Unit of Measure Conversions

Mass

Mass (weight) Conversions

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Additional Units and Information

* At conditions of maximum density: 4°C (39.2°F) and 1 atm pressure
Name Symbol Value Description/Notes
carat ct   A measure of the purity of gold, expressed as parts of gold in 24. E.g. 18 ct gold contains 18 parts in 24, having a "fineness" of 750
(metric) carat ct 100 points;
200 milligrams 		A measure of gemstone size
metric slug hyl;
mug;
TME		 9.80665 kilograms Mass that accelerates at 1 m/s² when acted upon by 1 kgf
milligram mg 1/1000 gram  
quarter   2 stones;
¼ hundredweight 		 
short ton   2,000 pounds  
slug sl 32.174 pounds Mass that accelerates at 1 ft/s² when acted upon by 1 lbf
    10.0224 pounds Mass of 1 UK gallon of pure water*
    1 kilogram Mass of 1 litre of pure water*

Troy Weights

* Avoirdupois
Name Symbol Value Description/Notes
grain gr 0.064799 gram;
1/7000 pound* 		15.432337 grains per gram;
437½ grains per ounce*
scruple   20 grains;
1.295978 grams 		 
pennyweight dwt 24 grains;
1.555174 grams;
1/20 troy ounce 		 
drachm dr 60 grains;
3 scruples;
3.887935 grams 		Also called "dram"
troy ounce ozt 480 grains;
24 scruples;
8 drachms;
31.103477 grams 		1.097143 ounces*

Useful Approximations

Approximation % Accuracy
1 kilogram ≈ 2.2 pounds 99.8
70 kilograms ≈ 11 stones 99.8
1 long ton ≈ 1 tonne 98.4