# Pennyweights to Troy Ounces (dwt to oz t) Source: https://www.unitconvertercalculator.com/weight/pennyweights-to-troy-ounces/ **1 dwt = 0.05 oz t** One pennyweight equals exactly 0.05 troy ounces, or equivalently, there are exactly 20 pennyweights in one troy ounce. This is one of the cleanest conversions in the troy weight system, reflecting the system's deliberate design around highly divisible numbers. Jewelers and gold dealers use this relationship constantly when translating between the two most common troy units. ## Formula Apply the conversion factor ## Conversion Table | Pennyweights (dwt) | Troy Ounces (oz t) | |---|---| | 0.5 dwt | 0.025 oz t | | 1 dwt | 0.05 oz t | | 2 dwt | 0.1 oz t | | 5 dwt | 0.25 oz t | | 10 dwt | 0.5 oz t | | 20 dwt | 1 oz t | | 40 dwt | 2 oz t | | 50 dwt | 2.5 oz t | | 100 dwt | 5 oz t | | 200 dwt | 10 oz t | | 240 dwt | 12 oz t | | 500 dwt | 25 oz t | | 1000 dwt | 50 oz t | | 5000 dwt | 250 oz t | ## Units ### 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. ### 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. ## Background Every gold buyer and jeweler knows that 20 pennyweights equal one troy ounce. When gold spot prices are quoted per troy ounce, dividing by 20 gives the approximate price per pennyweight. This mental shortcut is performed thousands of times daily across gold shops, pawn stores, and precious metals exchanges throughout North America. ## Good to Know The 20-pennyweight troy ounce is one of the most enduring measurement definitions in Western commerce. It has remained unchanged since its standardization in medieval Troyes, surviving the rise and fall of empires, the invention of the metric system, and the digitization of global markets. Gold dealers in 2024 quote the same 20-pennyweight troy ounce that French merchants used 800 years ago. ## FAQ ### How many pennyweights are in one troy ounce? There are exactly 20 pennyweights in one troy ounce. This is a definitional relationship, not an approximation. The troy ounce is defined as 20 pennyweights or 480 grains. ### How do I calculate gold price per pennyweight from the spot price? Divide the troy ounce spot price by 20 to get the price per pennyweight. For example, if gold is $2,200 per troy ounce, one pennyweight of pure gold is worth $110. For karat gold, multiply by the karat fraction (e.g., 14K = 14/24 = 0.583 of the pure gold price). ### Why are there exactly 20 pennyweights per troy ounce? The troy ounce was defined as 20 pennies' weight because 20 was a common counting base in medieval English commerce (similar to how 20 shillings made one pound sterling). This made the troy ounce easy to subdivide for everyday precious metals transactions. ## Non-Frequently Asked Questions ### Is 20 pennyweights per troy ounce the most satisfying number in the troy system? It competes with 24 grains per pennyweight and 12 troy ounces per troy pound for the title. All three are clean, highly divisible numbers chosen by medieval merchants who valued mental arithmetic. The number 20 is especially appealing because it allows easy division into halves, quarters, fifths, and tenths, covering most practical transaction fractions. ### If gold costs $2,200 per troy ounce, how much is the gold in my tooth filling? A typical gold dental filling contains about 1 to 3 pennyweights of gold. At $2,200 per troy ounce ($110 per pennyweight), your filling contains about $110 to $330 worth of gold. This is why some enterprising dentists offer to buy back old fillings, and why patients occasionally joke about their mouths being more valuable than their wallets. ### Could I subdivide a troy ounce coin into 20 pennyweight pieces? Physically, yes, but you would destroy the coin's numismatic value, which is typically far more than its gold content. A one-troy-ounce Gold Eagle coin is worth $2,200+ in gold but can sell for more as a collectible. Cutting it into 20 pennyweight pieces would give you 20 oddly-shaped gold fragments worth less together than the intact coin. ## Related Articles - [Why We Measure: The Deepest Urge in Human Civilisation](https://www.unitconvertercalculator.com/blog/why-we-measure) - [The Map Is Not the Territory: Why Every Measurement Is Wrong](https://www.unitconvertercalculator.com/blog/the-map-is-not-the-territory) - [Zero: The Most Dangerous Number in Measurement](https://www.unitconvertercalculator.com/blog/zero-the-most-dangerous-number-in-measurement) - [The Kilogram Problem: The Object That Was Its Own Definition](https://www.unitconvertercalculator.com/blog/the-kilogram-problem) - [The Body as a Ruler: Every Measurement Unit That Came From Us](https://www.unitconvertercalculator.com/blog/the-body-as-a-ruler) - [Why Your Recipe Is Lying to You: The Chaos of Cooking Measurements](https://www.unitconvertercalculator.com/blog/why-recipe-measurements-are-unreliable) - [15 Obscure Measurement Units You've Never Heard Of (But Still Need)](https://www.unitconvertercalculator.com/blog/obscure-measurement-units-guide) - [When Measurements Go Wrong - Disasters, Blunders and Happy Accidents](https://www.unitconvertercalculator.com/blog/when-measurements-go-wrong) - [The Surprising Stories Behind Everyday Units of Measurement](https://www.unitconvertercalculator.com/blog/stories-behind-measurement-units) - [Metric vs. Imperial - The Complete Guide to the World's Two Measurement Systems](https://www.unitconvertercalculator.com/blog/metric-vs-imperial-complete-guide) - [Understanding Weight Units - Kilograms, Pounds, Stones & Ounces](https://www.unitconvertercalculator.com/blog/understanding-weight-units) - [Complete Baking Measurement Guide - Cups, Grams, Ounces](https://www.unitconvertercalculator.com/blog/baking-measurement-guide) ## See Also - [Troy Ounces to Pennyweights](https://www.unitconvertercalculator.com/weight/troy-ounces-to-pennyweights/)