Example for bad user interface
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Here is an example to learn how not to do an user interface. Things are made complex by adding the slider controls and unreadable scale and do not forget to look the accuracy after the decimal point.
All that was required was textbox controls for user to input data and validate the data at the background. Incidentally Moneycontrol.com is finance and stock advisory site. I wonder how they complicate other informations to the user!
Finally do not forget to read the notice here!
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Good
Now that is simpler!
http://www.hdfc.com/calculator/emical.asp
try this