The Coin Cellar · Debasement Basement Tools
Troy ounce converter: grams, kilos, pounds, pennyweight and tola
One troy ounce is 31.1035 grams, about 10% heavier than the ordinary ounce of 28.35 grams. A kilogram is 32.15 troy ounces, an ordinary pound is 14.58 troy ounces, and a 100-ounce silver bar weighs 6.86 pounds. Type any weight below, in any unit, to see it in all the others and what the pure gold or silver is worth at spot, in your own currency.
Troy ounce and precious metal weight converter
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The value is for pure metal. For a coin or piece that isn’t pure, enter the gold or silver it contains, or use the scrap gold calculator. Nothing you type is sent anywhere.
Weight converter
1 troy ounce of gold is 31.1035 grams.
Put it on one side of a scale and it balances against about 31 dollar bills, since each weighs about a gram. The gold is worth about 129 times that pile, which is why nobody pays for gold with a wheelbarrow of ones.
How this is worked out
- 1. Every unit is defined in grains, and a grain is exactly 0.06479891 grams. A troy ounce is 480 grains (31.1034768 g), a pennyweight 24 grains (1.55517384 g), a tola 180 grains (11.6638038 g), and a troy pound 12 troy ounces (373.2417216 g).
- 2. The ordinary (avoirdupois) ounce is exactly 28.349523125 grams and the pound exactly 453.59237 grams. None of these factors ever changes.
- 3. Value = troy ounces × the spot price per troy ounce, for pure metal. Spot is the indicative price from gold-api.com, refreshed about every 20 minutes, with a stored fallback of $3,996.90 for gold and $54.05 for silver (Oct 24, 2026). A dealer charges more than spot and pays less.
Sources: Troy weight, grain and tola (Wikipedia); standard bar sizes, the London Bullion Market Association; a US banknote’s weight of about one gram, the Bureau of Engraving and Printing. Every calculation runs in your browser. Data updated October 2026.
Troy ounce conversion chart
| Unit | Grams | Troy ounces |
|---|---|---|
| Troy ounce | 31.1035 | 1 |
| Gram | 1 | 0.03215 |
| Kilogram | 1,000 | 32.1507 |
| Ordinary ouncefood, mail, kitchen scales | 28.3495 | 0.9115 |
| Pound16 ordinary ounces | 453.5924 | 14.5833 |
| Troy pound12 troy ounces | 373.2417 | 12 |
| Pennyweight (dwt)US jewelers and scrap buyers | 1.5552 | 0.05 |
| TolaSouth Asia and the Gulf | 11.6638 | 0.375 |
| Grain | 0.0648 | 0.00208 |
How much do gold and silver bars weigh?
| Size | Grams | Pounds | Worth at spot |
|---|---|---|---|
| 1 oz gold coin or bargold content | 31.10 | 0.0686 | $3,996.90 |
| 10 tola gold bar3.75 troy oz | 116.64 | 0.257 | $14,988.38 |
| 1 kilo gold bar32.15 troy oz | 1,000 | 2.205 | $128,503.32 |
| 100 oz silver bar | 3,110.35 | 6.857 | $5,405.00 |
| Standard gold barabout 400 troy oz | 12,441.39 | 27.43 | $1,598,760.00 |
| Standard silver barabout 1,000 troy oz | 31,103.48 | 68.57 | $54,050.00 |
Values are for pure metal at spot and follow the live price. “Standard” bars are the London Good Delivery sizes the big vaults and central banks hold; each is cast close to, not exactly at, 400 or 1,000 ounces.
The famous gold bar from the films, the one stacked in vaults, is a London Good Delivery bar of about 400 troy ounces. That is roughly 27.4 pounds, or 12.4 kilos: liftable, in the way a bag of dog food is liftable, and worth more than most houses. The standard silver bar is about 1,000 ounces and weighs about 68.6 pounds, which is a two-person job worth far less. Coins and the bars most people buy run from a gram to a kilo. The guide to gold bar sizes covers cast and minted bars, assay cards and why no two vault bars weigh the same.
What is a tola?
A tola is the traditional gold weight of South Asia: 180 grains, or 11.6638 grams, which is exactly three eighths of a troy ounce. It became the base unit of weight in British India in 1833, and the 10-tola bar, 116.64 grams, is still a standard size in India, Pakistan, Bangladesh, Nepal, Singapore, the UAE and the other Gulf markets. If a gold price is quoted per tola, divide it by 0.375 to get the price per troy ounce.
What is a pennyweight?
A pennyweight, written dwt, is 24 grains or 1.5552 grams, and 20 of them make a troy ounce. American jewelers and scrap gold buyers still price by it, so an offer “per pennyweight” is about half again what the same offer per gram would look like. To compare, divide a per-pennyweight price by 1.5552 to get the price per gram. The scrap gold calculator takes weights in grams, pennyweight or troy ounces.
Why does a 1-ounce coin weigh more on my kitchen scale?
Because the kitchen scale counts in ordinary ounces, and a troy ounce is 1.097 of them. A 1-ounce silver coin should read about 1.10 oz on a kitchen scale, or 31.1 g with the scale set to grams. The guide to the troy ounce explains why precious metals use their own ounce, and Is My Coin Fake? checks a coin’s weight against the mint’s figure.
Outside the US
The troy ounce is the world’s price unit for gold and silver, so a Maple Leaf in Canada, a Britannia in the UK and a Kangaroo in Australia are all one troy ounce. Day to day, though, most of the world weighs precious metal in grams: jewelers in Europe, Australia, Japan and South Africa quote per gram, and India and the Gulf use grams and tola. This converter shows the value in your own currency; change it in the box under the inputs.
Questions people actually ask
How many grams are in a troy ounce?
Exactly 31.1034768 grams, usually rounded to 31.1035 or 31.1. A troy ounce is 480 grains, and a grain is defined as exactly 0.06479891 grams.
Is a troy ounce heavier than a regular ounce?
Yes. A troy ounce is 31.1035 grams and an ordinary (avoirdupois) ounce is 28.3495 grams, so the troy ounce is about 9.7% heavier. But a troy pound, 12 troy ounces, is lighter than an ordinary pound of 16 ounces.
How many troy ounces are in a kilo?
32.1507 troy ounces. A 1-kilo silver or gold bar therefore holds a little over 32 ounces, and weighs 2.205 ordinary pounds.
How much does a 100 oz silver bar weigh in pounds?
About 6.86 pounds, or 3,110 grams. A 100-troy-ounce bar is 100 × 31.1035 grams, and a pound is 453.59 grams.
How many troy ounces are in a pound?
14.5833 troy ounces in an ordinary pound, not 16. A troy pound, which is rarely used now, is 12 troy ounces.
How much does a gold bar weigh?
It depends on the bar. The standard bar held by central banks and big vaults is about 400 troy ounces, roughly 27.4 pounds or 12.4 kilos. Bars sold to individuals run from 1 gram to 1 kilo, which is 2.2 pounds.
How many grams is a tola of gold?
11.6638 grams, which is 180 grains or exactly 3/8 of a troy ounce. A 10-tola bar is 116.64 grams, or 3.75 troy ounces.
What is a pennyweight in grams?
1.5552 grams. A pennyweight (dwt) is 24 grains, and 20 pennyweight make one troy ounce. US jewelers and scrap buyers often quote gold prices per pennyweight.
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