Copper or Zinc Penny? How to Tell (Especially 1982)

Check the date first: Lincoln cents dated 1981 or earlier are copper (except the 1943 steel cent), and cents dated 1983 or later are copper-plated zinc. Pennies dated 1982 were made both ways, so put them on a scale. A copper cent weighs 3.11 grams and a zinc cent weighs 2.50 grams, a gap any digital scale that reads to 0.1 g can catch.

That's the whole method in two sentences. The rest of this guide covers how to do it quickly with a big pile, what to do without a good scale, and the mistakes that trip people up.

Start by sorting on the date

The date settles the question for almost every cent you'll pick up. Here's the rule, based on official mint specifications:

Make three piles as you go: "copper by date," "zinc by date" and "1982, weigh me." Pull anything older than 1959 into a fourth tray, since wheat cents and Indian Heads deserve a closer look for collector value. The 1943 cent will look gray or silvery, not copper-colored.

Here's the live comparison of the two modern cents, with their specs and current melt values side by side.

Then weigh every 1982 cent

In 1982 the Mint switched to copper-plated zinc partway through the year, so that date comes in both alloys. You can't tell them apart by color, because both have a copper surface. Weight is the reliable test.

• 3.11 g: 95% copper. Keep it with your copper pile.
• 2.50 g: copper-plated zinc. Treat it like any later cent.

Worn coins lose a little weight, but nowhere near the 0.61 g difference, so a reading around 3.0 to 3.1 g still means copper and anything near 2.5 g means zinc.

You'll also see 1982 cents with different date styles, often called small date and large date. The date style alone doesn't tell you the metal, so don't skip the scale. Our dedicated guide to the 1982 penny, copper or zinc goes deeper on that year.

Worked example with the stack trick

If your kitchen scale only reads whole grams, weigh ten 1982 cents at once. Ten copper cents weigh 31.1 g. Ten zinc cents weigh 25.0 g. Each copper cent in the stack adds about 0.61 g.

Say Marcus weighs a stack of ten and gets 27.4 g. That's 2.4 g over the all-zinc weight. Divide 2.4 by 0.61 and you get about 4, so roughly four copper cents are hiding in the stack. Split it into two stacks of five and repeat until you've found them. It's slower than a 0.01 g scale but works with what's in most kitchens.

No scale? Try the sound test

Copper and zinc ring differently. Balance a cent on your fingertip and tap it with another coin, or drop it a few inches onto a hard table. A copper cent gives a brighter, ringing note. A zinc cent sounds dull, more of a thud.

The sound test takes practice. Drop a known 1975 cent and a known 1995 cent side by side a few times to train your ear, then test the 1982s. It's handy for a quick sort, but confirm anything you plan to keep or sell with a scale.

Other clues that point to zinc

• Gray patches or bubbling: when the thin copper plating wears or gets damaged, the zinc core shows through and can corrode. Copper cents darken evenly instead.
• Feel in a handful: a hundred zinc cents weigh 250 g against 311 g for copper. You may notice the difference in a full roll.
• Roll weight: a wrapped 50-coin roll weighs about 155.5 g of copper cents or 125 g of zinc cents, plus the wrapper.

Neither copper nor zinc sticks to a magnet, so the magnet test only helps with 1943 steel cents. For a deeper look at alloys across the years, see what pennies are made of.

Copper and zinc cents side by side

If you like everything in one place, this is the reference to keep next to your sorting trays.

The weight row is the one that matters most. Every other clue can fool you on a single coin, but weight doesn't lie unless the coin is badly damaged.

Sorting a whole box

For a $25 box of 2,500 cents, don't weigh coins one by one. Go through by date with good light and a magnifier, and only weigh the 1982s. Bag the copper cents in $5 lots of 500 and check each bag by weight: 500 copper cents should weigh about 1,555 g, or roughly 3.4 pounds. A bag that comes in light has zinc cents mixed in.

Common mistakes when sorting copper from zinc

1. Judging by color. A shiny new zinc cent can look more "copper" than a dark 1970 copper cent.
2. Filing, cutting or using acid. Scratching a coin to see the core ruins any collector value and isn't needed when a scale costs less than a few rolls of cents.
3. Using a scale without checking it. Weigh a known copper cent first. If it doesn't read close to 3.11 g, recalibrate.
4. Tossing 1982s in the zinc pile. A share of them are copper. Weigh every one.
5. Ignoring old cents. Wheat cents and Indian Heads are copper too, but some are worth more to collectors than for their metal.

Why the difference matters

Metal is the reason people sort. A 95% copper cent holds about $0.0424 worth of copper at today's price, while a zinc cent holds about $0.0107. The card below shows the zinc cent's live numbers so you can compare.

Keep in mind that federal rules bar melting 1-cent coins for their metal, so the copper value is something you can track, not something you can cash in at a scrap yard. Our pillar guide on whether copper pennies are worth saving lays out those trade-offs, and the copper penny page tracks the live melt value.

Your quick sorting checklist

• Set up four trays: copper by date, zinc by date, 1982 to weigh, and pre-1959 for review.
• Weigh a known copper cent to check your scale reads about 3.11 g.
• Weigh every 1982 cent singly, or in stacks of ten on a cruder scale.
• Use the sound test only as a first pass.
• Count your copper cents by weight: a pound holds about 146. Our guide on how many pennies are in a pound has the math.
• If you're sorting boxes regularly, read up on sorting machines and methods before buying gear.