Guide · 2 min read

Troy ounces and grams: how gold is weighed and priced

Short answer: Gold is priced per troy ounce, which is 31.1034768 grams. XAUUSD is the dollar price of one troy ounce. To get a price per gram, divide by 31.1034768; for a kilo, multiply the ounce price by about 32.15. At many MT5 brokers one lot is 100 troy ounces, but check your symbol's contract size.

Published: 24 October 2026.

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The troy ounce is older than most of the markets that use it. It survives because gold, silver and platinum have always been weighed with it.

The numbers

1 troy ounce = 31.1034768 grams.
1 kilogram = about 32.15 troy ounces.
1 everyday ounce = 28.35 grams, about 10% lighter than a troy ounce.
1 tola = about 11.66 grams.

Converting the price

Per gram: price per ounce ÷ 31.1034768.
Per kilo: price per ounce × 32.1507.
For carats: multiply by the gold content: 22 carat is 22/24, about 91.7%; 18 carat is 75%.

What a lot holds

At many brokers one standard XAUUSD lot is 100 troy ounces, so a 1 dollar move is worth 100 dollars per lot. Some brokers use other sizes, so check the contract size in MT5 (right-click the symbol, Specification). See what a pip is worth on gold and how to calculate lot size for gold.

Gold futures use the same unit: the standard contract is 100 troy ounces. See XAUUSD vs gold futures and our contract calculator.

Before you size a trade

Put the contract size, your balance, your risk and your stop into the position size calculator. A wrong contract size is one of the most common reasons a loss turns out ten times bigger than planned.

The Monthly Pass and the Lifetime Pass are software licences for your own MetaTrader account. They score every robot and strategy you run the same way, with costs inside every number. See the plans.

FAQ

How many grams are in a troy ounce?

31.1034768 grams. A troy ounce is about 10% heavier than the everyday (avoirdupois) ounce of 28.35 grams.

Is the XAUUSD price per troy ounce?

Yes. XAUUSD quotes the price of one troy ounce of gold in US dollars.

How do I convert the gold price to a price per gram?

Divide the price per troy ounce by 31.1034768. For a kilo, multiply the price per gram by 1,000, or the ounce price by about 32.15.

How many ounces are in one lot of XAUUSD?

At many MT5 brokers one standard lot is 100 troy ounces, but some use other sizes. Check the contract size in the symbol's specification before you size a trade.

Why do jewellers' prices differ from XAUUSD?

XAUUSD is the price of pure gold in the wholesale market. Jewellery adds making costs, margins and taxes, and is often less than pure gold, such as 18 or 22 carat.

What is a tola or a tael?

Traditional gold weights used in South Asia and East Asia. A tola is about 11.66 grams; a tael is about 37.4 to 37.8 grams, depending on the region.

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An educational tool. It is not investment advice. Trading leveraged products such as gold CFDs carries a high risk of losing money, and you can lose all of it.

BaroqTech makes software. It is not investment advice and it does not manage money. Trading leveraged products such as gold CFDs carries a high risk of losing money, and you can lose all of it. Results from a test or from a demo account do not predict results on a real account.

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Troy ounces and grams: how gold is weighed and priced

The numbers

Converting the price

What a lot holds

Before you size a trade

FAQ

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Keep reading

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