Someone hands you a coffee can of old coins, or you inherit a shoebox labeled “quarters 1950s.” The good news about US silver coinage is that it's the easiest thing in numismatics to value: the specifications were set by law and haven't moved since the 1870s. No grading, no rarity charts — just weight, fineness, and today's silver price. This walkthrough is the exact math behind our junk silver value calculator, so you can do it by hand or trust the tool knowing what's inside it.
1. What counts as junk silver
“Junk silver” is dealer shorthand for old US coins worth their silver content and nothing more: dimes, quarters and halves minted in 1964 or earlier(90% silver), the 1965–1970 Kennedy halves (40%), and the 1942–1945 war nickels (35%). The name is unfair to the coins — a pre-1965 quarter is 90% fine silver — but accurate about their market: traded by weight, not by date, unless you happen to find a rare one (more on that later).
Everything else in the can is copper-nickel clad worth face value: 1965-and-newer dimes and quarters, 1971-and-newer halves, Susan B. Anthony and Sacagawea dollars, and every regular nickel except the wartime ones. If you're unsure what you're holding, the identification checklist covers the date, edge and weight tests.
2. The three numbers you need
Valuing junk silver takes exactly three inputs: the statutory weight of each coin, the fineness (0.900, 0.400, or 0.350), and today's silver spot price. The first two are fixed by law — a pre-1965 dime has weighed 2.50 grams since 1873. The third you look up fresh, because it's the only number in the whole calculation that changes. (That's why our calculator makes spot an editable input rather than baking a price into the page.)
Multiply weight by fineness and you get the actual silver weight — ASW, in troy ounces. A troy ounce is 31.1035 grams, not the 28.35-gram ounce on your kitchen scale; every precious-metal price in the world is quoted per troy ounce, so the conversion is non-negotiable.
3. Silver content, coin by coin
Derived straight from the Mint specifications:
| Coin | Weight | Fineness | Silver (troy oz) |
|---|---|---|---|
| Dimes | 2.50 g | 90% | 0.0723 |
| Quarters | 6.25 g | 90% | 0.1808 |
| Halves | 12.50 g | 90% | 0.3617 |
| Dollars | 26.73 g | 90% | 0.7735 |
| 1965–70 Kennedy halves | 11.50 g | 40% | 0.1479 |
| 1942–45 war nickels | 5.00 g | 35% | 0.0563 |
Notice what the table implies: count the coins, multiply by the per-coin figure, and you're one spot-price lookup away from a value. You never need to weigh the pile — the Mint already did, in 1873.
4. The face-value shortcut (0.715 per dollar)
Here's the trick that makes junk silver trade so fast: for dimes, quarters and halves, any mix of 90% coins adds up to the same silver per dollar of face. Unworn, $1 face holds 0.7234 troy ounces. Decades of pocket wear shave about one percent, so the trade quotes circulated coinage at 0.715 ounces per dollar — which is where the classic bag figures come from: a full $1,000-face bag is priced as 715 ounces.
The shortcut works for rolls too. A standard dime roll is $5 face — fifty coins, 3.62 troy ounces unworn, 3.57 worn. A quarter roll and a half roll are each $10 face, or 7.23ounces unworn. So “how much is a roll of silver dimes worth?” has a two-step answer: multiply the roll's ounces by spot, then take off the dealer spread (next section).
5. The exceptions that trip people
Silver dollars don't follow the face rule. A Morgan or Peace dollar contains 0.7735 ounces — about 7% more than the 0.7234 its $1 face implies, because a dollar coin is heavier than two halves. Count them separately; lumped into face-value math, you underprice them every time. A $20 roll of Morgan dollars is 15.47 ounces, not 14.47.
Forty-percent halves are worth barely a third of a pre-1965 half— 0.1479 versus 0.3617 ounces. They're still silver, still worth valuing, just never at 90% prices. And war nickels hide in plain sight: only 1942–45, and only with the large mintmark above Monticello. Most 1942 nickels are ordinary; most people assume all of them are.
Finally, the trap that costs real money: key dates. A 1932-D quarter, a 1916-D Mercury dime, a 1955 doubled-die cent — these carry collector premiums of multiples, not percentages. Sort anything better than worn-common before the pile gets priced by weight.
6. Wear, culls, and what a dealer actually pays
Melt value is the ceiling you'll never quite touch. Dealers buy below spot — the bid — to cover refining and profit; a few percent under melt is typical for 90%, and the spread narrows for larger lots. The worn convention (0.715/$ face) already prices average circulation wear; individual culls — holed, cleaned, bent or badly worn coins — get discounted below it.
Two dealer quotes beat one, and phone quotes beat guesses. When you're ready to compare, the calculator lets you set the bid percentage so the buyback number reflects the offer you actually received.
7. Run your own numbers
The junk silver value calculator implements everything above — coin counts or face value, the worn/unworn switch, and a dealer-bid estimate. If you're deciding between junk silver and new government coins, the junk vs Eagles comparison prices both in ounces per dollar. And once you own any of it, the bullion portfolio calculator keeps the whole stack on one page.