Stacker Guides · Bars
How Much Does a Silver Bar Weigh? Every Size, From 1 Ounce to the 1,000-Ounce Bar
A 100-ounce silver bar weighs nearly 7 pounds and takes up about as much room as two and a half sticks of butter. The big 1,000-ounce bar in the London vaults weighs about as much as a 10-year-old and is worth about as much as a new car.
By Joel Perkes · · 4 min read
Silver is about a seventieth the price of gold, so to hold any real money in it you need a lot of it. That is why silver bars run much bigger than gold bars, and why a serious silver stack eventually needs a stronger shelf.
A 1 oz silver bar weighs 31.1 grams. A 10 oz bar weighs 0.69 pounds, a kilo bar 2.2 pounds, and a 100 oz bar 6.86 pounds (3.11 kilograms). The big bars that banks and exchanges trade weigh about 1,000 troy ounces, roughly 68.6 pounds, and each holds anywhere from 750 to 1,100 ounces. At $54.05 an ounce (October 24, 2026), a 100 oz bar held $5,405 of silver and a 1,000 oz bar about $54,050.
Silver bar sizes and what each is worth
| Bar | Troy oz | Pounds | Kilograms | Worth |
|---|---|---|---|---|
| 1 ounce | 1 | 0.069 | 0.031 | $54.05 |
| 5 ounces | 5 | 0.343 | 0.156 | $270.25 |
| 10 ounces | 10 | 0.686 | 0.311 | $540.50 |
| 1 kilogram | 32.15 | 2.205 | 1.000 | $1,737.75 |
| 100 ounces | 100 | 6.857 | 3.110 | $5,405.00 |
| 1,000 ounces | 1,000 | 68.57 | 31.10 | $54,050.00 |
The weights are troy ounces, the unit precious metals are sold in; a troy ounce is about 10% heavier than a kitchen ounce. To convert any other size, use the troy ounce converter, which also prices it at today’s spot in your currency.
How much does a 100 oz silver bar weigh, and how big is it?
A 100 oz bar weighs 6.86 pounds, a little less than a gallon of milk’s 8.6. Silver is about ten and a half times as dense as water, so the bar takes up only about 300 cubic centimeters, roughly 18 cubic inches: about two and a half sticks of butter. The exact shape depends on the maker, and cast 100 oz bars are usually longer and lumpier than minted ones.
The 100 oz bar is the most popular large size with individual buyers, because it carries one of the lowest premiums per ounce. Over June 2025 to October 2026, the lowest price tracked each month by FindBullionPrices for a 100 oz bar ran from 0.86% under spot to 3.53% over.
The 1,000-ounce bar: what banks and exchanges trade
The silver that changes hands between banks in London is held as London Good Delivery bars: each between 750 and 1,100 troy ounces, at least 99.9% silver, made by an approved refiner, and stamped with the refiner’s mark, a serial number, its fineness and its exact weight. In practice most weigh close to 1,000 ounces, about 68.6 pounds, which is roughly what an average 10-year-old weighs. COMEX silver futures in New York are delivered in similar bars, five to a contract of 5,000 ounces.
London’s vaults held about 28,985 tonnes of silver in early October 2026, some 932 million ounces in about 966,000 bars. Laid end to end, at roughly a foot each, they would stretch about 180 miles.
Cast vs minted silver bars
A cast bar is poured from molten silver into a mold and cooled, which leaves a rough, sometimes wavy surface and slightly rounded edges. Cast bars are cheaper to make, so they usually carry a lower premium. A minted bar is cut from a rolled sheet and struck in a press, like a coin: sharp edges, a mirror or frosted design, and often a sealed card. Minted bars cost a little more and are easier to stack neatly. Both hold exactly the silver stamped on them.
A few older bars, such as Engelhard and Johnson Matthey bars, sell for more than newer ones because collectors like them. That extra is a collector premium, not more silver.
Which size makes sense?
This is a trade-off rather than a right answer. Small bars and coins cost more per ounce, because making and shipping a 1 oz piece costs almost as much as a 100 oz one, but you can sell them a few at a time. A 100 oz or kilo bar costs less per ounce, but you have to sell the whole thing at once, and some buyers test large bars before paying. Our guide to premiums over spot shows how the cost per ounce falls as bars get bigger, and the premium calculator works out the round trip for any price.
Silver bars at Costco
Costco has sold 10 oz and 100 oz silver bars online to members, and since 2026 a Kirkland Signature 1 oz bar in packs of five, with a limit of one 100 oz bar per 24 hours in September and October 2026. The Costco calculator works out the real price after the Executive reward and card cash back.
Fake silver bars
Bars are easier to fake than coins because there is no single official design. Weigh and measure a bar against the maker’s specifications, try the magnet test (silver isn’t magnetic), and listen for the ring. Our guide to telling if silver is real covers each test, and which ones fool people.
Outside the US
- United Kingdom: silver bars carry 20% VAT, unlike investment gold, so a bar bought in Britain starts a fifth above the price of the silver in it.
- European Union: silver bars carry VAT at each country’s standard rate, so many European buyers choose kilo bars held in a bonded vault, where VAT isn’t charged while the bar stays there.
- Canada and Australia: silver bars of high enough purity in investment form are GST-free.
- Kilo bars are the common large size in Europe, Asia and Australia, where people buy in grams and kilos; the 100 oz bar is mostly an American size.
Our premium guide has the full tax table by country.
Sources
- Good Delivery silver bar rules (750 to 1,100 oz, 999 minimum, stamps): LBMA, Good Delivery; London vault holdings, October 2026: LBMA London vault data.
- COMEX silver futures, 5,000 oz contract: COMEX Rulebook, Chapter 112 (silver futures).
- 100 oz bar premiums, June 2025 to October 2026: FindBullionPrices monthly lowest prices, as summarized in our premium guide.
- Costco silver bars and limits: Gramercy Gold, Sep 27, 2026; CostRefund, Oct 22, 2026.
- Silver price $54.05 an ounce on October 24, 2026: gold-api.com. Density of silver 10.49 g/cm³; one troy ounce is 31.1034768 g.
Questions people actually ask
How much does a silver bar weigh?
It depends on the size. A 1 oz bar weighs 31.1 grams, a 10 oz bar 0.69 pounds, a kilo bar 2.2 pounds, a 100 oz bar 6.86 pounds, and the 1,000 oz bar traded between banks about 68.6 pounds.
How much does a 100 oz silver bar weigh?
A 100 troy ounce silver bar weighs 3.11 kilograms, or 6.86 pounds. It takes up about 300 cubic centimeters, roughly two and a half sticks of butter.
How much is a 100 oz silver bar worth?
At $54.05 an ounce on October 24, 2026, a 100 oz bar held $5,405 of silver. Dealers sell 100 oz bars for a little over spot and buy them back for a little under it.
How much does a 1,000 oz silver bar weigh?
About 68.6 pounds, or 31.1 kilograms. London Good Delivery silver bars may hold anywhere from 750 to 1,100 troy ounces, so each is stamped with its exact weight.
How much is a kilo of silver worth?
A kilo is 32.15 troy ounces, so at $54.05 an ounce on October 24, 2026 it held about $1,737.75 of silver.
What size silver bar is best to buy?
It is a trade-off. Bigger bars cost less over spot per ounce, but you have to sell them whole. Small bars and coins cost more per ounce but can be sold a few at a time.
What is the difference between cast and minted silver bars?
A cast bar is poured into a mold and looks rough; a minted bar is cut from sheet and struck like a coin, with sharp edges and a design. Cast bars usually cost a little less. Both hold the silver stamped on them.
How pure are silver bars?
Most are 99.9% silver, stamped .999 fine; some are 99.99%. The 1,000 oz bars traded in London must be at least 99.9% silver.
