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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