Coin Metal Weight Calculator
Enter a coin's total weight and its known alloy composition to see how many grams of each metal it contains.
Metal content by weight
A composition breakdown, not a valuation
Mints publish exact alloy specifications for good reason — the metal content of a coin is part of its history and its manufacturing story, from ancient electrum through the 90%-silver coinage of the early-to-mid 20th century to today’s copper-nickel clad issues.
This tool stops at the composition breakdown in grams. It does not estimate melt value, market price, or any dollar figure, and NumisNook does not publish coin valuations or investment guidance of any kind.
Frequently Asked Questions
Where do I find a coin's alloy composition?
Mint specification sheets, standard numismatic references, and Wikipedia's articles on individual coin series typically list the exact alloy percentages by weight for a given date range. Composition often changed mid-series — for example, US dimes and quarters switched from 90% silver to a copper-nickel clad composition in 1965.
Does this tool tell me what my coin is worth?
No. This tool only breaks a known total weight down into its component metals by weight, in grams. It does not calculate melt value, market price, or investment worth, and this site does not publish coin valuations.
Why do the percentages have to add up to 100?
The calculation assumes the entered percentages describe the coin's entire weight. If they don't sum to 100 (allowing a small rounding tolerance), the breakdown wouldn't add up to the coin's actual total weight, so the tool flags it rather than silently returning an inconsistent result.
Why is a clad coin's composition given as one blended percentage instead of separate layers?
Clad coins are actually a sandwich of an outer alloy bonded to a different inner core, but published specifications commonly express this as a single blended percentage across the coin's total weight, which is what this tool expects as input.
Composition/weight estimate only — not a valuation, melt-value, or investment calculation.