Gold bar weight calculator
One standard 400 troy ounce gold bar is 12,441.4 g, 12.441 kg or 27.43 lb (the U.S. Mint says about 27.5 lb).
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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The calculator needs JavaScript. The tables below give the same numbers for common cases.
| Weight of | Troy ounces | Grams | Kilograms | Pounds |
|---|---|---|---|---|
| One standard bar (about 400 troy oz) | 400 troy oz | 12,441.4 g | 12.441 kg | 27.429 lb |
| Lightest Good Delivery bar | 350 troy oz | 10,886.2 g | 10.886 kg | 24 lb |
| Heaviest Good Delivery bar | 430 troy oz | 13,374.5 g | 13.374 kg | 29.486 lb |
| One troy ounce | 1 troy oz | 31.1035 g | 0.031 kg | 0.069 lb |
Type an amount, choose its unit (standard bars, troy ounces, grams, kilograms, pounds or everyday ounces) and the other units are filled in. One bar here means the standard 400 troy ounce bar the U.S. Mint describes; the real weight of a bar varies within the London Good Delivery range of 350 to 430 fine troy ounces.
The conversions use a troy ounce of 31.1034768 g (the value in the Federal Register notice) and a pound of 453.59237 g. The tool gives weights only: there is no price, value or market data, and kilobars and small bars are not included.
Frequently asked questions
How many troy ounces are in a kilogram?
32.151 (1,000 g divided by 31.1034768 g).
How many kilograms is a 400 troy ounce bar?
About 12.441 kg.
How many pounds is a 400 troy ounce bar?
About 27.43 lb worked out exactly; the U.S. Mint says 27.5 lb.
Does the tool show a price?
No. It converts weights only.
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.