This converts a measurement of mass from one set of units to another.

Units includes:

• (g) grams
• (oz) ounces
• (lb) pounds
• (ton_us) U.S. tons [short ton]
• (ton_uk) U.K. tons [long ton]
• (t) metric tons
• (me) mass of electron at rest
• (u) atomic mass unit
• (gr) grain
• (ct) carat
• (dwt) penny weight
• troy ounce