udunits  2.2.28
About: UDUNITS supports units of physical quantities. Its C library provides for arithmetic manipulation of units and for conversion of numeric values between compatible units.
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udunits Documentation

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README 
This package provides support for units of physical quantities. Its main
components are:
    1) A C library, "libudunits2", for:
        a) Obtaining a binary unit from a string unit;
        b) Manipulating binary units arithmetically; and
        c) Obtaining a converter of numeric values between compatible binary
           units;
    2) A utility, "udunits2", for
        a) Obtaining the definition of a unit; and
        b) Converting a numeric value between compatible units; and
    3) An extensive database of units.