A grain is exactly 64.79891 milligrams.
Grains to Troy ounces Converter — gr to oz t
Convert Grain (gr) to Troy ounce (oz t) using the exact conversion factor (1 grain = 0.0020833333 troy ounce). See the formula, worked examples, and conversion table.
Grains to Troy ounces 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 troy ounce is exactly 31.1034768 grams.
Result = input x 6.479891e-5 / 0.0311034768.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains to Troy ounces
Weight conversions between Grain and Troy ounce 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 grain is exactly 64.79891 milligrams, and a troy ounce is exactly 31.1034768 grams.
Formula
troy ounces = grains × 0.00208333333333
This factor comes from each unit's defined relationship to the category's base unit: 1 grain equals 0.00006479891 base units, and 1 troy ounce equals 0.0311034768 base units, so dividing one by the other gives the direct grain-to-troy ounce factor of 0.00208333333333.
Simple example
1 gr × 0.002083333333 = 0.0020833333 oz t
1 grain = 0.0020833333 troy ounces.
Real-world example
50 gr × 0.002083333333 = 0.1041666667 oz t
50 grains = 0.1041666667 troy ounces.
Conversion table
| Grain (gr) | Troy ounce (oz t) |
|---|---|
| 1 gr | 0.0020833333 oz t |
| 5 gr | 0.0104166667 oz t |
| 10 gr | 0.0208333333 oz t |
| 25 gr | 0.0520833333 oz t |
| 50 gr | 0.1041666667 oz t |
| 100 gr | 0.2083333333 oz t |
Reverse conversion: Troy ounce to Grain
0.0020833333 oz t × 480 = 0.999999984 gr
0.0020833333 troy ounces = 0.999999984 grains.
grains = troy ounces × 480
For a page dedicated to this direction, see Troy ounce to Grain.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many troy ounces are in 1 grain?
1 grain equals 0.0020833333 troy ounces, using the exact defined conversion factor rather than an estimate.
How do I convert grain to troy ounce?
Multiply the grain value by 0.002083333333. The converter above does this instantly to whatever precision you set.
How do I convert troy ounce back to grain?
Use the reverse factor: 1 troy ounce equals 480 grains. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain?
Grain (gr) is a unit of mass/weight.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
Is the grain to troy ounce conversion exact?
Yes. Both grain and troy ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.002083333333 used above is exact to as many digits as you choose to display.