coin guide

Silver Bar Sizes

Silver bar sizes for individual buyers run from 1 gram to 100 troy ounces, with 1 oz, 10 oz, 1 kilo (32.15 troy ounces) and 100 oz the standard sizes. Larger bars generally cost less per ounce. Smaller bars let you sell in smaller pieces. A useful test when choosing is the largest bar you'd be content to sell whole.

Silver Bar Sizes in Troy Ounces and Grams

A bar's stated weight is its silver content, and one troy ounce is 31.1035 g in NIST's conversion tables. The table covers every size with its own page in our catalog of silver bars, from 1 gram to 10 kilo.

Between the four standard sizes sit 2 oz and 5 oz silver bars, along with gram bars that don't land on round ounces. The kilo is the one to watch. By the same NIST factor it's 32.15 troy ounces, 2.15 more than three 10 oz bars hold, so divide a kilo's price by 32.15, not 32, before you compare it with ounce bars.

Sizes Above 100 Troy Ounces

Above 100 oz, our catalog lists 10 kilo silver bars, each 321.51 troy ounces. Past that is the wholesale market's bar. Under the rules in force since January 1, 2025, a London Good Delivery silver bar is 1,000 troy ounces with a tolerance of plus or minus 10%, so a real one weighs from 900 to 1,100 troy ounces and is priced on its own recorded weight.

That bar, about 300 mm long, 130 mm wide and 80 mm high, is the form in which refined silver is most commonly available, per the U.S. Geological Survey's silver profile. The LBMA's Good Delivery lists cover no other product an accredited refiner makes, so a 10 oz or 100 oz bar from such a refiner isn't a Good Delivery bar.

What the Four Standard Sizes Look Like in Hand

No weight has a standard footprint, so each bar below is one maker's published example.

1 Troy Ounce Bars

Among 1 oz silver bars, Valcambi's minted bar is 47.00 mm long, 27.00 mm wide and 2.70 mm thick. It ships in a blister with a serial-numbered certificate, 25 to a box, and The Perth Mint sells its 1 oz Kangaroo bar in tubes of 20.

10 Troy Ounce Bars

10 oz silver bars are where shape splits in two. The 10 oz bar from the Royal Canadian Mint is a thin slab, 90.0 mm long, 51.9 mm wide and 7.1 mm thick, the shape minted bars take. The Perth Mint's cast 10 oz bar is a short block of up to 63 mm long, 36 mm wide and 16 mm thick, and the Mint gives those figures as maximums because cast bars vary.

1 Kilo Bars

The Perth Mint's cast kilo bar is up to 99 mm long, 49 mm wide and 22 mm thick, and it's packed 10 to a monster box. That's a little more silver than three 10 oz bars in one piece under 100 mm long. Other 1 kilo silver bars are longer and thinner, which matters for testing.

100 Troy Ounce Bars

100 oz silver bars are the largest of the four. Asahi Refining's 100 oz cast bar is 178 mm long, 77 mm wide and 22 mm thick, and each one carries a unique serial number and a certificate of assay. Its 3,110.35 g of silver come to 6.86 lb (3,110.35 divided by the 453.59 g in a pound). Valcambi's 100 oz cast bar has no serial number and is packed five to a box: 500 troy ounces and about 34.3 lb before the box.

How Premium Changes With Bar Size

Spot is the cash price for immediate delivery of metal, and a premium is the amount charged over it. The premium covers minting, distribution and the seller's margin. In The Royal Mint's words, larger products are generally easier to produce and cheaper per ounce than smaller ones. One 100 oz bar is made, packed and handled once. The same silver as 1 oz bars goes through every step 100 times.

Format matters as well as weight. A cast bar usually carries a lower premium than a minted one, which is cut from rolled sheet, stamped and often sealed in an assay card. Two 10 oz bars can sit at different premiums for that reason alone.

Neither effect comes with a fixed number, so compare on the day. Take each bar's full price, shipping included, and divide it by its troy ounces. That's the CFTC's advice in practice: compare the actual weight and the price.

Why Large Bars Save Less Storage Space Than Expected

Silver takes up the same room whatever size the bar is. Pure silver has a density of 10.49 grams per cubic centimeter, so every troy ounce occupies 2.97 cubic centimeters (31.1035 divided by 10.49), in one bar or in 100.

Multiply out the dimensions Valcambi publishes for its 1 oz bar and you get 3.43 cubic centimeters, so 100 bare bars need about 343. One Asahi 100 oz bar, at the dimensions given earlier, multiplies out to about 302, a saving near 12%. What fills a safe with small bars is packaging: blister cards, capsules and tubes.

The contents of a bank safe deposit box aren't covered by FDIC deposit insurance, and the same guidance says no box or home safe is completely protected from theft, fire or flood. Silver also reacts with sulfur-bearing gases in the air and tarnishes, so bars keep best sealed in the tubes, capsules or cards they came in. Tarnish is a surface film and doesn't change the silver content.

How Bar Size Affects Resale

A bar is sold whole. Hold 100 troy ounces as one bar and the only sale you can make is all 100. Hold the same silver as 10 separate 10 oz bars and you can sell 10 ounces, or 40, and keep the rest.

The price you sell at isn't spot. As the CFTC's advisory on buying physical metals puts it, a seller prices metal above spot and buys it below spot, the gap is the spread, and each seller sets its own. So check the bid for the exact size before you buy it.

On our two-way market, product pages show a bid/ask spread, so the cost of getting out is visible on the day you get in. Our minimum selling transaction is $1,000, which matters most if you plan to sell small bars a few at a time.

Why Thicker Bars Are Harder to Verify

An electronic verifier sends a signal below a bar's surface to look for plating or an insert. How far it reads depends on thickness. One professional unit reads all the way through samples up to 12.50 mm thick with its onboard sensors. Past that it needs an external bridge, which its maker rates to 45 mm and names for 100 oz silver bars.

The Royal Canadian Mint's 10 oz bar, at 7.1 mm, can be read right through, and so can Valcambi's minted kilo at 11.20 mm. The Perth Mint's cast 10 oz bar at up to 16 mm can't, and neither can a 22 mm cast kilo or 100 oz bar. Shape decides this as much as weight does. A thin minted kilo is easier to read than a thick cast 10 oz bar.

Our catalog includes metal testers, and each has a thickness limit worth matching to the bars you hold.

How to Decide Which Size Fits Your Budget and Goals

Put the budget in ounces first. Divide it by the day's price per troy ounce for each size, then look at the choice in bars: 100 troy ounces can be one bar, 10 bars or 100.

Larger bars generally buy more silver for the same money. A stack of 1 oz or 10 oz bars lets you sell part and keep part, and the thin minted ones are the easiest to verify. If you'd only ever sell everything at once, divisibility is worth little. If you might sell in parts, the largest bar you'd be content to sell whole sets the ceiling, and a budget can be split between sizes.

Bars bought for a retirement account follow a different rule. Size isn't part of it. The tax code lets an IRA hold silver bullion only if it meets a minimum fineness and stays in the physical possession of the IRA's trustee, so a bar kept at home isn't IRA metal at any size. We're not a registered investment advisor and can't give individual investment or tax advice, so speak with a tax professional or financial advisor.

Silver Bars on Our Marketplace

Every bar we sell, from 1 gram to 10 kilo, is verified with modern testing equipment and numismatic expertise and covered by our authenticity guarantee for the weight, fineness and purity advertised.

Frequently Asked Questions

What is a kilo of silver?

A kilo of silver is 1,000 g, which converts to 32.15 troy ounces, the unit silver is priced in. It isn't 32, which drops the fraction, and it isn't 35.27, which is a kilogram in everyday ounces. The Perth Mint lists its kilo bar at 32.151 troy ounces of silver, with a minimum gross weight of 1,000.200 g.

How many ounces is a silver bar worth?

A bar is worth its troy ounces multiplied by the spot price, plus a premium when you buy and less the spread when you sell. Size fixes the ounces: 1, 10 or 100 for ounce bars, 32.15 for a kilo and 321.51 for a 10 kilo bar. Spot is quoted in dollars per troy ounce, and you can follow it on our live silver price charts.

Is .9999 silver better than .999 in a bar?

The gap is at most nine ten-thousandths of the bar, or 0.09% of the metal. The London minimum for a wholesale silver bar is 999.0 parts per thousand, and bars from The Perth Mint and the Royal Canadian Mint are 99.99%. Either way a bar is priced on its stated troy ounces, so the extra nine is a maker's specification, not a meaningful amount of extra silver.