How to Value Coins
Most old coins are worth a little more than face value, and a few are worth a great deal. This guide walks through the same steps a careful dealer uses to tell the two apart, from identifying the coin to deciding whether professional grading is worth the fee.
Last reviewed 2026-10-16 by the ValU team.
Start with exact identification
Before you can price a coin you need to know exactly what it is. That means the issuing country, the denomination, the design type, the year and, for many coins, the mint that struck it. Two coins with the same date can differ in value by a factor of a hundred simply because one came from a mint that produced far fewer pieces that year.
On United States coins the mint mark is a small letter, usually near the date or on the reverse. Common marks include P for Philadelphia, D for Denver, S for San Francisco, O for New Orleans, CC for Carson City and W for West Point. Many older Philadelphia coins carry no mint mark at all, so the absence of a letter is itself information. Use a 5x to 10x loupe and good, angled light; mint marks are easy to misread on worn coins.
Write down everything you can see: date, mint mark, design details and any lettering on the edge. Then look the coin up in a standard reference such as the Guide Book of United States Coins (often called the Red Book) or the online catalogues maintained by the major grading services. Those references tell you the mintage, the known varieties and which dates are considered scarce.
Understand the two floors under every coin: face value and metal value
Every coin has two minimum values. The first is face value, which only matters for coins that are still legal tender and commonly spent. The second is the value of the metal it contains, often called melt value. For modern base-metal coins melt value is small, but for older silver and gold coins it is frequently the largest part of the price.
For example, United States dimes, quarters and half dollars dated 1964 and earlier were struck in 90 percent silver. Kennedy half dollars from 1965 to 1970 contain 40 percent silver. Nickels from 1942 to 1945 with a large mint mark above Monticello contain 35 percent silver. These coins trade close to their silver content when they are worn and common, and above it when they are scarce or in high grade.
To estimate melt value, multiply the coin's actual precious metal weight by the current spot price. The actual silver weight for each type is published in standard references. Remember that dealers buy below spot and sell above it, so the price you are offered for common bullion-type coins will usually be a little under the calculated melt figure.
Grading: the biggest single driver of value
Coin grades in the United States use the Sheldon scale, which runs from 1 to 70. A coin graded 1 (Poor) is barely identifiable. Grades from about 4 to 58 describe circulated coins, with labels such as Good, Very Good, Fine, Very Fine, Extremely Fine and About Uncirculated. Grades from 60 to 70 describe Mint State coins that show no wear from circulation; within that range, the number reflects marks, luster and eye appeal. Proof coins, which are specially struck for collectors, are graded on the same numbers with a PR or PF prefix.
The difference of a single point can matter enormously for scarce coins in high grades, because so few examples survive in that condition. For common circulated coins the difference between Fine and Very Fine may be only a dollar or two. That is why grading is worth learning, but also why you should be cautious about grading your own coins optimistically. Most beginners overgrade.
Look at the high points of the design first, since those wear before anything else: the hair above the ear, the cheek, the eagle's breast feathers, or the folds of a gown. Luster, the cartwheel shine that moves as you tilt a coin under light, is a strong clue that a coin has not circulated.
Never clean a coin
Cleaning is the most common way people destroy value. Polishing, dipping or scrubbing removes the original surface and leaves fine hairline scratches or an unnatural brightness that experienced buyers spot immediately. The major grading services generally will not assign a numeric grade to a coin they judge to be cleaned; they label it with a details grade instead, and such coins sell at a significant discount to problem-free examples.
If a coin is dirty, leave it as it is. Toning, the natural color that develops over decades, is not damage, and attractive toning can even add value. Handle coins by the edges, ideally over a soft surface, and store them in inert holders rather than old PVC flips, which can leave a green residue over time.
Key dates, varieties and errors
Within most series a handful of dates are scarce because of low mintage or low survival. Collectors call these key dates, and they carry most of the value in a series. Varieties are distinct versions of the same date, such as doubled dies, repunched mint marks or different design details. Errors are coins that were struck incorrectly: off-center strikes, wrong planchets, clipped planchets and similar mistakes.
Genuine errors and recognized varieties can be valuable, but many claimed errors are actually post-mint damage. A coin that has been hit, squeezed or plated after leaving the mint is not an error and is usually worth little. Before you assume you have a rare error, compare it carefully with documented examples in a variety reference and be skeptical of anything that seems too dramatic.
When professional grading makes sense
Third-party grading services such as PCGS and NGC authenticate a coin, assign a grade and seal it in a tamper-evident holder with a certification number. For valuable coins this matters, because buyers pay more for a coin whose authenticity and grade have been independently confirmed. You can look up any certification number on the service's website to confirm that the holder and coin match its records.
Grading costs money and takes time, so it only makes sense when the expected value of the coin comfortably exceeds the fee and shipping. A common circulated coin is rarely worth submitting. A key date, a potential high-grade Mint State coin, or a coin you suspect may be counterfeit often is. Some collectors also look for an additional verification sticker from CAC, which indicates that a graded coin is considered solid for its grade.
How to find a realistic price
Price guides give a useful starting point, but the best evidence is what comparable coins have actually sold for recently. Auction archives from major numismatic auction houses and completed listings on large marketplaces show real hammer prices. Match the date, mint mark, variety and grade as closely as possible, and pay attention to whether the comparable coin was graded by a third party, since graded and raw coins trade differently.
When you use ValU on a coin, photograph both sides straight on with even light and include a close-up of the date and mint mark. The estimate you get is a range based on the identification and recent sales of similar coins; for anything that looks scarce, treat it as a reason to research further or to get an expert opinion, not as a final appraisal.
A quick checklist
- Identify country, denomination, type, date and mint mark.
- Check whether it contains silver or gold and estimate melt value.
- Look up mintage and whether the date is a key date or known variety.
- Grade it conservatively by checking the high points and luster.
- Do not clean it, and store it in an inert holder.
- Compare against recent sold results for the same grade.
- Consider PCGS or NGC grading if the coin may be valuable or questionable.