Convert Troy ounces to Grains
1 troy ounce is 480 gr. One troy ounce is exactly 480 grains.
One troy ounce is 480 grains. To convert troy ounces to grains, multiply by 480; to go the other way, divide by 480 or multiply by 0.0020833333. The factor is exact rather than rounded: it follows from NIST Handbook 44. Exactly 31.1034768 grams, and the only ounce bullion is ever quoted in.
Factor checked against the defining standard · How we check
- Troy ounces × 480
1 * 480480 gr
1 troy ounce in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 1.097142857 oz | × 1.09714285714 |
| pounds | 0.06857142857 lb | × 0.0685714285714 |
| stone | 0.004897959184 st | × 0.00489795918367 |
| US tons | 0.00003428571429 ton | × 0.0000342857142857 |
| micrograms | 31,103,476.8 mcg | × 31,103,476.8 |
| milligrams | 31,103.4768 mg | × 31,103.4768 |
| centigrams | 3,110.34768 cg | × 3,110.34768 |
| grams | 31.1034768 g | × 31.1034768 |
| kilograms | 0.0311034768 kg | × 0.0311034768 |
| slugs | 0.002131265155 slug | × 0.00213126515462 |
| tonnes | 0.0000311034768 t | × 0.0000311034768 |
| carats | 155.517384 ct | × 155.517384 |
| troy ounces (as entered) | 1 ozt | — |
| grains | 480 gr | × 480 |
| long tons | 0.0000306122449 LT | × 0.000030612244898 |
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 troy ounces to grains? The converter and the working
- 1.Take the measurement in troy ounces.
- 2.Multiply by 480 — that is how many grains fit in one troy ounce.
- 3.To go back the other way, divide by 480, or multiply by 0.0020833333.
Worked example: 25 troy ounces to grains
- Formula
- ozt × 480 = gr
- Arithmetic
- 25 × 480 = 12,000 gr
- Answer
- 25 ozt = 12,000 gr
The factor is exact, so this figure is exact too — only the display is rounded.
Troy ounces to grains conversion table
| Troy ounces | Grains |
|---|---|
| 1 ozt | 480 gr |
| 2 ozt | 960 gr |
| 3 ozt | 1,440 gr |
| 4 ozt | 1,920 gr |
| 5 ozt | 2,400 gr |
| 6 ozt | 2,880 gr |
| 7 ozt | 3,360 gr |
| 8 ozt | 3,840 gr |
| 9 ozt | 4,320 gr |
| 10 ozt | 4,800 gr |
| 12 ozt | 5,760 gr |
| 15 ozt | 7,200 gr |
| 20 ozt | 9,600 gr |
| 25 ozt | 12,000 gr |
| 50 ozt | 24,000 gr |
| 100 ozt | 48,000 gr |
| 200 ozt | 96,000 gr |
| 300 ozt | 144,000 gr |
| 500 ozt | 240,000 gr |
| 1000 ozt | 480,000 gr |
| 2000 ozt | 960,000 gr |
| 5000 ozt | 2,400,000 gr |
| 10000 ozt | 4,800,000 gr |
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.
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.
How many grains are in a troy ounce?
One troy ounce is 480 grains, exactly. Going the other way, one grain is 0.0020833333 troy ounces. 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 troy ounce.
Cite this page
- APA
- Rule Calculator. (2026). Convert Troy ounces to grains. Rule Calculator. https://rulecalculators.com/convert/troy-ounce-to-grain
- MLA
- "Convert Troy ounces to grains." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/troy-ounce-to-grain.
- Chicago
- Rule Calculator. "Convert Troy ounces to grains." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/troy-ounce-to-grain.
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 grains are in a troy ounce?
- 480. 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.
- How do I convert grains back to troy ounces?
- Divide by 480, or multiply by 0.0020833333 — they are the same operation.
Other weight conversions
Grains to troy ounces — the same conversion the other way.