 Deutsche Version  prefixes | length | area | volume | pressure | temperature | time | energy | power | density | velocity | acceleration | force ● Conversions of weight and mass units ● Weight conversion m
This program converts English and American measures to metric units

 milligrams (mg): grams (g): kilograms (kg): tons (t):
 grains (gr): carats (ct): ounces (oz): pounds (lb): quarters (qu):
 short hundredweight: short tons: long hundredweight: long tons:

Conversions of many more weight and mass units

 1 long ton = 2240 lb exactly. (This amount is called a long ton in US customary units) 1 hundredweight = 112 lb exactly. (This amount is called a long hundredweight in US customary units) 1 ounce (oz) = 16 drams exactly = 437.5 grain exactly = 0.028 349 523 125 kg 1 pound (lb) = 16 oz exactly = 7000 grain exactly = 0.453 592 37 kg 1 grain (gr) = 64.79891 mg exactly 1 dram (dr) = 27.34375 grain exactly 1 scruple (s ap) = 20 grain exactly 1 pennyweight (dwt) = 24 gain exactly 1 dram apothecaries (dr ap) = 3 s ap exactly 1 ounce apothecaries (oz ap) or 1 ounce troy (oz t) = 8 dr ap exactly = 480 grain exactly 1 pound apothecaries (lb ap) or pound troy (lb t) = 5760 grain (gr)

Weight and mass units conversion chart

Sorted from light to heavy

 Name of mass unit, m Symbol Definition Relation to SI unit kg kilogram kg - kilogram = SI base unit electron rest mass me - ≈ 9.109 381 88×10−31 ±72×10−39 kg atomicunit of mass au - ≈ 9.109 381 88×10−31 ±72×10−39 kg unifiedatomic mass unit amu - ≈ 1.660 538 73×10−27 ±13×10−35 kg dalton Da - ≈ 1.660 902 10×10−27 ±13×10−35 kg gamma γ - ≡ 1 μg point - ≡ 1/100 kt (metric) = 2 mg mite - ≡ 1/20 gr = 3.239 945 5 mg mite (metric) - ≡ 1/20 g = 50 mg grain gr - ≡ 64.798 91 mg crith - - ≈ 89.9349 mg carat (metric) kt - ≡ 200 mg carat kt ≡ 3 1/6 gr ≈ 205.196 548 333 mg sheet - ≡ 1/700 lb av = 647.9891 mg scruple (avoirdupois) s av ≡ 20 gr = 1.295 978 2 g pennyweight dwt; pwt ≡ 1/20 oz t = 1.555 173 84 g dram (avoirdupois) dr av ≡ 27 11/32 gr = 1.771 845 195 312 5 g dram (apothecary; troy) dr t ≡ 60 gr = 3.887 934 6 g hyl (CGS unit) - ≡ 1 gee × 1 g × 1 s²/m = 9.806 65 g ounce (avoirdupois) oz av ≡ 1/16 lb = 28.349 523 125 g assayton (short) AT ≡ 1 mg × 1 sh tn ÷ 1 oz t ≈ 29.166 667 g ounce (apothecary; troy) oz t ≡ 1/12 lb t = 31.103 476 8 g assay ton (long) AT ≡ 1 mg × 1 long tn ÷ 1 oz t ≈ 32.666 667 g mark - ≡ 8 oz t = 248.827 814 4 g pond (troy) lb t ≡ 5760 grains = 0.373 241 721 6 kg pound (avoirdupois) lb av ≡ 7000 grains = 0.453 592 37 kg pond (metric) - - ≡ 500 g clove - ≡ 8 lb av = 3.628 738 96 kg stone st ≡ 14 lb av = 6.350 293 18 kg hyl (MKS unit) - ≡ 1 gee × 1 kg × 1 s²/m = 9.806 65 kg quarter (Imperial) - ≡ 1/4 long cwt = 2 st = 28 lb av = 12.700 586 36 kg slug; geepound slug ≡ 1 gee × 1 lb av × 1 s²/ft ≈ 14.593 903 kg bag (Portland cement) - ≡ 94 lb av = 42.637 682 78 kg short hundredweight; cental sh cwt ≡ 100 lb av = 45.359 237 kg long hundredweight long cwt or cwt ≡ 112 lb av = 50.802 345 44 kg bag (coffee) - ≡ 60 kg = 60 kg quintal (metric) q - ≡ 100 kg wey - ≡ 252 lb = 18 st = 114.305 277 24 kg long quarter - ≡ ¼ long tn = 254.011 727 2 kg kip kip ≡ 1000 lb av = 453.592 37 kg short ton sh tn ≡ 2000 lb = 907.184 74 kg tonne (mts unit) t - ≡ 1000 kg long ton long tn or ton ≡ 2240 lb = 1016.046 908 8 kg barge - ≡ 22 ½ sh tn = 20411.656 65 kg Zentner Ztr. ≡ 100 Pfund = 50 kg

In physics, the pound of mass is sometimes written lbm to distinguish it from the pound-force (lbf).
It should not be read as the mongrel unit "pound metre".

1 long ton = 2240 lb exactly. 1 hundredweight = 112 lb exactly.
1 ounce (oz) = 16 dr exactly = 437.5 gr exactly = 0.028 349 523 125 kg exactly
1 pound (lb) = 16 oz exactly = 7000 gr exactly = 0.453 592 37 kg exactly
1 grain (gr) = 64.79891 mg exactly
1 dram (dr) = 27.34375 gr exactly
1 scruple (s ap) = 20 gr exactly
1 pennyweight (dwt) = 24 gr exactly
1 dram apothecaries (dr ap) = 3 s ap exactly
1 ounce apothecaries (oz ap) or ounce troy (oz t) = 8 dr ap exactly = 480 gr exactly
1 pound apothecaries (lb ap) or pound troy (lb t) = 5760 grain (gr)

In physics, the pound of mass is sometimes written lbm to distinguish it from the pound-force (lbf).
It should not be read as the mongrel unit "pound metre".

 Unit Comments to distance, length, width, breath, and height measures 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. 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 cm3 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 = 10-6 kg. 1 mg = 3.52·10−5 ounces. Microgram (mg, mgs) The prefix "micro" means 1/1,000,000 = 10−6. Therefore, 1 microgram = 0.001 milligram = 0.000001 grams, or 1,000,000 mg = 1 g. 1 mg = 10-9 kg. Nanogram (ng, ngs) The prefix "nano" means 1/1,000,000,000 = 10−9, so 1,000,000,000 ng = 109 ng = 1 g. 1 ng = 1,000 picograms. 1000 ng = 1 microgram. 1 ng = 10−12 kg. Picogram (pg, pgs) The prefix "pico" means 1/1,000,000,000,000 = 10−12, so 1,000,000,000,000 pg = 1012 pg = 1 g. 1 pg = 1,000 femtograms. 1000 pg = 1 nanogram. 1 ng = 10−15 kg. Femtogram (fg, fgs) The prefix "femto" means 1/1,000,000,000,000,000 = 10−15, so 1,000,000,000,000,000 fg = 1015 pg = 1 g. 1 fg = 1,000 attograms. 1000 fg = 1 picogram. 1 fg = 10−18 kg. Attogram (ag, ags) The prefix "atto" means 1/1,000,000,000,000,000,000 = 10−18, so 1,000,000,000,000,000,000 ag = 1018 ag = 1 g. 1000 ag = 1 femtogram. 1 ag = 10−21 kg. For comparison, one atom of carbon weighs approximately 2·10−23 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 = 10−21, so 1,000,000,000,000,000,000,000 zg = 1021 zg = 1 g. 1000 zg = 1 attogram. 1 zg = 10−24 kg. For comparison, one atom of platinum weighs approximately 3.02·10−22 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: An ounce is a unit of weight that is not equal to a fluid ounce which is a measure     of volume. The troy or apothecary weight system has one ounce = 480 grains = 31.103 grams     and 12 ounces = 1 pound. That means one avoirdupois ounce is equal to     0.910 troy ounce. 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. 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.