How much does a gold bar weigh?
A standard gold bar weighs about 400 troy ounces, which the U.S. Mint gives as 27.5 pounds. In metric that is about 12.44 kg.
These are troy ounces, not everyday ounces: a troy ounce is 31.1034768 g, an everyday (avoirdupois) ounce is 28.349523125 g. No gold price or value is shown on this site.
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| Fact | Value |
|---|---|
| Nominal weight (U.S. Mint) | about 400 troy ounces, or 27.5 pounds |
| Same weight in grams | 12,441 g (12.441 kg, 27.43 lb) |
| Size (U.S. Mint) | 7 × 3 5/8 × 1 3/4 in (177.8 × 92.1 × 44.5 mm) |
| London Good Delivery range | 350 to 430 fine troy ounces, fineness at least 995 per 1,000 |
| Lightest Good Delivery bar | 10,886 g (10.886 kg, 24 lb) |
| Heaviest Good Delivery bar | 13,374 g (13.374 kg, 29.49 lb) |
| Unit | Amount |
|---|---|
| Troy ounces | 400 |
| Grams | 12,441.4 |
| Kilograms | 12.441 |
| Pounds (everyday) | 27.43 |
| Everyday (avoirdupois) ounces | 438.9 |
The U.S. Mint says a standard gold bar is approximately 400 ounces or 27.5 pounds and measures 7 × 3 5/8 × 1 3/4 in (177.8 × 92.1 × 44.5 mm). Those 400 ounces are troy ounces (31.1034768 g each), which is why the pound figure is about 27.43 lb when worked out exactly; the Mint rounds it to 27.5.
The bar is not exactly 400 ounces. A London Good Delivery bar, commonly called a 400 ounce bar, has to contain between 350 and 430 fine troy ounces of gold with a fineness of at least 995 parts per 1,000 (Federal Register notice describing the LBMA standard), so one bar can weigh anywhere from about 10.9 kg to 13.4 kg of fine gold. This page covers that large bar only, and gives no price.
Frequently asked questions
How much does a standard gold bar weigh?
About 400 troy ounces, or 27.5 pounds according to the U.S. Mint (about 12.44 kg).
How many grams are in a 400 troy ounce bar?
400 × 31.1034768 g = 12,441.4 g.
How big is a standard gold bar?
7 × 3 5/8 × 1 3/4 in (177.8 × 92.1 × 44.5 mm), according to the U.S. Mint.
Can a 400 ounce bar weigh more or less than 400 ounces?
Yes. A London Good Delivery bar has between 350 and 430 fine troy ounces of gold.
Is a troy ounce the same as an ordinary ounce?
No. A troy ounce is 31.1034768 g; an ordinary (avoirdupois) ounce is 28.349523125 g.
Sources: U.S. Mint, Fort Knox Bullion Depository (standard gold bar size and weight); Federal Register, 2021-04-30 (London Good Delivery bar: 350 to 430 fine troy ounces). Checked 2026-11-12. Figures described as "about" or "roughly" are arithmetic on these sources.
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General information only. Weights, sizes and counts come from the sources shown on each page and may change; check with your bank or the issuer before you rely on them. Nothing here is financial advice.