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|  | ● Conversions of weight and mass units ● Weight conversion m | 
Conversion: units of volume, measures of capacity, and the weight of water
Conversion: milliliter in liter and liter in milliliter and more
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: of volume. 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. | 
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