Precious Metal Weights There are 3 methods for measuring the weight of precious metals: 1. Apothecaries is the system used by pharmacists (medicines). 2. Avoirdupois is the system used for business/commerce and the most common. We've all seen the 5 lb. bag of potatoes. 3. Troy is the traditional system used for measuring precious metals such as gold, silver, platinum and the one we will be looking into on this page. BASIC STANDARD WEIGHTS USED FOR PRECIOUS METAL COMMERCE CONVERSION TABLE  Standard (Avordupois) ounce to Troy ounce multiply by .91  Standard (Avordupois) ounces to pennyweight multiply by 18.2  Standard (Avordupois) ounces to grams multiply by 28.35  Troy ounces to pennyweight multiply by 20  Troy ounces to pounds troy, divide by 12  Pennyweight to grams multiply by 1.56  Pennyweight to troy ounces multiply by .05 (or divide by 20)  Grams to pennyweight multiply by .64  Grams to troy ounces multiply by .032 TROY OUNCES  12 Troy ounces = 1 Troy pound  1 troy ounce = 480 grains  1 troy ounce = 20 pennyweights (dwt)  1 troy ounce = 1.097 ordinary (Avoirdupois) ounce  1 troy ounce = 31.1034768 grams  14.583 troy ounces = 1 ordinary (Avoirdupois) pound  32.15 troy ounces = 1 kilogramme PENNYWEIGHTS (DWT)     1 pennyweight = 24 grams     1.55 grams = 1 pennyweight     20 pennyweight = 1 troy ounce     240 pennyweight = 1 troy pound     24 grains = 1 pennyweight     1 pennyweight = .05 troy ounce     1 gram = .643 pennyweight GRAM  1 gram = .03215 troy ounce  1 gram = .643 pennyweight  1.55 grams = 1 pennyweight

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