A troy ounce is exactly 31.1034768 grams.
Troy ounces to Grams Converter — oz t to g
Convert Troy ounce (oz t) to Gram (g) using the exact conversion factor (1 troy ounce = 31.1034768 gram). See the formula, worked examples, conversion table, history, and common uses.
Troy ounces to Grams converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A gram is one thousandth of a kilogram.
Result = input x 0.0311034768 / 0.001.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Grams
Weight conversions between Troy ounce and Gram come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A troy ounce is exactly 31.1034768 grams, and a gram is one thousandth of a kilogram.
Formula
grams = troy ounces × 31.1034768
This factor comes from each unit's defined relationship to the category's base unit: 1 troy ounce equals 0.0311034768 base units, and 1 gram equals 0.001 base units, so dividing one by the other gives the direct troy ounce-to-gram factor of 31.1034768.
Simple example
1 oz t × 31.1034768 = 31.1034768 g
1 troy ounce = 31.1034768 grams.
Real-world example
50 oz t × 31.1034768 = 1,555.17384 g
50 troy ounces = 1,555.17384 grams.
Conversion table
| Troy ounce (oz t) | Gram (g) |
|---|---|
| 1 oz t | 31.1034768 g |
| 5 oz t | 155.517384 g |
| 10 oz t | 311.034768 g |
| 25 oz t | 777.58692 g |
| 50 oz t | 1,555.17384 g |
| 100 oz t | 3,110.34768 g |
Reverse conversion: Gram to Troy ounce
31.1034768 g × 0.03215074657 = 1 oz t
31.1034768 grams = 1 troy ounces.
troy ounces = grams × 0.0321507465686
For a page dedicated to this direction, see Gram to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Gram
Gram (g) measures mass. A gram is one-thousandth of a kilogram, the SI base unit of mass. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small-mass unit worldwide
Uses of the Gram today
- Cooking and nutrition labeling worldwide (including in the US, alongside ounces)
- Precious metal and small-item weighing
- Scientific and laboratory measurement
History of the Gram
Originally defined in 1795 as the mass of one cubic centimeter of water, the gram follows directly from the kilogram (1/1000 of it) under the modern SI system, inheriting the kilogram's various historical and current definitions.
Historical origin. Gram was not the invention of a single named person; it developed through the process described above.
Gram — sources
- BIPM — The kilogram (SI base unit) — Basis for the gram as 1/1000 of the kilogram.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grams are in 1 troy ounce?
1 troy ounce equals 31.1034768 grams, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to gram?
Multiply the troy ounce value by 31.1034768. The converter above does this instantly to whatever precision you set.
How do I convert gram back to troy ounce?
Use the reverse factor: 1 gram equals 0.0321507466 troy ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
What is a gram?
Gram (g) measures mass. A gram is one-thousandth of a kilogram, the SI base unit of mass. It is classified as a SI derived (metric prefix) unit.
Is the troy ounce to gram conversion exact?
Yes. Both troy ounce and gram are defined by fixed standards rather than physical artifacts, so the factor of 31.1034768 used above is exact to as many digits as you choose to display.