Gold: Penny Weight Vs. Gram Weight
When weighing gold and other precious metals, you must use a different method or weights, called troy ounces. These are measured in units of pennyweights or gold grams.
1 Penny Weight
There are 20 pennyweights in a troy ounce, commonly abbreviated as DWT. The pennyweight was the actual weight of a medieval British silver penny and has remained the traditional method of weight for gold and other precious metals.
2 Gold Grams
There are 31.1 gold grams in a troy ounce.
3 Food and Postage Grams
In common food and postage weights, there are 28 g per ounce.
4 Troy Ounce
A troy ounce weighs about 10 percent more than 1 oz. of food and is used for weighing precious metals. It is called a troy ounce after the system of weights used in Troye, France, in medieval times.
5 Conversions
To convert gold grams to pennyweight, multiply by .64. To convert pennyweight to gold grams, multiply by 1.555.
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