Binary Fixed Point calculations with Ruby. fixedpnt allows simulating binary fixed point calculations done in hardware. If you want to know what fixed point numbers are, you can read this: http://en.wikipedia.org/wiki/Fixed-point_arithmetic There is another library from Phil Tomson which serves the same purpose but with different properties: http://rubyforge.org/projects/fixedpt/ For _decimal_ fixed point calculations there is at least the library from Karl Brodowsky: http://rubyforge.org/projects/long-decimal/