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Mass Unit Conversions 
For example, an astronaut would be almost weightless in outer space, but his or her mass would be unchanged from that on Earth. Therefore, one can say that mass is an expression of "how much stuff" something has. Here is a handy conversion calculator for some common and uncommon mass (weight) terms. Each term is defined in the next section.
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Unit  Equivalent measurements, comments 

Metric ton (t)  A metric ton is equal to 1,000,000 grams = 1,000 kilograms = 2,204 pounds = 1.102 U.S. short tons. 
Kilogram (kg, kilos)  The prefix "kilo" means 1,000, so there are 1,000 grams in a kilogram. One kg = 2.205 pounds. A cube of water 10 centimeters on each side has a mass of 1 kg. For the "official standard" see the links below. 
Gram (g, gm)  A gram is 1/1000th of a kilogram. A gram is equal to the mass of water contained in a cube one cm on each side (one cubic centimeter = 1 cc = 1 cm^{3} of water weighs 1 gram). 
Carat (c)  Used primarily for gemstones, one carat = 0.2 gram = 0.00705 ounce. There are 5 carats in a gram. 
Milligram (mg, mgs)  The prefix "milli" means 1/1000. Therefore, 1 milligram = 0.001 grams, or 1000 mg = 1 g. 1 mg = 1e6 kg. 1 mg = 3.52e5 ounces. 
Microgram (μg, μgs)  The prefix "micro" means 1/1,000,000 = 1e6. Therefore, 1 microgram = 0.001 milligram = 0.000001 grams, or 1,000,000 μg = 1 g. 1 μg = 1e9 kg. 
Nanogram (ng, ngs)  The prefix "nano" means 1/1,000,000,000 = 1e9, so 1,000,000,000 ng = 1e+09 ng = 1 g. 1 ng = 1,000 picograms. 1000 ng = 1 microgram. 1 ng = 1e12 kg. This unit, along with picogram, femtogram, attogram and zeptogram are unlikely to ever appear on an MSDS! 
Picogram (pg, pgs)  The prefix "pico" means 1/1,000,000,000,000 = 1e12, so 1,000,000,000,000 pg = 1e+12 pg = 1 g. 1 pg = 1,000 femtograms. 1000 pg = 1 nanogram. 1 pg = 1e15 kg. 
Femtogram (fg, fgs)  The prefix "femto" means 1/1,000,000,000,000,000 = 1e15, so 1,000,000,000,000,000 fg = 1e+15 pg = 1 g. 1 fg = 1,000 attograms. 1000 fg = 1 picogram. 1 fg = 1e18 kg. 
attogram (ag, ags)  The prefix "atto" means 1/1,000,000,000,000,000,000 = 1e18, so 1,000,000,000,000,000,000 ag = 1e+18 ag = 1 g. 1000 ag = 1 femtogram. 1 ag = 1e21 kg. For comparison, one atom of carbon weighs approximately 2e23 g so 50,000 atoms of carbon weigh roughly 1 attogram. 
Zeptogram (zg, zgs)  The prefix "zepto" means 1/1,000,000,000,000,000,000,000 = 1e21, so 1,000,000,000,000,000,000,000 zg = 1e+21 zg = 1 g. 1000 zg = 1 attogram. 1 zg = 1e24 kg. For comparison, one atom of platinum weighs approximately 3.02e22 g so 3 atoms of platinum weigh roughly 1 zeptogram. See also atomic mass unit. 
Ton (long ton)  In the U.S., a long ton = 1.12 short tons = 2,240 pounds = 1.016 metric tons. 
Ton (short ton)  In the U.S., a ton is 2,000 pounds = 907.18 kilograms = 0.907 metric tons. This is the "ton" that most Americans use. 
Pound (lb, lbs)  A pound is an English unit of weight. There are 16 ounces or 7,000 grains (a less common unit) or 453.592 grams in a pound. 
Ounce (oz, oz avdp)  An ounce is equal to 437.5 grains, 1/16 of a pound, or 28.350 grams. The system of having 16 ounces in a pound is called the avoirdupois system. Note:

Dram (dr, dr avdp)  Fairly uncommon. There are 256 drams in a pound. 1 dram = 27.34 grains = 1/16 ounces. Caution: apothecary drams and fluid drams are different from the avoirdupois dram (see previous entry). 
Grain (lb, lbs)  Fairly uncommon. There are 480 grains in a troy ounce and 7,000 grains in a pound. One grain = 64.799 milligrams = 0.324 carats. 
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Further Reading
See also: area units, distance units, energy units, mole, pressure units, temperature units, volume units. Additional definitions from Google and OneLook.
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Disclaimer: The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.