As of Version 9.0, unit functionality is built into the Wolfram Language »
Details and Options
- To use Tun, you first need to load the Units Package using Needs["Units`"].
- Tun is equivalent to approximately 0.953923 Meter3 (SI units).
- Tun is equivalent to 4 Hogshead.
- Convert[n Tun,newunits] converts n Tun to a form involving units newunits.