The units of measure used in this tool are the following:
o  h: The hour is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 seconds. 
o  min: A minute is a unit of measurement of time. The minute is a unit of time equal to 1/60th of an hour or 60 seconds. 
o  s: The second is a unit of measurement of time, and is the International System of Units (SI) base unit of time. 
o  m: The metre (or meter) is the base unit of length in the International System of Units (SI). 
o  cm: A centimetre (American spelling: centimeter) is a unit of length in the metric system, equal to one hundredth of a metre, which is the SI base unit of length. 
o  km: The kilometre (American spelling: kilometer) is a unit of length in the metric system, equal to one thousand metres. 
o  L: The litre (or liter) is a unit of volume equal to 1 cubic decimetre (dm3), to 1,000 cubic centimetres (cm3), and to 1/1,000 cubic metre. 
o  m3: The cubic metre (US spelling: cubic meter) is the SI derived unit of volume. It is the volume of a cube with edges one metre in length. 
o  kg: The kilogram or kilogramme is the base unit of mass in the International System of Units. 
o  t: The ton is a unit ofmass equal to 1,000 kilograms (kg). 
