925 Silver Price Per Gram: Weight and Purity Calculation

Calculate silver value per gram for 999, 925, 900, 835 and 800 grades using a price you supply. Correct conversion tables and mixed-lot examples.

Silver value per gram depends on two inputs: a price per fine troy ounce and the silver fraction of the material you weighed. For sterling, multiply the per-gram fine-silver price by 0.925. The result is a metal-content estimate for one gram of sterling alloy, not a guaranteed buyer offer.

The Silver Calculator accepts a price you enter manually in USD per fine troy ounce. Its prefilled $30 is a labeled example. All prices below are hypothetical comparison inputs, not today's quotes.

The Per-Gram Formula#

Value per gram of alloy = Price per fine troy ounce / 31.1034768 × Purity
Total melt value = Alloy grams × Value per gram of alloy

Use a fraction such as 0.925, not 925 or 92.5, in the calculator's purity field. Apply it once. If an assay already reports fine silver grams, skip the purity step because the alloy adjustment has already been made.

NIST's mass conversion table gives the troy-ounce conversion. A troy ounce is 31.1034768 grams; an ordinary ounce is 28.349523125 grams. Use the unit shown on the scale, rather than treating every “oz” label as troy.

Hypothetical Per-Gram Reference Table#

Each cell is USD per gram of the stated alloy. Values are calculated at full precision and displayed to four decimal places.

For example, at an entered $33 price, one gram of sterling has $0.9814 of melt value. A 50-gram sterling bracelet has $49.07, calculated before rounding. Multiplying a rounded per-gram display can change the last cent on a heavier lot.

Compare 925, 835 and 800 by Verified Weight#

The numeric grade means parts of silver per thousand parts of alloy: 925 is 92.5%, 835 is 83.5%, and 800 is 80%. The FTC identifies sterling silver as 92.5% silver. A country's name, an item's age, or tarnish color does not establish its exact purity. Have unfamiliar or unclear marks assessed before using them as calculation inputs.

At the same price and weight, 800 alloy has 800 / 925 = 86.49% of the fine silver in sterling. That is about 13.51% less metal content. Conversely, sterling contains 15.625% more silver than 800 alloy of the same weight; the different percentages use different comparison bases.

At the hypothetical $33 price:

Do not round 833 to 835 simply because the marks look similar. Use the verified fraction for the particular item. Likewise, entering “German silver” as 0.835 would be unsafe: a descriptive name is not an assay or a fineness mark.

Weigh Only the Relevant Material#

For solid sterling flatware, the alloy weight includes the non-silver metal mixed into sterling; the purity factor accounts for that metal. It should not also include a steel blade, cement inside a weighted handle, stones, or other separate components.

For a mixed lot, calculate each verified grade separately. As an illustration, 50 grams of sterling plus 100 grams of .800 alloy contains 46.25 + 80 = 126.25 grams of fine silver. At $33 per fine troy ounce the combined melt value is $133.95. Assigning the whole lot a 0.925 purity would overstate it.

Plated items require different information: the gross weight does not reveal the silver layer's weight. See the silver plate guide before entering plated pieces as if they were solid alloy.

Compare a Cash Offer Using the Same Basis#

A buyer can quote per gram of gross alloy, per gram of fine silver, or a total amount for the lot. These are different units. Ask which one the quote uses, whether fees are included, and when the price expires.

Enter a net total offer in the calculator to compare it with melt value. For example, $80 against $100 of calculated melt is 80%; that arithmetic does not establish a “normal” dealer payout. Buyer terms, resale demand and collectible value vary. The refinery quote guide explains fee and assay comparisons.