Return to Compendium IndexReturn to Texas Antique Mall Precious Metal Weights There are 3 methods for measuring weight: 1. Avoirdupois is the system used for business/commerce and the most common. We've all seen the 5 lb. bag of potatoes. 2. Apothecaries is the system used by pharmacists (medicines). 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 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   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       Search Amazon.com for More Scales...click here If you've been thinking about collecting or investing in gold, visit www.goldcoins-silverbullion.com to see current gold values, gold information and excellent buys. FREE Online Tools for Calculating Ounces to Grams AND $$$ Value of Gold Jewelry For more information on gold and how to figure the gold content of your gold jewelry (14K, 18K) visit 'Gold'. Use of this page constitutes acceptance and understanding of Texas Antique Mall Terms & Conditions. Return to Compendium Index   Return to Texas Antique Mall Home