Convert Troy ounce to Gram
1 troy ounce = 31.10348 gram (g). For example, 10 troy ounce = 311.0348 gram and 100 troy ounce = 3,110.348 gram. Type any value below to convert troy ounce to gram both ways — it runs entirely in your browser.
Quick answer: Troy ounce to Gram
1 Troy ounce = 31.10348 Gram (oz t → g). To convert troy ounce to gram, multiply by 31.10348. To convert gram to troy ounce, multiply by 0.03215075. 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 troy ounce-to-gram questions.
How to convert Troy ounce to Gram
To convert troy ounce to gram, multiply the number of troy ounce by the conversion factor 31.10348, because 1 oz t = 31.10348 g. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 g = 0.03215075 oz t, so you divide by 31.10348 (or multiply by 0.03215075) to turn gram back into troy ounce.
g = oz t × 31.10348 ·
oz t = g × 0.03215075
- Write down the value you want to convert, in troy ounce.
- Multiply it by 31.10348.
- The result is the same area/length/quantity expressed in gram.
Troy ounce to Gram — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 troy ounce is 155.5174 gram because 5 oz t × 31.10348 = 155.5174 g.
| Troy ounce | Calculation | Gram |
|---|---|---|
| 1 oz t | 1 oz t × 31.10348 = 31.10348 g | 31.10348 g |
| 2 oz t | 2 oz t × 31.10348 = 62.20695 g | 62.20695 g |
| 3 oz t | 3 oz t × 31.10348 = 93.31043 g | 93.31043 g |
| 5 oz t | 5 oz t × 31.10348 = 155.5174 g | 155.5174 g |
| 7 oz t | 7 oz t × 31.10348 = 217.7243 g | 217.7243 g |
| 10 oz t | 10 oz t × 31.10348 = 311.0348 g | 311.0348 g |
| 12 oz t | 12 oz t × 31.10348 = 373.2417 g | 373.2417 g |
| 15 oz t | 15 oz t × 31.10348 = 466.5522 g | 466.5522 g |
| 20 oz t | 20 oz t × 31.10348 = 622.0695 g | 622.0695 g |
| 25 oz t | 25 oz t × 31.10348 = 777.5869 g | 777.5869 g |
| 50 oz t | 50 oz t × 31.10348 = 1,555.174 g | 1,555.174 g |
| 100 oz t | 100 oz t × 31.10348 = 3,110.348 g | 3,110.348 g |
Common Troy ounce to Gram conversions
These are the troy ounce-to-gram values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 troy ounce = 31.10348 gram
- 2 troy ounce = 62.20695 gram
- 2.5 troy ounce = 77.75869 gram
- 3 troy ounce = 93.31043 gram
- 4 troy ounce = 124.4139 gram
- 5 troy ounce = 155.5174 gram
- 6 troy ounce = 186.6209 gram
- 7 troy ounce = 217.7243 gram
- 8 troy ounce = 248.8278 gram
- 9 troy ounce = 279.9313 gram
- 10 troy ounce = 311.0348 gram
- 12 troy ounce = 373.2417 gram
- 15 troy ounce = 466.5522 gram
- 20 troy ounce = 622.0695 gram
- 25 troy ounce = 777.5869 gram
- 30 troy ounce = 933.1043 gram
- 50 troy ounce = 1,555.174 gram
- 75 troy ounce = 2,332.761 gram
- 100 troy ounce = 3,110.348 gram
- 200 troy ounce = 6,220.695 gram
- 500 troy ounce = 15,551.74 gram
- 1000 troy ounce = 31,103.48 gram
Troy ounce to Gram conversion chart (both directions)
The chart below converts troy ounce to gram and gram to troy ounce side by side, so it works whichever way you need. 1 troy ounce = 31.10348 gram, and 1 gram = 0.03215075 troy ounce.
| Troy ounce → Gram | Gram → Troy ounce |
|---|---|
| 0.25 oz t = 7.775869 g | 0.25 g = 0.008037687 oz t |
| 0.5 oz t = 15.55174 g | 0.5 g = 0.01607537 oz t |
| 1 oz t = 31.10348 g | 1 g = 0.03215075 oz t |
| 2 oz t = 62.20695 g | 2 g = 0.06430149 oz t |
| 3 oz t = 93.31043 g | 3 g = 0.09645224 oz t |
| 4 oz t = 124.4139 g | 4 g = 0.128603 oz t |
| 5 oz t = 155.5174 g | 5 g = 0.1607537 oz t |
| 6 oz t = 186.6209 g | 6 g = 0.1929045 oz t |
| 7 oz t = 217.7243 g | 7 g = 0.2250552 oz t |
| 8 oz t = 248.8278 g | 8 g = 0.257206 oz t |
| 9 oz t = 279.9313 g | 9 g = 0.2893567 oz t |
| 10 oz t = 311.0348 g | 10 g = 0.3215075 oz t |
| 12 oz t = 373.2417 g | 12 g = 0.385809 oz t |
| 15 oz t = 466.5522 g | 15 g = 0.4822612 oz t |
| 20 oz t = 622.0695 g | 20 g = 0.6430149 oz t |
| 25 oz t = 777.5869 g | 25 g = 0.8037687 oz t |
| 30 oz t = 933.1043 g | 30 g = 0.9645224 oz t |
| 40 oz t = 1,244.139 g | 40 g = 1.28603 oz t |
| 50 oz t = 1,555.174 g | 50 g = 1.607537 oz t |
| 75 oz t = 2,332.761 g | 75 g = 2.411306 oz t |
| 100 oz t = 3,110.348 g | 100 g = 3.215075 oz t |
| 150 oz t = 4,665.522 g | 150 g = 4.822612 oz t |
| 200 oz t = 6,220.695 g | 200 g = 6.430149 oz t |
| 250 oz t = 7,775.869 g | 250 g = 8.037687 oz t |
| 500 oz t = 15,551.74 g | 500 g = 16.07537 oz t |
| 1000 oz t = 31,103.48 g | 1000 g = 32.15075 oz t |
Troy ounce vs Gram: which is bigger?
A troy ounce is the larger unit: one troy ounce equals 31.10348 grams. Put another way, you need 31.10348 grams to make a single troy ounce.
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.
What is a Gram? History, origin and usage
The gram was defined in 1795 as the mass of one cubic centimetre of water at the melting point of ice. It was meant to be the everyday unit, with the kilogram as a bulk multiple — but the kilogram turned out to be the more practical size for a physical standard, so the two swapped roles and the gram became the derived one.
Grams are the normal unit for food, recipes, spices, postage, jewellery and laboratory work — anything too small to weigh comfortably in kilograms. Nutrition labels almost everywhere give protein, fat and sugar in grams.
The gram was the base unit of the old CGS (centimetre-gram-second) system used in physics before SI took over. A gram is roughly the mass of a paperclip, or of one millilitre of water.
Convert 1 Troy ounce to other units
It can help to see a troy ounce next to the other units it is commonly compared with. 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 |
Convert 1 Gram to other units
One gram (g) is equal to:
| 1 Gram equals | Unit |
|---|---|
| 0.001 kg | Kilogram |
| 1,000 mg | Milligram |
| 1,000,000 µg | Microgram |
| 0.000001 t | Tonne |
| 0.00001 q | Quintal |
| 0.002204623 lb | Pound |
| 0.03527396 oz | Ounce |
| 0.000157473 st | Stone |
| 0.000001102311 ton (US) | Short ton |
| 0.0000009842065 ton (UK) | Long ton |
| 0.03215075 oz t | Troy ounce |
| 15.43236 gr | Grain |
| 5 ct | Carat |
Tips for converting Troy ounce to Gram
- To go from troy ounce to gram, multiply by 31.10348; to go back, divide by 31.10348 (or multiply by 0.03215075).
- For a quick mental estimate, remember that 1 troy ounce ≈ 31.10348 gram, so 10 troy ounce ≈ 311.0348 gram.
- 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 Troy ounce to Gram converter
Type a number into the Troy ounce field and the equivalent in Gram 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 Gram field to convert the other way (gram to troy 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 t = 31.10348 g), 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 troy ounce-to-gram 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 gram are in 1 troy ounce?
- 1 troy ounce = 31.10348 gram (g). To convert any number of troy ounce to gram, multiply by 31.10348.
- How do I convert troy ounce to gram?
- Multiply the number of troy ounce by 31.10348. For example, 10 troy ounce = 10 × 31.10348 = 311.0348 gram, and 25 troy ounce = 777.5869 gram.
- How many troy ounce are in 1 gram?
- 1 gram = 0.03215075 troy ounce. So to convert gram back to troy ounce, multiply by 0.03215075.
- What is the formula to convert troy ounce to gram?
- gram = troy ounce × 31.10348. The reverse formula is troy ounce = gram × 0.03215075.
- How much is 100 troy ounce in gram?
- 100 troy ounce = 3,110.348 gram. (And 1000 troy ounce = 31,103.48 gram.)
- Which is bigger, a troy ounce or a gram?
- A troy ounce is larger: 1 troy ounce = 31.10348 gram.
- Is this troy ounce to gram converter accurate?
- Yes — every value is computed from the exact 31.10348 g per oz t factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert gram to troy ounce too?
- Yes. The converter works both ways — enter a value in either field. 1 gram = 0.03215075 troy ounce.