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Weights and Measures

Need to convert troy, avoirdupois, carat, and gram weight? These quick reference charts can help.

 

Troy Weight

Used in weighing precious metal.

 24 grains = 1 pennyweight (dwt)
20 dwt. = 1 ounce Troy
12 ounces = 1 pound Troy
5760 grains = 1 pound Troy
480 grains = 1 Troy oz.
1 kilogram = 2.68 pounds
1 kilogram = 32.15 Troy oz.
1 kilogram = 2.2046 lbs. Avoirdupois.
1 kilogram = 35.2740 oz. Avoirdupois
1 kilogram = 15,432 grains

Avoirdupois Weight

Used in weighing base metals

16 drams (or drachms) = 1 oz. Avoirdupois
16 ounces = 1 pound Avoirdupois
16 ounces = 7000 grains
28 pounds = 1 quarter English
4 quarters = 1 hundredweight (cwt.)
20 hundredweight = 1 ton Avoirdupois
1 pound Avoirdupois = 14.5833 Troy oz.
1 ounce Avoirdupois = 0.914 Troy oz.
1 pound Avoirdupois = 437.5 grains
1 pound Avoirdupois = .4359 kilo

Carat Weight

Used in weighing precious & semi-precious stones.

1 carat = 31/16 grains Troy
1 carat = .007 ounce Avoirdupois
1 carat = 1/5 gram

 

The carat is further divided into points for simple measurement:

1 carat = 100 points
1/2 carat = 50 points
1/ 4 carat = 25 points
1/8 carat = 12.5 points

Gram Weight

1gram = 15.43 grains Troy 
1.555 grams = 1 pennyweight
31.104 grams = 1 ounce Troy
28.35grams = 1 ounce Avoirdupois
1 grain = 0.0648 grams
1 grain = 64.80 milligrams
1 milligram = .015432 grams
1 gram = .035274 Avoirdupois oz.
1 gram = .032151 Troy oz.

 

Gold (Kt) Fineness

9K = 0.37500
10K = .41667
14K = .58500
18K = .75000
20K = .83340
22K = .91674
24K= 1.000

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