Convert Grains to Troy ounces
1 grain is 0.002083 ozt. One grain is exactly 0.00208333333333 troy ounces.
One grain is 0.0020833333 troy ounces. To convert grains to troy ounces, multiply by 0.0020833333; to go the other way, divide by 0.0020833333 or multiply by 480. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 44. Exactly 64.79891 milligrams, the unit both the avoirdupois and troy systems are built from.
Factor checked against the defining standard · How we check
- Grains × 0.0020833333
1 * 0.00208330.002 ozt
1 grain in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 0.002285714286 oz | × 0.00228571428571 |
| pounds | 0.0001428571429 lb | × 0.000142857142857 |
| stone | 0.00001020408163 st | × 0.0000102040816327 |
| US tons | 0.00000007142857143 ton | × 0.0000000714285714286 |
| micrograms | 64,798.91 mcg | × 64,798.91 |
| milligrams | 64.79891 mg | × 64.79891 |
| centigrams | 6.479891 cg | × 6.479891 |
| grams | 0.06479891 g | × 0.06479891 |
| kilograms | 0.00006479891 kg | × 0.00006479891 |
| slugs | 0.000004440135739 slug | × 0.0000044401357388 |
| tonnes | 0.00000006479891 t | × 0.00000006479891 |
| carats | 0.32399455 ct | × 0.32399455 |
| troy ounces | 0.002083333333 ozt | × 0.00208333333333 |
| grains (as entered) | 1 gr | — |
| long tons | 0.0000000637755102 LT | × 0.0000000637755102041 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert grains to troy ounces? The converter and the working
- 1.Take the measurement in grains.
- 2.Multiply by 0.0020833333 — that is how many troy ounces fit in one grain.
- 3.To go back the other way, divide by 0.0020833333, or multiply by 480.
Worked example: 25 grains to troy ounces
- Formula
- gr × 0.0020833333 = ozt
- Arithmetic
- 25 × 0.0020833333 = 0.05 ozt
- Answer
- 25 gr = 0.05 ozt
The factor is rounded for display; the figure above is computed from the full value.
Grains to troy ounces conversion table
| Grains | Troy ounces |
|---|---|
| 1 gr | 0.002083 ozt |
| 2 gr | 0.004167 ozt |
| 3 gr | 0.01 ozt |
| 4 gr | 0.01 ozt |
| 5 gr | 0.01 ozt |
| 6 gr | 0.01 ozt |
| 7 gr | 0.01 ozt |
| 8 gr | 0.02 ozt |
| 9 gr | 0.02 ozt |
| 10 gr | 0.02 ozt |
| 12 gr | 0.02 ozt |
| 15 gr | 0.03 ozt |
| 20 gr | 0.04 ozt |
| 25 gr | 0.05 ozt |
| 50 gr | 0.1 ozt |
| 100 gr | 0.21 ozt |
| 200 gr | 0.42 ozt |
| 300 gr | 0.62 ozt |
| 500 gr | 1.04 ozt |
| 1000 gr | 2.08 ozt |
| 2000 gr | 4.17 ozt |
| 5000 gr | 10.42 ozt |
| 10000 gr | 20.83 ozt |
What is a grain?
Exactly 64.79891 milligrams, the unit both the avoirdupois and troy systems are built from. Bullet weights and powder charges are still measured in it, and so are some pharmaceutical doses.
What is a troy ounce?
Exactly 31.1034768 grams, and the only ounce bullion is ever quoted in. It is about 10% heavier than the ounce on a kitchen scale, so a "pound" of gold — twelve troy ounces — is lighter than a pound of anything else.
How many troy ounces are in a grain?
One grain is 0.0020833333 troy ounces. Going the other way, one troy ounce is 480 grains. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a grain.
Cite this page
- APA
- Rule Calculator. (2026). Convert Grains to troy ounces. Rule Calculator. https://rulecalculators.com/convert/grain-to-troy-ounce
- MLA
- "Convert Grains to troy ounces." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/grain-to-troy-ounce.
- Chicago
- Rule Calculator. "Convert Grains to troy ounces." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/grain-to-troy-ounce.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many troy ounces are in a grain?
- 0.0020833333. Exactly 31.1034768 grams, and the only ounce bullion is ever quoted in. It is about 10% heavier than the ounce on a kitchen scale, so a "pound" of gold — twelve troy ounces — is lighter than a pound of anything else.
- How do I convert troy ounces back to grains?
- Divide by 0.0020833333, or multiply by 480 — they are the same operation.
Other weight conversions
Troy ounces to grains — the same conversion the other way.