100g Gold Bar: Price, Specs & Buying Guide (2026)

How much is a 100g gold bar worth?

A 100g gold bar is worth about $13,051 at a gold spot price of $4,059 per troy ounce (15 July 2026). That is its melt value — the raw metal content. You will pay a small premium over this to a dealer, and receive slightly under it when you sell. Gold trades continuously, so check a live price before buying.

How do you calculate the value of a 100g gold bar?

Divide the bar's weight in grams by 31.1035 to get troy ounces, then multiply by the spot price. For a 100g bar: 100 ÷ 31.1035 = 3.21507 troy oz, then 3.21507 × spot. At $4,059/oz that gives $13,051. This formula works for any bar at any spot price, which is why it's more useful than a fixed figure.

• Troy ounces = grams ÷ 31.1035
• Melt value = troy ounces × spot price per ounce
• Your price = melt value + the dealer's premium

What are the exact specifications of a 100g gold bar?

A 100g investment gold bar is 999.9 fine (24 carat) and contains 3.21507 troy ounces. Because gold's density is 19.32 g/cm³, 100 grams of it occupies only 5.18 cm³ — roughly the size of a credit card but a few millimetres thick. A minted PAMP Fortuna 100g measures approximately 47 × 27 × 4.3 mm.

• Fine gold content: 100 g = 3.21507 troy oz
• Purity: 999.9 (99.99% gold)
• Volume: 5.18 cm³ (gold density 19.32 g/cm³)
• Minted bar size: ~47 × 27 × 4.3 mm (indicative — cast bars vary and are thicker/irregular)

What premium over spot should you pay for a 100g gold bar?

Expect roughly 2–4% over spot for a 100g gold bar from a mainstream dealer. That sits between a one-ounce bar (typically 2–5%) and a kilo bar (often under 1.5%). Premiums are indicative and move with demand, refiner brand and whether the bar is cast or minted — always compare the all-in price, not the headline premium.

Why is the 100g bar considered the sweet spot?

The 100g bar balances cost and flexibility better than any other size. It carries a premium close to a kilo bar's, but costs about one tenth as much — roughly $13,000 versus $130,000 at July 2026 prices. That makes it attainable for ordinary buyers while still being cheap per gram, and it's a size almost every dealer will quote a two-way price on.

• Cheaper per gram than 1 oz bars and fractional coins
• Affordable versus a kilo bar's six-figure outlay
• Liquid — widely recognised and easy to sell
• Divisible in practice — buy several 100g bars instead of one kilo and you can sell in tranches

Which 100g gold bar should you buy?

Choose an LBMA Good Delivery refiner and buy it sealed in its assay card with the serial number intact. PAMP Suisse and Valcambi carry the strongest brand recognition for resale; Metalor, C. Hafner and UBS often price a little keener. All are 999.9 fine, so the metal is identical — you are choosing recognition, security features and premium.

Cast or minted 100g bar — which is better?

Minted bars are stamped from rolled strips, have sharp edges and a mirror finish, and come sealed in a tamper-evident assay card — at a slightly higher premium. Cast bars are poured into a mould, look rustic and individual, and cost a little less. For a 100g bar, either resells easily; the important rule is never break the assay seal, as an opened bar can lose its certification premium.

Where can you buy a 100g gold bar with crypto?

BTC Mints currently stocks twelve different 100g gold bars — including PAMP Fortuna, Valcambi (cast, minted and Green Gold), the Argor-Heraeus Kinebar and minted, Metalor, the Royal Mint Britannia 100g, UBS and the Valcambi 100×1g CombiBar. Every one is 999.9 fine, priced live against the spot figures above, and payable in Bitcoin, Monero, Ethereum or stablecoins with no account needed for standard orders.

• Browse the 100g gold bars collection
• Pay with Bitcoin or Monero — priced live, no card or FX fees
• Shipped fully insured in discreet, unmarked packaging with a certificate of authenticity
• Compare sizes in our best gold bars guide or step up to a kilo bar