Convert Ounce to Troy ounce
1 ounce = 0.9114583 troy ounce (oz t). For example, 10 ounce = 9.114583 troy ounce and 100 ounce = 91.14583 troy ounce. Type any value below to convert ounce to troy ounce both ways — it runs entirely in your browser.
Quick answer: Ounce to Troy ounce
1 Ounce = 0.9114583 Troy ounce (oz → oz t). To convert ounce to troy ounce, multiply by 0.9114583. To convert troy ounce to ounce, multiply by 1.097143. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common ounce-to-troy ounce questions.
How to convert Ounce to Troy ounce
To convert ounce to troy ounce, multiply the number of ounce by the conversion factor 0.9114583, because 1 oz = 0.9114583 oz t. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 oz t = 1.097143 oz, so you divide by 0.9114583 (or multiply by 1.097143) to turn troy ounce back into ounce.
oz t = oz × 0.9114583 ·
oz = oz t × 1.097143
- Write down the value you want to convert, in ounce.
- Multiply it by 0.9114583.
- The result is the same area/length/quantity expressed in troy ounce.
Ounce to Troy ounce — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 ounce is 4.557292 troy ounce because 5 oz × 0.9114583 = 4.557292 oz t.
| Ounce | Calculation | Troy ounce |
|---|---|---|
| 1 oz | 1 oz × 0.9114583 = 0.9114583 oz t | 0.9114583 oz t |
| 2 oz | 2 oz × 0.9114583 = 1.822917 oz t | 1.822917 oz t |
| 3 oz | 3 oz × 0.9114583 = 2.734375 oz t | 2.734375 oz t |
| 5 oz | 5 oz × 0.9114583 = 4.557292 oz t | 4.557292 oz t |
| 7 oz | 7 oz × 0.9114583 = 6.380208 oz t | 6.380208 oz t |
| 10 oz | 10 oz × 0.9114583 = 9.114583 oz t | 9.114583 oz t |
| 12 oz | 12 oz × 0.9114583 = 10.9375 oz t | 10.9375 oz t |
| 15 oz | 15 oz × 0.9114583 = 13.67188 oz t | 13.67188 oz t |
| 20 oz | 20 oz × 0.9114583 = 18.22917 oz t | 18.22917 oz t |
| 25 oz | 25 oz × 0.9114583 = 22.78646 oz t | 22.78646 oz t |
| 50 oz | 50 oz × 0.9114583 = 45.57292 oz t | 45.57292 oz t |
| 100 oz | 100 oz × 0.9114583 = 91.14583 oz t | 91.14583 oz t |
Common Ounce to Troy ounce conversions
These are the ounce-to-troy ounce values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 ounce = 0.9114583 troy ounce
- 2 ounce = 1.822917 troy ounce
- 2.5 ounce = 2.278646 troy ounce
- 3 ounce = 2.734375 troy ounce
- 4 ounce = 3.645833 troy ounce
- 5 ounce = 4.557292 troy ounce
- 6 ounce = 5.46875 troy ounce
- 7 ounce = 6.380208 troy ounce
- 8 ounce = 7.291667 troy ounce
- 9 ounce = 8.203125 troy ounce
- 10 ounce = 9.114583 troy ounce
- 12 ounce = 10.9375 troy ounce
- 15 ounce = 13.67188 troy ounce
- 20 ounce = 18.22917 troy ounce
- 25 ounce = 22.78646 troy ounce
- 30 ounce = 27.34375 troy ounce
- 50 ounce = 45.57292 troy ounce
- 75 ounce = 68.35938 troy ounce
- 100 ounce = 91.14583 troy ounce
- 200 ounce = 182.2917 troy ounce
- 500 ounce = 455.7292 troy ounce
- 1000 ounce = 911.4583 troy ounce
Ounce to Troy ounce conversion chart (both directions)
The chart below converts ounce to troy ounce and troy ounce to ounce side by side, so it works whichever way you need. 1 ounce = 0.9114583 troy ounce, and 1 troy ounce = 1.097143 ounce.
| Ounce → Troy ounce | Troy ounce → Ounce |
|---|---|
| 0.25 oz = 0.2278646 oz t | 0.25 oz t = 0.2742857 oz |
| 0.5 oz = 0.4557292 oz t | 0.5 oz t = 0.5485714 oz |
| 1 oz = 0.9114583 oz t | 1 oz t = 1.097143 oz |
| 2 oz = 1.822917 oz t | 2 oz t = 2.194286 oz |
| 3 oz = 2.734375 oz t | 3 oz t = 3.291429 oz |
| 4 oz = 3.645833 oz t | 4 oz t = 4.388571 oz |
| 5 oz = 4.557292 oz t | 5 oz t = 5.485714 oz |
| 6 oz = 5.46875 oz t | 6 oz t = 6.582857 oz |
| 7 oz = 6.380208 oz t | 7 oz t = 7.68 oz |
| 8 oz = 7.291667 oz t | 8 oz t = 8.777143 oz |
| 9 oz = 8.203125 oz t | 9 oz t = 9.874286 oz |
| 10 oz = 9.114583 oz t | 10 oz t = 10.97143 oz |
| 12 oz = 10.9375 oz t | 12 oz t = 13.16571 oz |
| 15 oz = 13.67188 oz t | 15 oz t = 16.45714 oz |
| 20 oz = 18.22917 oz t | 20 oz t = 21.94286 oz |
| 25 oz = 22.78646 oz t | 25 oz t = 27.42857 oz |
| 30 oz = 27.34375 oz t | 30 oz t = 32.91429 oz |
| 40 oz = 36.45833 oz t | 40 oz t = 43.88571 oz |
| 50 oz = 45.57292 oz t | 50 oz t = 54.85714 oz |
| 75 oz = 68.35938 oz t | 75 oz t = 82.28571 oz |
| 100 oz = 91.14583 oz t | 100 oz t = 109.7143 oz |
| 150 oz = 136.7188 oz t | 150 oz t = 164.5714 oz |
| 200 oz = 182.2917 oz t | 200 oz t = 219.4286 oz |
| 250 oz = 227.8646 oz t | 250 oz t = 274.2857 oz |
| 500 oz = 455.7292 oz t | 500 oz t = 548.5714 oz |
| 1000 oz = 911.4583 oz t | 1000 oz t = 1,097.143 oz |
Ounce vs Troy ounce: which is bigger?
A troy ounce is the larger unit: one troy ounce equals 1.097143 ounces. Put another way, you need 1.097143 ounces to make a single troy ounce.
What is a Ounce? History, origin and usage
The ounce comes from the Latin uncia, meaning a twelfth part — originally a twelfth of the Roman libra. English later reorganised its weights around the avoirdupois system, in which the pound is divided into sixteen ounces rather than twelve, and that sixteenth is the ounce used for ordinary goods today.
Ounces are used for food packaging, recipes, letters and small parcels in the United States, and for some foods and postal rates in the United Kingdom. Recipe writers use them constantly for butter, flour and cheese.
The same Latin root uncia also gave English the word "inch" — a twelfth of a foot. Confusingly, the troy ounce used for gold is a different and heavier ounce, and a "fluid ounce" is a measure of volume, not weight at all.
What is a Troy ounce? History, origin and usage
The troy ounce is named after Troyes, a town in the Champagne region of France whose medieval trade fairs drew merchants from across Europe and whose weight standards travelled home with them. The troy system was kept for precious metals and gemstones when England reorganised everything else around avoirdupois weights, and it has survived in that role ever since.
Gold, silver, platinum and palladium are priced per troy ounce on every major bullion market, so the "gold price" quoted in the news is a price per troy ounce. Jewellers and mints work in it, and coins such as the Krugerrand and the American Eagle are struck to contain exactly one troy ounce of fine metal.
A troy ounce is heavier than the ordinary ounce — 480 grains against 437.5 — so buying "an ounce of gold" gets you about ten per cent more metal than an ounce of anything else. The troy pound is stranger still: it contains twelve troy ounces, not sixteen, and is therefore lighter than the ordinary pound.
Convert 1 Ounce to other units
It can help to see a ounce next to the other units it is commonly compared with. One ounce (oz) is equal to:
| 1 Ounce equals | Unit |
|---|---|
| 0.02834952 kg | Kilogram |
| 28.34952 g | Gram |
| 28,349.52 mg | Milligram |
| 28,349,520 µg | Microgram |
| 0.00002834952 t | Tonne |
| 0.0002834952 q | Quintal |
| 0.0625 lb | Pound |
| 0.004464286 st | Stone |
| 0.00003125 ton (US) | Short ton |
| 0.00002790179 ton (UK) | Long ton |
| 0.9114583 oz t | Troy ounce |
| 437.5 gr | Grain |
| 141.7476 ct | Carat |
Convert 1 Troy ounce to other units
One troy ounce (oz t) is equal to:
| 1 Troy ounce equals | Unit |
|---|---|
| 0.03110348 kg | Kilogram |
| 31.10348 g | Gram |
| 31,103.48 mg | Milligram |
| 31,103,480 µg | Microgram |
| 0.00003110348 t | Tonne |
| 0.0003110348 q | Quintal |
| 0.06857143 lb | Pound |
| 1.097143 oz | Ounce |
| 0.004897959 st | Stone |
| 0.00003428571 ton (US) | Short ton |
| 0.00003061224 ton (UK) | Long ton |
| 480 gr | Grain |
| 155.5174 ct | Carat |
Tips for converting Ounce to Troy ounce
- To go from ounce to troy ounce, multiply by 0.9114583; to go back, divide by 0.9114583 (or multiply by 1.097143).
- For a quick mental estimate, remember that 1 ounce ≈ 0.9114583 troy ounce, so 10 ounce ≈ 9.114583 troy ounce.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Ounce to Troy ounce converter
Type a number into the Ounce field and the equivalent in Troy ounce appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Troy ounce field to convert the other way (troy ounce to ounce). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 oz = 0.9114583 oz t), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for ounce-to-troy ounce conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary weight units. The 1959 international yard-and-pound agreement fixes the international avoirdupois pound at exactly 0.453 592 37 kilogram, and the ounce, stone, grain and both tons are defined as exact fractions or multiples of that pound — so every imperial weight on this page is exact, not rounded.
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
Weight factors here are exact, anchored to the kilogram: the international pound is exactly 0.45359237 kg, a stone is 14 pounds, a short ton is 2,000 pounds and a long ton is 2,240, a grain is 1/7000 of a pound and a metric carat is exactly 200 mg. So the live tool and every number on this page always agree.
Frequently asked questions
- How many troy ounce are in 1 ounce?
- 1 ounce = 0.9114583 troy ounce (oz t). To convert any number of ounce to troy ounce, multiply by 0.9114583.
- How do I convert ounce to troy ounce?
- Multiply the number of ounce by 0.9114583. For example, 10 ounce = 10 × 0.9114583 = 9.114583 troy ounce, and 25 ounce = 22.78646 troy ounce.
- How many ounce are in 1 troy ounce?
- 1 troy ounce = 1.097143 ounce. So to convert troy ounce back to ounce, multiply by 1.097143.
- What is the formula to convert ounce to troy ounce?
- troy ounce = ounce × 0.9114583. The reverse formula is ounce = troy ounce × 1.097143.
- How much is 100 ounce in troy ounce?
- 100 ounce = 91.14583 troy ounce. (And 1000 ounce = 911.4583 troy ounce.)
- Which is bigger, a ounce or a troy ounce?
- A troy ounce is larger: 1 troy ounce = 1.097143 ounce.
- Is this ounce to troy ounce converter accurate?
- Yes — every value is computed from the exact 0.9114583 oz t per oz factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert troy ounce to ounce too?
- Yes. The converter works both ways — enter a value in either field. 1 troy ounce = 1.097143 ounce.