Gold Bar Sizes: From 1 Gram to 400 Ounces

The Full Gold Bar Size Ladder

Gold bars are produced in a wide range of sizes, from fractional gram pieces small enough to sit on a thumbnail to institutional 400-ounce bars worth over a million dollars apiece. The table below covers every size commonly available to private buyers in the United States, plus the London Good Delivery standard used in professional interbank markets.

Premium percentages shown reflect typical retail ranges observed across major US dealers. Actual premiums vary by dealer, market conditions, and quantity purchased. Verify current premiums directly with your dealer before buying. Dimensions are approximate and vary by refiner.

Why Premium Percentage Drops as Bar Size Rises

The premium you pay above spot price is not arbitrary. It covers fabrication costs for turning refined gold into a finished bar, the assay and hallmarking process, packaging, dealer distribution margins, and refiner profit. These costs are largely fixed per bar regardless of weight.

A 1 gram bar requires essentially the same design process, die-cutting, assay card, blister packaging, and logistics as a 1 troy ounce bar. When you divide a $15 fabrication cost across roughly $95 worth of gold at $3,000 per troy ounce spot price, that fabrication adds about 16% to the metal’s market value. Divide the same $15 across $3,000 worth of gold in a 1-ounce bar, and it accounts for only 0.5% of the total cost.

This is why 1 gram bars consistently carry premiums of 40% or more: most of what you are paying is fabrication, not gold. At that premium level, the spot price of gold would need to rise by nearly half before a break-even resale becomes possible.

The crossover point where premiums become more reasonable for long-term holding is generally in the 10 gram to 1 troy ounce range, where typical premiums fall below 15%. Buyers who prioritize cost efficiency over flexibility find that 100 gram and kilogram bars offer the thinnest premiums available in the private retail market.

Minted Bars vs Cast Bars

Gold bars fall into two main manufacturing categories, and the distinction matters for resale, storage, and verification.

Minted bars (sometimes called pressed bars) are cut from a precisely rolled gold sheet, then stamped or die-struck to create a smooth, uniform finish. Most minted bars come sealed in a tamper-evident assay card or blister pack. PAMP Suisse, the Royal Canadian Mint, and the Perth Mint are among the most widely recognized producers of minted bars. Their uniform appearance and tamper-evident packaging make them straightforward to authenticate, and many dealers pay a slight premium for bars in original, unbroken seals.

Cast bars (sometimes called poured bars) are produced by pouring molten gold into a mold and allowing it to cool. They tend to have a rougher, more textured surface with visible grain structure and minor irregularities. Each cast bar is slightly unique in appearance. Cast bars dominate the larger size ranges (250 grams and above) because they are less expensive to produce at scale. The refiner stamps the bar directly with weight, fineness, serial number, and refiner mark.

Both types are equally valid as gold ownership at the same purity. The practical differences worth knowing:

• Minted bars in original sealed packaging typically command slightly better resale premiums because their condition is verifiable without opening the seal.
• Cast bars are generally less expensive to purchase but may require more thorough inspection by buyers who cannot rely on tamper-evident packaging.
• For self-directed IRA purposes, both minted and cast bars are eligible if they meet the minimum fineness of 995 parts per thousand (99.5% pure gold) required under IRS Publication 590-A.

Assay Cards and Serial Numbers: What They Are and Why They Matter

An assay card is a sealed certificate that encases a minted gold bar. It typically contains:

• The refiner’s name and logo
• The bar’s weight in grams and troy ounces
• The fineness (purity) expressed as a decimal or parts-per-thousand figure
• A unique serial number
• The refiner’s assay stamp confirming the purity was independently tested at the time of production

Serial numbers serve two purposes. First, they allow a bar to be traced back to a specific refining batch and assay record. Second, they deter counterfeiting: a dealer can cross-reference a bar’s serial number against the refiner’s records. Some refiners provide public databases for this purpose; PAMP Suisse, for example, offers an optical authentication system for verifying bars against registered images.

When buying, confirm that the serial number printed on the assay card matches the number stamped directly on the bar itself, which is typically visible through a window in the card. When selling, most dealers accept bars in original sealed assay cards at a slight premium over bare bars because the sealed condition reduces the verification burden.

A word on handling: opening an assay card significantly reduces a bar’s marketability with certain dealers who prefer verifiable, original packaging. Unless you have a specific reason to open the card (such as independently weighing or testing the bar), keeping it sealed preserves its convenience and resale value.

The London Good Delivery Bar: The 400-Ounce Professional Standard

The London Good Delivery bar is the international benchmark for gold traded between central banks, bullion banks, and exchange-traded funds. It is the bar type that underpins the global wholesale gold market and is what people typically mean when they refer to a “bank vault” bar.

The commonly cited “400-ounce” figure is a round-number shorthand used in financial reporting and news coverage. The actual LBMA specification allows bars between 350 and 430 troy ounces, because bars naturally vary in weight when cast. At a spot price of $3,000 per troy ounce, a single Good Delivery bar is worth roughly $1.05 million to $1.29 million, which explains why these bars do not circulate in private retail markets.

Good Delivery bars must come from a refiner on the LBMA’s approved list and must bear the refiner’s assay stamp, a unique serial number, the year of manufacture, and the fineness mark. Bars that lose their chain of custody (by leaving the approved vault network) are re-assayed before re-entering the LBMA system, adding cost and time.

Private investors encounter Good Delivery bars indirectly through gold ETFs. The SPDR Gold Trust and similar funds hold their gold as LBMA Good Delivery bars stored in approved vaults. When you buy a gold ETF share, you own a fractional claim on bars in that vault. For direct physical ownership, the largest size a private buyer will realistically purchase and resell through normal dealer channels is the 1 kilogram bar.

Selling Gold Bars: The Form 1099-B Reporting Consideration

When a private investor sells gold bars to a dealer, the dealer may be required to file Form 1099-B with the IRS reporting the transaction. This is an information report, not a new tax. The seller remains responsible for reporting any capital gain or loss on their own tax return, typically on Form 8949 and Schedule D.

Whether a gold bar sale requires a dealer-filed 1099-B depends on the specific form of bar and the quantity sold. Per the IRS Form 1099-B instructions, a sale of precious metals is reportable only when two conditions are both met:

1. The metal is in a form for which the Commodity Futures Trading Commission (CFTC) has approved a regulated futures contract.
2. The quantity sold meets or exceeds the minimum amount required to satisfy one such CFTC-approved contract.

Gold bars meet condition (a). For condition (b), the CME Group (which operates COMEX) offers CFTC-approved futures contracts that include both a standard 100-troy-ounce gold contract and a 1-kilogram gold contract. Because a 1-kilogram (32.151 troy ounce) gold bar can satisfy a CFTC-approved contract, a sale of a kilogram bar or bars may meet the reporting threshold and prompt a dealer-filed 1099-B.

Single bars in sizes below a kilogram (100 grams, 50 grams, 1 troy ounce, and smaller) would not meet the minimum contract size of the smallest available CFTC-approved gold contract based on the current CME Group product specifications.

This is one reason some private holders prefer to build their gold position in 1 troy ounce or 100 gram bars: individual sales below the reporting threshold may require less dealer paperwork. However, the tax owed on a realized gain is determined by the actual profit and the applicable rate, not by whether a 1099-B is filed. Filing does not create tax; it reports it. Physical gold sold at a profit is taxed at the 28% federal rate for collectibles under the Internal Revenue Code, regardless of holding period.

Consult your tax advisor for your specific situation before making any purchase or sale decisions based on tax considerations.

The Divisibility Problem: Why a Kilo Bar Cannot Be Sold in Pieces

One of the most consequential practical distinctions between bar sizes is divisibility. A 1 troy ounce bar can be sold in one transaction, delivering its full value when you need funds. A kilogram bar represents approximately the same value as 32 individual one-ounce bars, but it can only be sold as a single unit. You cannot sell 10% of it.

If you own a kilogram of gold as a single kilo bar and you need $10,000, you must sell the entire bar (worth roughly $96,000 at a $3,000 spot price) to access any of that value. You cannot shave off a fraction for the amount you need.

This liquidity asymmetry is why dealers and financial educators frequently suggest that buyers who may need to liquidate incrementally build their holdings in 1-ounce or 100-gram units rather than exclusively in larger bars. The tradeoff is real: you will pay a meaningfully higher premium to own the same total weight in 1-ounce bars versus a single kilo bar, often three to six percentage points more depending on market conditions.

A practical comparison of how bar size affects flexibility when managing the same 100-gram gold position:

The right configuration depends on your goals. Buyers building a store-of-value position with no intention of partial liquidation benefit from larger, lower-premium bars. Buyers who view their gold as a liquid reserve may prefer accepting a higher purchase premium in exchange for the ability to sell in small, discrete increments.

If you are looking for verified gold dealers who buy and sell bars in your area, the Goldiew gold dealer directory lists dealers across the United States with information on the bar sizes they trade.

Choosing a Bar Size: A Practical Framework

There is no single correct bar size. The right choice depends on budget, time horizon, and how you expect to eventually liquidate your position. The following framework reflects how experienced buyers approach the decision; it is not financial advice, and your situation may differ.

First-time buyers

The 1 troy ounce bar from a major refiner (PAMP Suisse, Valcambi, the Royal Canadian Mint, or the Perth Mint are among the most widely recognized) is the natural starting point for most first-time buyers in the US. These bars are accepted at virtually all bullion dealers, carry a moderate but reasonable premium, and are globally recognized. Starting here creates a foundation that can be added to in any size without locking you into a position you cannot divide later.

Buyers scaling an existing position

Once you have a base of 1-ounce bars, consider adding 100-gram bars to improve your cost average per gram. Most US dealers trade 100-gram bars without hesitation, and the premium advantage over 1-ounce bars can be meaningful across a larger purchase.

Buyers prioritizing cost efficiency

The 500-gram and kilogram bars offer the lowest premiums available to private buyers in the retail market, typically 1.5% to 3% above spot. Accept that selling requires finding a buyer for a higher-value single item, and be aware of the 1099-B considerations above. For buyers who do not need liquidity flexibility, these are efficient formats.

Small bars for gifts

Bars in the 1 gram to 10 gram range are popular as gifts and symbolic purchases, but their high premiums (40% to 60%+ for 1-gram bars) make them poor vehicles for building real gold value over time. If the purpose is genuine financial accumulation, even a single 1-ounce bar delivers far more metal value per dollar spent than ten 3-gram bars at the same total cost.