# Troy Ounces to Pennyweights (oz t to dwt) Source: https://www.unitconvertercalculator.com/weight/troy-ounces-to-pennyweights/ **1 oz t = 20 dwt** One troy ounce equals exactly 20 pennyweights. This is a defining relationship of the troy system, designed for clean divisibility in precious metals commerce. The pennyweight, at one-twentieth of a troy ounce, is the standard unit for pricing gold jewelry in the American retail market. ## Formula Apply the conversion factor ## Conversion Table | Troy Ounces (oz t) | Pennyweights (dwt) | |---|---| | 0.1 oz t | 2 dwt | | 0.25 oz t | 5 dwt | | 0.5 oz t | 10 dwt | | 1 oz t | 20 dwt | | 2 oz t | 40 dwt | | 5 oz t | 100 dwt | | 10 oz t | 200 dwt | | 25 oz t | 500 dwt | | 50 oz t | 1000 dwt | | 100 oz t | 2000 dwt | | 250 oz t | 5000 dwt | | 500 oz t | 10000 dwt | | 1000 oz t | 20000 dwt | ## Units ### Troy Ounce (oz t) A troy ounce is a unit of mass used for precious metals such as gold, silver, and platinum. It equals exactly 31.1034768 grams, about 10% heavier than the common avoirdupois ounce. ### Pennyweight (dwt) A pennyweight is a unit of mass equal to 24 grains or 1/20 of a troy ounce (1.55517384 grams). Used in the jewelry trade for weighing precious metals. ## Background Every American gold buyer and pawn shop prices gold per pennyweight. A 14-karat gold ring weighing 3 pennyweights contains 3/20 of a troy ounce of total weight, with 14/24 of that being pure gold. This dual fraction system governs billions of dollars in annual gold jewelry transactions. ## Good to Know The 20-pennyweight troy ounce is the mathematical foundation of American gold retail. Every pawn shop, every gold buyer's advertisement, and every scrap gold calculator divides the troy-ounce gold price by 20 to get the pennyweight price, then adjusts for karat to offer a per-pennyweight buying price. This 20:1 ratio is the arithmetic that drives billions of dollars in annual gold jewelry transactions across America. ## FAQ ### How many pennyweights are in one troy ounce? Exactly 20 pennyweights make one troy ounce. This is a defining constant of the troy system, with no rounding involved. ### How do I convert troy ounces to pennyweights? Multiply troy ounces by 20. For example, 5 troy ounces equals exactly 100 pennyweights. ### Why is the pennyweight important? American gold buyers and pawn shops price scrap gold per pennyweight. Knowing the 20-dwt-per-troy-ounce ratio helps consumers verify that they are receiving fair prices for their gold. ## Non-Frequently Asked Questions ### If gold costs $2,200 per troy ounce, what does one pennyweight cost? One pennyweight of pure gold costs $110 (2,200 / 20). Jewelry gold is typically 10K to 18K, meaning 41.7 to 75 percent pure gold, so a pennyweight of jewelry gold contains $45.87 to $82.50 in pure gold value. This is the calculation every gold buyer performs dozens of times daily. ### Why is it called a pennyweight? Because it was historically the weight of one silver penny in medieval England: 24 grains or 1/240 of a troy pound. The British penny was literally worth its weight in silver, making the pennyweight both a weight unit and a monetary unit. Modern pennies are made of copper-plated steel and weigh considerably more than one pennyweight. ### Is 20 the cleanest number in precious metals? It shares the distinction with 12 (troy ounces per troy pound) and 24 (grains per pennyweight). Together, 20, 12, and 24 form the trinity of troy system divisors, all chosen for their exceptional divisibility properties. 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