From: Joseph Wright [[log in to unmask]] In terms of input range, I've gone for -999999999.999999999 to +999999999.999999999. This should be sufficient for a wide range of purposes (for example, if you convert a dimen into a floating point number in units pt then you are safe for any dimen TeX can handle). ==== Please would you clarify for me, Joseph. Does this package provide floating point numbers, as described in: http://en.wikipedia.org/wiki/Floating_point From what you've written above it seems that your implementing fixed point. http://en.wikipedia.org/wiki/Fixed-point_arithmetic namely "a fixed number of digits after (and sometimes also before) the radix point". -- Jonathan -- The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England & Wales and a charity registered in Scotland (SC 038302).