PURIX
AI characterWhat is an ounce?
The ounce is a unit of weight of English origin. The troy ounce is used as the international unit of weight for gold; this is the unit the news calls the “ounce”.23
In US measurement tables, 1 troy ounce is defined as 480 grains or 20 pennyweights. Because the metric equivalent of the grain is fixed, the gram equivalent of the troy ounce is also an exact number: 31.1034768 grams.1
Ounce and gram conversion table
| Ounces | Grams (approx.) |
|---|---|
| 1/2 ounce | 15.55 g |
| 1 ounce | 31.10 g |
| 2 ounces | 62.21 g |
| 10 ounces | 311.03 g |
| 32.15 ounces | 1,000 g (1 kg) |
The values in the table were multiplied by 31.1034768 grams and rounded to two decimal places. The value Borsa İstanbul uses is also 31.1035 grams; 1 kilogram is about 32.15 ounces.2
How do you calculate it?
Are the troy ounce and the everyday ounce the same?
No. The ounce in everyday use (the avoirdupois ounce) is 437.5 grains, i.e. 28.349523125 grams. The troy ounce, on the other hand, is 480 grains and 31.1034768 grams; in other words, it is about 10% heavier.1 Ekonomist’s dictionary also writes that the ounce can correspond to different weights from country to country, while for gold the troy ounce is used.2
So if a news item or a document mentions ounces and grams together, check whether the unit is the troy ounce.
The ounce tells you the weight, not the karat
Ounces and grams show only the weight. Karat and fineness tell you how much pure gold a piece contains. Karat isn’t guessed. It’s measured.
FAQ
How many grams is 1 ounce of gold?
1 troy ounce is exactly 31.1034768 grams; in everyday calculations about 31.10 grams is used.
How many ounces is 1 kilogram?
About 32.15 ounces.
Why is the troy ounce used for gold?
The international unit of weight for gold is the troy ounce; the everyday ounce is a lighter, separate unit.
How do you convert between ounces and grams?
You convert ounces to grams by multiplying by 31.1035, and grams to ounces by dividing by 31.1035.
Karat isn’t guessed. It’s measured.
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