100 gram gold bar: price, sizes and cast vs minted

The 100 g bar is where many people move from "buying some gold" to holding a serious amount. It costs about as much as a small car, its premium is close to that of much bigger bars, and it is still small enough to sell on its own. It is also the size where you get a real choice between cast and minted bars from the same maker. Below: dimensions from the refiners, live value, the prices we captured on 12 October 2026, cast against minted, and how a 100 g bar compares with three 1 oz bars or a kilo.

How big is a 100 gram gold bar?

Small for its value. A 100 g bar fits easily in the palm. The shape depends on how it is made, so we list each refiner's own published figures.

The Perth Mint gives maximum dimensions within its tolerances. The Royal Mint does not publish thickness. Compare every size in our gold bar sizes guide.

Notice the cast bar is the most compact. Casting pours gold into a small, deep mould, so the bar is thick and short. Minting rolls gold into a thin strip and stamps out a wider, flatter bar with room for a design. Both hold the same gold.

What is a 100 gram gold bar worth today?

Its gold value is 100 grams times the live spot price, the wholesale market price of gold.

Spot-based melt values, not dealer prices. Last updated: Loading.

What did 100 gram gold bars cost on 12 October 2026?

Our automated check read the single-bar price on each dealer's product page between 06:39 and 06:42 UTC on Monday 12 October 2026, at the cheapest payment method shown, and compared it with the gold-api.com spot price at that time. The premium is how much more than the gold value you pay.

Spot used (gold-api.com): US$4,186.00, £3,163.29, C$5,963.34 and A$5,997.24 to A$5,999.10 per troy ounce. Premium = price / (100 g x spot per gram) - 1. The Perth Mint minted price was read at 06:35 UTC. Repeat checks: premium tracker.

The cheapest and dearest bars here differ by about 4.4 percentage points, which on a 100 g bar is real money. In the UK, the same weight of gold cost £266.14 more from the Royal Mint direct than from Hatton Garden Metals that morning. The Royal Mint's prices include free delivery and the option of storage in its own vault, which some buyers value, but on price alone a dealer was cheaper. Our explainer on gold premiums covers what you pay for.

Check 100 g bars at Hatton Garden Metals

Cast or minted: which 100 g bar is better?

Neither is purer; both are 99.99% gold. The differences are cost, looks and packaging.

The cast bar saved A$56.94. Cast bars are usually stamped with a serial number and sold with a certificate rather than sealed in a card; minted bars are sealed in tamper-evident packaging. If you plan to store in a vault, cast is the natural choice. If you want something to inspect at home or sell to a high-street dealer, a sealed minted bar can be simpler. More in cast vs minted bars.

Is a 100 g bar better than three 1 oz bars or one kilo?

A 100 g bar is 3.215 troy ounces, so three 1 oz bars hold slightly less gold (93.3 g). At the Perth Mint on 12 October 2026, its cast 1 oz bar cost A$6,162.81, a 2.76% premium, against 2.21% for the cast 100 g bar. Three 1 oz bars would have cost A$18,488.43 for 93.3 g; the 100 g bar A$19,707.25 for 100 g.

For many buyers a handful of 100 g bars is a practical middle path: the premium is near kilo-bar levels, yet you can sell one bar at a time. The best gold bars to buy guide puts these sizes side by side with brand choices.

Who is a 100 gram gold bar right for?

• Good fit: buyers putting in a five-figure sum who want a low premium without tying it all up in one kilo bar.
• Good fit: vault storage users, where cast 100 g bars stack neatly and cost least.
• Less ideal: UK buyers expecting large gains. Bars are liable to Capital Gains Tax, while Britannia and Sovereign coins are not.
• Less ideal: anyone who might need to sell small amounts; smaller bars or coins give more flexibility.

How are 100 g gold bars taxed in each country?

This is general information, not tax advice. Country detail: where to buy gold in the US, the UK, Canada and Australia.

How do you check, store and sell a 100 gram bar?

1. Keep the paperwork. Match the serial number on the bar to its certificate or card, and keep the invoice. See what an assay card is.
2. Check size and weight against the refiner's figures above. A fake with the right weight rarely has the right dimensions. See how to tell if gold is real.
3. Store it properly. At this value, check your insurance limit or consider a vault; compare options in the gold storage guide.
4. Know the buyback. On 12 October 2026 Hatton Garden Metals offered £9,760.56 for a 100 g bar, about 4% below spot, in line with the 4.27% discount it listed for all bars from 1 g to 1 kg on 11 October. Bought from that dealer and sold straight back, you would recover about 93% of the price. See selling gold bars.

Other weights and brands are in all gold bar guides.

Not financial advice. GoldVetted provides general information to help you compare options. It is not personal financial, tax or legal advice. Gold prices go down as well as up, and you may get back less than you pay. Check tax rules with the official source or a qualified adviser before you act.