Convert Ounces to Troy ounces
1 ounce is 0.91 ozt. One ounce is exactly 0.911458333333 troy ounces.
One ounce is 0.91145833 troy ounces. To convert ounces to troy ounces, multiply by 0.91145833; to go the other way, divide by 0.91145833 or multiply by 1.0971429. 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. One sixteenth of a pound.
Factor checked against the defining standard · How we check
- Ounces × 0.91145833
1 * 0.91145830.911 ozt
1 ounce in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces (as entered) | 1 oz | — |
| pounds | 0.0625 lb | × 0.0625 |
| stone | 0.004464285714 st | × 0.00446428571429 |
| US tons | 0.00003125 ton | × 0.00003125 |
| micrograms | 28,349,523.13 mcg | × 28,349,523.125 |
| milligrams | 28,349.52313 mg | × 28,349.523125 |
| centigrams | 2,834.952313 cg | × 2,834.9523125 |
| grams | 28.34952313 g | × 28.349523125 |
| kilograms | 0.02834952313 kg | × 0.028349523125 |
| slugs | 0.001942559386 slug | × 0.00194255938572 |
| tonnes | 0.00002834952313 t | × 0.000028349523125 |
| carats | 141.7476156 ct | × 141.747615625 |
| troy ounces | 0.9114583333 ozt | × 0.911458333333 |
| grains | 437.5 gr | × 437.5 |
| long tons | 0.00002790178571 LT | × 0.0000279017857143 |
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 ounces to troy ounces? The converter and the working
- 1.Take the measurement in ounces.
- 2.Multiply by 0.91145833 — that is how many troy ounces fit in one ounce.
- 3.To go back the other way, divide by 0.91145833, or multiply by 1.0971429.
Worked example: 25 ounces to troy ounces
- Formula
- oz × 0.91145833 = ozt
- Arithmetic
- 25 × 0.91145833 = 22.79 ozt
- Answer
- 25 oz = 22.79 ozt
The factor is rounded for display; the figure above is computed from the full value.
Ounces to troy ounces conversion table
| Ounces | Troy ounces |
|---|---|
| 1 oz | 0.91 ozt |
| 2 oz | 1.82 ozt |
| 3 oz | 2.73 ozt |
| 4 oz | 3.65 ozt |
| 5 oz | 4.56 ozt |
| 6 oz | 5.47 ozt |
| 7 oz | 6.38 ozt |
| 8 oz | 7.29 ozt |
| 9 oz | 8.2 ozt |
| 10 oz | 9.11 ozt |
| 12 oz | 10.94 ozt |
| 15 oz | 13.67 ozt |
| 20 oz | 18.23 ozt |
| 25 oz | 22.79 ozt |
| 50 oz | 45.57 ozt |
| 100 oz | 91.15 ozt |
| 200 oz | 182.29 ozt |
| 300 oz | 273.44 ozt |
| 500 oz | 455.73 ozt |
| 1000 oz | 911.46 ozt |
| 2000 oz | 1,822.92 ozt |
| 5000 oz | 4,557.29 ozt |
| 10000 oz | 9,114.58 ozt |
The ounce gold is priced in is 10% heavier than the one on a kitchen scale
A troy ounce is exactly 31.1034768 g; the avoirdupois ounce is 28.349523125 g. Bullion, and only bullion, is quoted per troy ounce, so a spot price of $2,400 an ounce is $2,400 for 31.1 g rather than 28.3. The troy pound compounds the confusion by holding twelve of its ounces instead of sixteen, which makes it lighter than an ordinary pound despite the heavier ounce.
NIST Handbook 44, Appendix C — general tables of units of measurement
What is an ounce?
One sixteenth of a pound. Not to be confused with the fluid ounce, which measures volume.
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 an ounce?
One ounce is 0.91145833 troy ounces. Going the other way, one troy ounce is 1.0971429 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 an ounce.
Cite this page
- APA
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- Chicago
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Questions people actually ask
- How many troy ounces are in an ounce?
- 0.91145833. 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 ounces?
- Divide by 0.91145833, or multiply by 1.0971429 — they are the same operation.
Other weight conversions
Troy ounces to ounces — the same conversion the other way.