What a Gold Bar Is Worth, From 1 Gram to 400 Ounces

A gold bar is worth its fine gold weight in troy ounces times the spot price, which is today’s spot price per troy ounce today, plus whatever premium the seller adds. Bars run from 1 gram up to the roughly 400 ounce Good Delivery bar of the London market, so before anything else you want two numbers off the bar: its weight and its fineness.

How much is a gold bar worth?

Start with the gold inside it. Weight in troy ounces times fineness gives you the fine gold content, and that times spot gives you the metal value.

Say you're looking at a 1 oz bar stamped 999.9. It holds 0.9999 troy ounces of gold, so its metal value is almost exactly one ounce of spot. A 10 oz bar at the same fineness holds 9.999 troy ounces. A 1 kilo bar holds about 32.15.

That's the melt value. A dealer sells to you at melt plus a premium, and each dealer sets its own price when you sell back. The gold value calculator turns any bar into dollars at the live price, and the premium calculator shows how far an asking price sits above the gold inside.

Gold value calculatorAny weight, any karat, at today's spot price.

Gold bar sizes in grams and troy ounces

Gold is weighed in troy ounces, not the ounces on a kitchen scale. One troy ounce is exactly 31.1034768 grams under the U.S. tables kept by the National Institute of Standards and Technology (NIST). Refiners make bars in metric sizes, in troy ounce sizes, and a few still make them in tolas, a traditional unit.

We've converted each size with the NIST factor. The last column assumes 999.9 fine, the fineness PAMP and Valcambi list for their minted gold bars.

Every size above, bar the Good Delivery one, is in the current range of PAMP or Valcambi, two Swiss refiners on the LBMA list. PAMP's Lady Fortuna minted bars run from 1 gram to 1 kilo, with 1/2 oz, 1 oz, 5 oz and 10 oz sizes among them. Valcambi lists minted gold bars from 1 gram to 1 kilo plus 1 oz and 10 oz, and a 100 oz cast bar made to the COMEX specification.

How many ounces are in a gold bar?

That's down to the bar, which is why the size stamped on it matters.

The big one, the bar traded in London, is the Good Delivery bar. The London Bullion Market Association (LBMA) writes its rules: at least 350 and at most 430 fine troy ounces, at least 995.0 parts per thousand fine, and gross weight recorded in troy ounces in steps of 0.025, rounded down. Even its rough shape is fixed, at about 250 mm long, 70 mm wide across the top and 35 mm high. In practice it's close to 400 troy ounces, or about 12.4 kilograms.

The bars private buyers own are far smaller:

• 1 oz: 31.1034768 grams. PAMP's 1 oz Lady Fortuna bar measures 24 x 41 mm and is 1.73 mm thick.
• 10 oz: 311.03 grams. PAMP's 10 oz Lady Fortuna bar measures 35 x 60 mm and is 7.72 mm thick.
• 1 kilo: 1,000 grams, or 32.1507 troy ounces. PAMP's 1 kilo minted bar measures 52.5 x 118 mm; Valcambi's 1 kilo cast bar measures 53 x 117 mm.
• 100 oz: 3,110 grams. Valcambi lists a 995.0 fine 100 oz bar made to the COMEX standard.

Cast bars and minted bars

The gold's the same. What changes is how the bar is made and how it looks.

A cast bar starts as molten gold poured into a mold of a set size, which is how Valcambi describes its process, and Valcambi says cast bars have traditionally had a less refined finish. Its Good Delivery bars and its 100 oz COMEX bar sit in its cast range. PAMP's cast range runs from 50 grams to 1 kilo, plus a 10 tola bar, a 1 tael bar and a 400 oz bar.

Minted bars, sometimes called wafers, are cut from specially prepared rolled sheets of gold. Valcambi makes them in the same facility as its minted coins. PAMP strikes its Lady Fortuna bars with what it calls a proof-like finish, from 1 gram up to 1 kilo.

The assay card, a bar's certificate

It's the sealed package a small bar comes in, and it doubles as the bar's certificate. The card states weight and fineness and carries the serial number, so whoever buys the bar next can match the two.

PAMP says it first developed its CertiPAMP card in the 1990s. Each one shows the serial number, a QR code and the signature of an independent Swiss Federal Assayer. Bars with the VERISCAN logo can be checked with PAMP's free iPhone app, which reads the bar's microscopic surface pattern and matches it against the record taken at production.

Valcambi seals its minted bars in PETG blisters or capsules, depending on weight and form, each with a certificate showing the serial number. Valcambi also makes the CombiBar, a minted 999.9 bar made of small pieces you can snap apart. The gold versions come as 100 x 1 g, 50 x 1 g, 20 x 1 g and 10 x 1/10 oz, and Valcambi certifies every piece.

Good Delivery bars don't get a card at all. The LBMA requires each one to be marked with a serial number, the refiner's assay stamp, the fineness to four significant figures and the year it was made.

The refiners behind the bars

The LBMA keeps the Good Delivery List. In the LBMA's words, it names only refiners whose bars it has accredited as meeting its standards for the global over the counter market, and exchanges including ICE and CME Group use the LBMA lists. As of October 2026 the current gold list names 67 refiners. A few of them:

The list changes. Refiners get added, suspended or moved to the LBMA's former list, so check the live list before you rely on a name. Small bars aren't traded as Good Delivery bars, but one from a listed refiner comes from a business that has met the LBMA's standard for its large bars. For one refiner in depth, read our PAMP Suisse gold bars guide.

How to choose a gold bar

We'd run four checks before paying for any bar:

1. Is the refiner on the LBMA Good Delivery List?
2. Are the weight and fineness stamped on the bar and printed on the card? Work out the fine gold content before you compare prices.
3. Is it in a sealed assay card with a serial number that matches the bar?
4. What's the price per ounce of gold? Divide the asking price by the fine troy ounces in the bar and set it against today’s spot price. The gap is the premium.

Size is your call. Smaller bars cost less each and are easier to sell one at a time; bigger bars put more gold in one piece. For the buying itself, see how to buy gold and our guide to gold dealers. Want bars held in a retirement account? That's the gold IRA guide. And before a bar goes in the drawer, read how to spot fake gold and gold storage.

More on gold bar sizes and prices

How much is a gold bar worth?

Its fine gold content in troy ounces times the spot price, which is today’s spot price per troy ounce today. A 1 oz bar at 999.9 fine holds 0.9999 troy ounces. Dealers sell above that and set their own buy prices, so what you pay or receive won't match melt value exactly.

How many ounces are in a gold bar?

A London Good Delivery bar holds between 350 and 430 fine troy ounces, usually close to 400. Retail bars go from 1 gram (0.0322 troy ounces) to 1 kilo (32.1507 troy ounces), with 1 oz, 10 oz and 100 oz bars in between.

How much does a 1 oz gold bar weigh in grams?

31.1034768 grams. That's a troy ounce, the unit gold is weighed in, and it's heavier than the 28.35 gram ounce on a kitchen scale.

What is a 10 oz gold bar worth?

At 999.9 fine it holds 9.999 troy ounces of gold, so its metal value is 9.999 times today’s spot price. The gold value calculator gives you the dollar figure.

How much gold is in a 1 kilo gold bar?

A kilogram is 32.1507 troy ounces. At 999.9 fine, a 1 kilo bar holds about 32.15 troy ounces of gold.

What are the best gold bars to buy?

We'd buy bars from a refiner on the LBMA Good Delivery List, sealed in an assay card with a matching serial number, in a size that fits what you plan to spend. Compare offers on price per fine ounce, never price per bar.

Sources and fact-check12 primary sources, checked October 17, 2026

1. NIST: Handbook 44 (2024), Appendix C, General Tables of Units of Measurement
2. NIST Office of Weights and Measures: Conversion Factors for Precious Metal Sales
3. LBMA: The OTC Guide, London Good Delivery gold and silver
4. LBMA: Good Delivery Current List, Gold
5. PAMP: Lady Fortuna
6. PAMP: Lady Fortuna Gold Minted Bar, 10 oz
7. PAMP: Lady Fortuna Gold Minted Bar, 1 kg
8. PAMP: Cast bars
9. PAMP: VERISCAN guide and FAQ
10. Valcambi: Minted bars
11. Valcambi: Cast bars
12. Valcambi: CombiBar

We check every figure against the original source: the mint, the regulator, the exchange or the company itself. Spotted something out of date? Tell us.