interest in web calculators. If you're going to use them, be sure you agree with the results and be sure someone in the bank can explain them to customers who will challenge the calculations. In addition, I'd track the useage of any calculator you put on the site. If some are not getting any use and others are, get rid of the dead wood so customers can find the good stuff more easily.
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...gone fishing.