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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.
Length Area Volume Miscellaneous

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).

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  
Copper - pure8900kg/m3
Water (4 C)999.97kg/m3
White pine513.00kg/m3

Mass (Weight) Conversion Factors

fromtomultiply by
grains (gr)grams (g)0.0647
ounces (oz) (avoirdupois)grams28.35
gramsounces (avoirdupois)0.0353
gramsounces (troy)0.0322
ounces (troy)grams31.1
pounds (lb)grams453.592
pounds (lb)kilograms (kg)0.4536
kilograms (kg)pounds (lb)2.2046
stones kilograms (kg)6.3503
quarterskilograms (kg)12.7006
hundredweightskilograms 50.8023
tons (GB)kilograms1016.05
tons (USA)kilograms907.2
tons (GB)tonnes1.0160
tonnestons (long 2240 lb)0.9842
tonnestons (short 2000 lb)1.1023

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

Weight (in Kilograms) Height (in Centimetres)

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.
Top ^ Length Area Volume MiscellaneousCalculator

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