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1 oz Gold Bars
Number of products: 24One troy ounce is 31.1035 g — the unit gold is quoted in worldwide, which makes this the most directly comparable bar in the range. Argor-Heraeus presses it at 40.4 × 23.3 × 1.9 mm, Perth Mint at 41.60 × 24.60 × 2.80 mm, the Royal Mint's Britannia bar at 50.14 × 29.16 mm.
It is one of the two most heavily stocked weights we carry, and the only weight in the range that also exists as a cast bar: the Perth Mint pours a one-ounce bar measuring no more than 19 × 19 × 5 mm.
How big a 1 oz gold bar actually is
Five producers publish specifications for this weight, and the spread between them is larger than at any other point in the range — from a 19 mm square block to a 50 mm card.
| Refiner or standard | Dimensions | Form | Packaging |
|---|---|---|---|
| Argor-Heraeus | 40.4 × 23.3 × 1.9 mm | minted | blister 85 × 55 mm + assay card |
| Perth Mint (Kangaroo) | 41.60 × 24.60 × 2.80 mm max. | minted | tamper-evident blister, shows VOID if lifted |
| Perth Mint (cast bar) | 19 × 19 × 5 mm max. | cast | loose, serial number struck on the bar |
| Royal Mint | 50.14 × 29.16 mm | minted | blister with unique serial number |
| Umicore | 42 × 24 × approx. 1.7 mm | minted | sealed blister |
| Metalor | 24 × 41 mm | minted | blister, six-digit serial, DataMatrix code |
The Perth Mint cast bar is the outlier of the whole range: the same ounce of gold, folded into a block barely wider than a postage stamp. It is the clearest demonstration of what casting does to a bar's proportions.
The ounce as a unit
Gold is quoted per troy ounce on every major market, so an ounce bar removes a conversion step at both ends of the transaction. Whatever the spot figure reads, that is the metal value of the bar before premium — no arithmetic required.
That convenience is why the ounce is usually the best-supplied weight in any dealer's range, and why the premium on it tends to be competitive against neighbouring metric weights such as the 20 g bar.
Refiners in this weight
Valcambi, PAMP, Argor-Heraeus, C.Hafner, Umicore, Metalor, Perth Mint, the Royal Mint, Rand Refinery and Istanbul Gold Refinery, together with the Argor-Heraeus Kinebar. Valcambi, PAMP, Argor-Heraeus, C.Hafner, Umicore, Metalor, the Perth Mint, Rand Refinery and Istanbul Gold Refinery all appear on the LBMA Good Delivery list for gold. The Royal Mint does not — it is a mint rather than an accredited refinery. The accreditation covers the refinery's production and assay, not the individual bar, and the LBMA issues no certificate to a retail buyer.
The Royal Mint bar is stamped with the Britannia design, the same figure that appears on its Britannia gold coins.
What you actually pay
The spot price of one ounce, plus the refinery premium, plus our margin. Because the metal content matches the quoted unit exactly, this is the easiest weight on which to compare one dealer against another. Live prices on the gold price page.
Questions buyers ask about this weight
How much is a 1 oz gold bar worth?
The spot price of one troy ounce plus the premium on that bar. No conversion is needed — the bar holds exactly the unit the market quotes.
How many grams is a 1 oz gold bar?
31.1035 g. A troy ounce is heavier than the ounce used for everyday weights, which is 28.35 g.
How big is a 1 oz gold bar?
40.4 × 23.3 × 1.9 mm at Argor-Heraeus, 41.60 × 24.60 × 2.80 mm at the Perth Mint, 50.14 × 29.16 mm for the Royal Mint Britannia bar. The Perth Mint cast version is a block of no more than 19 × 19 × 5 mm.
Minted or cast at one ounce?
Minted, with one exception: the Perth Mint pours a cast one-ounce bar. Everywhere else casting starts at 50 g or 100 g and the ounce is pressed.
Do you buy one-ounce bars back?
Yes. This is the weight with the deepest resale market, and it is quoted against the current spot price. See the buyback page.
Other gold bar weights
0.5 g · 1 g · 2 g · 2.5 g · 5 g · 10 g · 20 g · 50 g · 100 g · 250 g · 500 g · 1 kg
All weights are listed together on the gold bars page. For coin formats in the same metal, see gold coins.
