Temperature Conversion, Weight Conversion and Length Conversion. Convert numbers into words (from 0 to 999,999,999,999,999) Dollars and Cents, integers or decimal fractions. Convert percent to microgram/gram. Pounds to kilo converter - A calculator to convert pounds to kilo. Feet and Inches Calculator. Additional InformationOnly in the imperial system of measures are mixed units "allowed".That is, measurements like 19 feet 4 inches17 miles 13 yards 2 feet5 pounds 7 ounces3 tons 5 hundredweights 2 stonesetc In the SI or metric system mixed measures are "not allowed", and they are certainly not necessary. Something like 15 metres 78 centimetres 3 millimetres is expressed as 15.783 metres and it is so easy with a system which is based on powers of 10. Perhaps it should be added that, although reference has been made here to the awkward nature of the imperial system, the measuring systems of nearly all other cultures and times have the same underlying fault in their mixed systems.