Conversion tables for metric and imperial units

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### Factors for Converting Units of Mass

The factors in the tables below can be used to convert between units of mass or weight which are used in different parts of the world. Also old publications give units which are no longer used, so when preparing recipes or making up insecticides or weedikillers the correct amount can be found.
There is a great deal of interest at present in the Body Mass Index and the relationship to health. It is an expression of body weight in relation to height,, above certain levels the risk of heart disease and diabetes increases.
Use these links to other pages of conversion factors.

The calculator below can be dragged around with your mouse for working out your conversion.
 Calculator floats on page drag and operate with mouse. One operation at a time, for chain calculations clear result and re-enter for next stage.

### Useful Weight Relationships

Imperial which uses Auoirdupois Weight
16 drams = 1 ounce (oz)
16 ounces = 1 pound (lb)
14 pounds = 1 stone (st)
28 pounds = 1 quarter (qr.)
4 quarters (112 pounds) = 1 hundredweight (cwt.)
20 hundredweight = 1 ton = 2240 lb (long).

Metric
1 kilogram = 1000 grams
1 tonne = 1000 kilograms
1 metric carat = 200 milligrams

Troy Weight
3.17 grains = 1 carat
24 grains = 1 pennyweight (dwt.)
20 pennyweights = 1 ounce
12 ounces = 1 pound
100 pounds = 1 hundredweight

NB. The carat is the proportion of gold in the alloy used to make a article of jewellery. Articles are taken to consist of 24 carats and are quoted to contain 9, 15, 18 or 22 carats of gold, eg. one stamped 9 carats has 9 parts gold and 15 parts alloy. (A sovereign is 22 carat gold).

Apothecaries' weight - used in old Medical prescriptions
20 grains = 1 scruple ()
3 scruples = 1 drachm ()
8 drachms = 1 ounce ()
12 ounces = 1 pound.

Density - It is sometimes useful to know the weight of material when the volume required is known, This can be calculated from the Density
 Density = Mass spaceee Volume so Mass = Density x Volume.

 Some density values Concrete 2242 kg/m3 Copper - pure 8900 kg/m3 Iron 7830 kg/m3 Sand 2650 kg/m3 Water (4 C) 999.97 kg/m3 White pine 513.00 kg/m3

### Mass (Weight) Conversion Factors

 from to multiply by grains (gr) grams (g) 0.0647 grams grains 15.432 ounces (oz) (avoirdupois) grams 28.35 grams ounces (avoirdupois) 0.0353 grams ounces (troy) 0.0322 ounces (troy) grams 31.1 pounds (lb) grams 453.592 pounds (lb) kilograms (kg) 0.4536 kilograms (kg) pounds (lb) 2.2046 stones kilograms (kg) 6.3503 quarters kilograms (kg) 12.7006 hundredweights kilograms 50.8023 tons (GB) kilograms 1016.05 tons (USA) kilograms 907.2 tons (GB) tonnes 1.0160 tonnes tons (long 2240 lb) 0.9842 tonnes tons (short 2000 lb) 1.1023

For the more health conscoius here are a couple of Body Mass Index (BMI) calculators

Metric
Weight (in Kilograms) Height (in Centimetres)

BMI
Imperial or USA, with a comment from the Panel on Energy, Obesity, and Body Weight Standards on your health category, published by the American Journal of Clinical Nutrition.
 Weight: lbs. Height: Ft. In. BMI

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