Silver Price Per Ounce Explained: Troy Ounce vs Gram (2026)
Silver is priced in troy ounces, not standard ounces. Convert silver price per ounce to grams, calculate value by purity and weight, and understand live spot price.
Silver is quoted in troy ounces, not the standard ounces used for everyday weight measurement. A troy ounce is heavier than a standard ounce: 31.1035 grams versus 28.3495 grams. If you use the wrong conversion when calculating silver value, you will be off by about 10% on every piece you weigh. This guide explains what the silver price per ounce actually means, how to convert it to grams, and how to use it to calculate the value of silver at any purity.
For a live calculation that applies the current spot price automatically, use the Silver Calculator.
What Is a Troy Ounce? Why Silver Uses a Different Weight
The troy ounce system originates from the medieval European market town of Troyes, France, which was a major trading hub for precious metals in the 12th century. The weight standard used there became the international convention for gold, silver, and platinum. It has remained the global standard ever since, used by commodity exchanges, refiners, and dealers worldwide.
Standard ounces (avoirdupois ounces) are used for everyday goods: food, postal weights, household items. The avoirdupois pound contains 16 ounces, each 28.3495 grams. The troy pound contains 12 troy ounces, each 31.1035 grams.
Key comparison:
| Unit | Grams | Notes |
|---|---|---|
| Standard ounce (avoirdupois) | 28.3495 g | Used for food, household weights |
| Troy ounce | 31.1035 g | Used for precious metals globally |
| Troy pound | 373.24 g | 12 troy ounces |
| Standard pound | 453.59 g | 16 standard ounces |
The practical implication: if you weigh a silver bar on a kitchen scale and get 2 ounces (standard), that bar weighs 56.699 grams, not 62.207 grams (which is 2 troy ounces). Using the standard ounce figure with a troy ounce spot price overstates the value by about 10%.
One troy ounce equals exactly 31.1034768 grams. In practice, 31.1035 is used as the conversion factor. If you remember one number from this guide, it is that one.
Silver Price Per Ounce vs Silver Price Per Gram
When a financial site reports "silver at $33.00," that price is per troy ounce. Converting to a per-gram price requires one division:
Price per gram = Spot Price per Troy Oz / 31.1035
At $33.00/ozt: $33.00 / 31.1035 = $1.0610 per gram
The per-gram price is useful when your scale measures in grams, which is the case for most jewelry scales and precision kitchen scales. It is also the unit used in most silver melt value calculations.
The conversion in the other direction:
Price per troy oz = Price per gram x 31.1035
If you know a dealer is offering $0.90/gram, the equivalent troy ounce price is 0.90 x 31.1035 = $27.99/ozt. This lets you compare a gram-based offer to the spot price you see quoted online.
Reference conversion table at selected spot prices:
| Spot (per troy oz) | Per gram | Per 10 grams | Per 100 grams |
|---|---|---|---|
| $24.00 | $0.7717 | $7.72 | $77.17 |
| $28.00 | $0.9002 | $9.00 | $90.02 |
| $31.00 | $0.9968 | $9.97 | $99.68 |
| $33.00 | $1.0610 | $10.61 | $106.10 |
| $35.00 | $1.1252 | $11.25 | $112.52 |
| $38.00 | $1.2218 | $12.22 | $122.18 |
| $42.00 | $1.3503 | $13.50 | $135.03 |
These figures apply to 999 pure silver. For 925 sterling, multiply by 0.925. For 900 coin silver, multiply by 0.900.
How to Calculate Silver Value Using Spot Price
With the spot price per gram, you can calculate the melt value of any silver item when you know its weight and purity. The formula:
Melt Value = Weight (grams) x (Purity / 1000) x (Spot Price / 31.1035)
Where: Purity is the hallmark number (999, 925, 900, 800)
Worked example 1: Sterling silver chain, 18 grams, $33/ozt.
- Purity: 925 / 1000 = 0.925
- Spot per gram: $33 / 31.1035 = $1.0610
- Melt value: 18 x 0.925 x $1.0610 = $17.64
Worked example 2: Fine silver bar, 31.1 grams (approximately 1 troy oz), $33/ozt.
- Purity: 999 / 1000 = 0.999
- Spot per gram: $1.0610
- Melt value: 31.1 x 0.999 x $1.0610 = $32.97
This result is close to the spot price, as expected for a 1 troy oz bar of fine silver.
Worked example 3: Coin silver (900 purity), pre-1965 US quarter, 6.25 grams, $33/ozt.
- Purity: 900 / 1000 = 0.900
- Melt value: 6.25 x 0.900 x $1.0610 = $5.97
The Silver Calculator runs this calculation for any weight, purity, and spot price combination without requiring manual arithmetic. It also includes preset purity options for 999, 925, 900, and 800, which covers the vast majority of silver items.
For detailed guidance on 925 specifically, see the 925 silver value guide.
Troy Ounce vs Standard Ounce: The Exact Difference
The 10% difference between troy and standard ounces creates real calculation errors if the wrong unit is used. Here is where errors commonly occur:
Error 1: Kitchen scale set to standard ounces. A digital kitchen scale in "oz" mode reads in standard ounces. If you weigh a silver item and get 3 oz, you have 3 x 28.3495 = 85.05 grams. If you mistakenly treat that as 3 troy ounces (3 x 31.1035 = 93.31 grams), you overstate the silver weight by 8.26 grams and overvalue the item accordingly.
Fix: Always use grams when weighing silver items on a kitchen or jewelry scale. Grams are grams regardless of whether you are using avoirdupois or troy systems. The distinction only matters when using "ounces" as the unit.
Error 2: Applying spot price to standard ounces. If spot is $33/troy oz and you weigh something as 2 standard oz (56.70g), the melt value is 56.70 x (33/31.1035) = $60.16, not 2 x $33 = $66. Using "2 oz" directly with the per-troy-oz spot price overstates value by about $5.84 on that 2 oz item.
Error 3: Confusing price per standard ounce with per gram. Silver sold by the gram is sometimes advertised as "$1.00/gram." A standard ounce has 28.35 grams, so "$1.00/gram" is equivalent to "$28.35/standard oz" or "$31.10/troy oz" at that spot level. These are equivalent quotes for the same metal price, just in different units.
The simplest approach: Weigh everything in grams. Look up spot price per troy oz. Divide spot by 31.1035 to get price per gram. Multiply by weight in grams, then by purity decimal. This eliminates all troy/standard confusion.
| Conversion | Factor |
|---|---|
| Troy oz to grams | x 31.1035 |
| Grams to troy oz | / 31.1035 |
| Standard oz to grams | x 28.3495 |
| Standard oz to troy oz | x 0.91146 |
| Troy oz to standard oz | x 1.09714 |
How Spot Price Affects Scrap and Jewelry Silver Value
The silver spot price is the price at which silver is traded on commodity exchanges, specifically the COMEX exchange in New York and the London Bullion Market Association (LBMA) in London. It represents the price for immediate delivery of 5,000 troy ounces (one standard futures contract) and is updated continuously during trading hours.
Who sets the spot price: It is determined by supply and demand on commodity markets. Industrial demand (electronics, solar panels, medical equipment), investor demand (ETFs, bars, coins), and mining supply all affect the price. The daily London Fix, set at 12:00 noon London time, is a widely referenced benchmark for settlement prices.
How spot price changes affect your silver:
At $33/ozt, a 100-gram sterling bracelet has a melt value of $91.06. If spot rises to $38/ozt, the same bracelet melt value becomes $104.88, an increase of $13.82 (15.2%). Silver value scales directly with spot price.
For sellers holding a large amount of silver, a $5/ozt move matters significantly. A 1 kg lot of sterling silver (925) changes in value by approximately:
- $5/ozt increase: $148 more in melt value
- $10/ozt increase: $297 more in melt value
Where to find the current spot price:
Live silver prices are available on Kitco (kitco.com), APMEX (apmex.com), and Bloomberg Markets. Most financial data services (Yahoo Finance, Google Finance) also show the XAG/USD price, which is the silver spot price in US dollars. The Silver Calculator pulls the current price automatically when calculating melt values.
Spot price timing: Prices change during trading hours. If you are calculating for a transaction, use the price at the time you are discussing the deal, not a price from earlier in the day. A $0.50/ozt move during the day changes the melt value of a 100-gram piece by about $1.50.
For more on how melt value translates to a dealer payout, see the scrap silver calculation guide.
Silver has been priced in troy ounces since medieval European precious metals trading, where Troyes, France established the weight standard used across international markets. The troy ounce (31.1035 grams) became the global convention for gold, silver, and platinum and has remained so through to modern commodity exchanges. All major precious metal spot prices, including COMEX and LBMA quotes, are denominated in troy ounces.
Divide the troy ounce price by 31.1035. At $33.00/ozt: $33.00 / 31.1035 = $1.0610 per gram. This gives the price per gram of pure (999) silver. For 925 sterling, multiply the result by 0.925. For 900 coin silver, multiply by 0.900. The Silver Calculator performs this conversion automatically when you select a purity and enter a spot price.
Use the formula: Melt Value = Weight in grams x (Purity / 1000) x (Spot Price / 31.1035). For a 30-gram piece of 925 sterling at $33/ozt: 30 x 0.925 x (33 / 31.1035) = 30 x 0.925 x $1.0610 = $29.44. This is the melt value. Dealers pay 75-90% of this, so a realistic scrap payout for that piece is $22-$26.
A troy ounce is 31.1035 grams. A standard (avoirdupois) ounce is 28.3495 grams. The troy ounce is about 10% heavier. When you weigh silver on a kitchen scale in "oz" mode, you are reading standard ounces. To get troy ounces from a standard ounce reading, multiply by 0.91146. To avoid this confusion entirely, weigh in grams and work with grams throughout.
No. Spot price is quoted for pure (999) silver. If you have 925 sterling silver, the actual value per gram is spot per gram multiplied by 0.925. The spot price itself does not adjust for the alloy content of specific items; you apply the purity factor yourself. This is why the hallmark on a piece is essential for an accurate valuation.
Live silver spot prices are available at Kitco (kitco.com), APMEX (apmex.com), and Bloomberg Markets under the symbol XAG or XAG/USD. Yahoo Finance and Google Finance also show silver prices when you search "silver price" or "XAG/USD." Prices update in real time during trading hours: Sunday 6pm to Friday 5pm Eastern time. The Silver Calculator pulls the current spot price automatically so you can calculate melt value without a separate lookup.
