Description:

Math::Calc::Units is a simple calculator that keeps track of units. It
currently handles combinations of byte sizes and duration only,
although adding any other multiplicative types is easy. Any unknown
type is treated as a unique user type (with some effort to map English
plurals to their singular forms).

The primary intended use is via the ucalc script that prints out all
of the "readable" variants of a value. For example, "3 bytes" will
only produce "3 byte", but "3 byte / sec" produces the original along
with "180 byte / minute", "10.55 kilobyte / hour", etc.