A troy ounce is exactly 31.1034768 grams.
Troy ounces to Grains Converter — oz t to gr
Convert Troy ounce (oz t) to Grain (gr) using the exact conversion factor (1 troy ounce = 480 grain). See the formula, worked examples, and conversion table.
Troy ounces to Grains 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 grain is exactly 64.79891 milligrams.
Result = input x 0.0311034768 / 6.479891e-5.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Grains
Weight conversions between Troy ounce and Grain 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 grain is exactly 64.79891 milligrams.
Formula
grains = troy ounces × 480
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 grain equals 0.00006479891 base units, so dividing one by the other gives the direct troy ounce-to-grain factor of 480.
Simple example
1 oz t × 480 = 480 gr
1 troy ounce = 480 grains.
Real-world example
50 oz t × 480 = 24,000 gr
50 troy ounces = 24,000 grains.
Conversion table
| Troy ounce (oz t) | Grain (gr) |
|---|---|
| 1 oz t | 480 gr |
| 5 oz t | 2,400 gr |
| 10 oz t | 4,800 gr |
| 25 oz t | 12,000 gr |
| 50 oz t | 24,000 gr |
| 100 oz t | 48,000 gr |
Reverse conversion: Grain to Troy ounce
480 gr × 0.002083333333 = 1 oz t
480 grains = 1 troy ounces.
troy ounces = grains × 0.00208333333333
For a page dedicated to this direction, see Grain to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains are in 1 troy ounce?
1 troy ounce equals 480 grains, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to grain?
Multiply the troy ounce value by 480. The converter above does this instantly to whatever precision you set.
How do I convert grain back to troy ounce?
Use the reverse factor: 1 grain equals 0.0020833333 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 grain?
Grain (gr) is a unit of mass/weight.
Is the troy ounce to grain conversion exact?
Yes. Both troy ounce and grain are defined by fixed standards rather than physical artifacts, so the factor of 480 used above is exact to as many digits as you choose to display.