Needs feet+inches option!
6.56168 is meaningless to most people who use feet, like the whole USA. Fractional inches would be good too, such as 5 3/16", though that would require a more complex interface to allow fractional number entry and to allow the user to configure the desired fractional numerator for displaying results (32, 64 etc.)
BritTxTim about
Converter (unit conversions), v2.6.3