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First, 1 inch is 2.54 cm. 1 cm is not 2.54 inches.
If you are going to enter more than one value (length and width) in your example, they should be entered into different fields--in some cases into different records of a related table even, if you need to support varying numbers of terms in your calculation.
You could rewrite the calculation to check for multiple terms and evaluate the text that you entered as a calculation, converting the result into inches but that seems a needless complication here.
oops!! Thanks for the correction!!
ah ok, I will create some more fields in that case