How Much Is Unstripped Copper Wire Worth? Estimate It Before You Sell

You're standing in the garage with a bag of old electrical wire, and you have two options: strip it all by hand tonight, or drop it off at the scrap yard as-is tomorrow morning. The quote from the yard sounds low—maybe $2 or $3 a pound—and you've heard that bare bright copper sells for much more. So you're tempted to pull out a utility knife and start slicing. But is that time worth it? The value of that bag isn't one fixed number. It's the outcome of a formula that involves how much copper is really in the wire, what percentage of the weight is just rubber and plastic, whether the metal is pure copper or a cheaper alloy, and the current price for copper on the scrap market. Most sellers get this wrong because they focus only on the scale: total pounds in, total dollars out. That simplification hides the fact that a pound of heavily insulated cable might contain half a pound of copper, while a pound of solid copper bar contains almost a full pound. Before you decide to strip or sell, you need a way to see what's actually inside your bundle.

Your copper wire has a price—but not the one on the scale.

Before you haul that bag of old electrical wire to the scrap yard, take a moment to ask what it's really worth. You have two options: strip it by hand tonight, or sell it as-is tomorrow morning. The yard's quote sounds low—maybe $2 or $3 a pound—and you've heard bare bright copper fetches much more. So you're tempted to slice through the insulation. But is that time worth it? The value of that bag isn't a single fixed number. It comes from a formula that includes how much copper is actually inside, what share of the weight is rubber and plastic, whether the metal is pure copper or a cheaper alloy, and the current scrap copper price. Most sellers get this wrong because they watch only the scale: total pounds in, total dollars out. That hides the fact that a pound of heavily insulated cable may hold half a pound of copper, while a pound of solid copper bar is nearly all copper. Before you decide to strip or sell, you need a way to see what's actually inside your bundle.

The core equation for unstripped wire is straightforward: value equals the weight of recoverable copper times the current copper price, minus any cost to get that copper out. What makes this tricky is the 'recoverable' part. Copper alloys have a minimum copper content of 99.3%, per McMaster-Carr's material guide, and that near-pure copper makes electrical wire valuable—its excellent conductivity suits it for bus bars and wire connectors. When you have a bundle of old wire, the market price you're paid is essentially for that copper content, not for the plastic jacket. So a wire that is solid copper with thin insulation will command a much better rate per pound than a fat rubber cable that is mostly filler. This is the first mental shift: you're not selling 'wire,' you're selling the copper trapped inside it. That's why an equation beats a fixed price sign.

Copper content, weight, insulation, and the current scrap rate: which one matters most?

Now that you know the value depends on recoverable copper, which variable should you worry about most? Is it the weight of the bundle, the thickness of the insulation, the purity of the copper, or the current scrap quote? Most sellers rank these by instinct, but a mistake in any one can cut your payout in half. Think about what happens at the scale. Two identical-looking bags—one solid copper house wire, one thin alloy strands—get the same mixed quote unless you ask for a separate grade. That's the trap. The weight on the scale includes plastic, rubber, and sometimes steel armor, all of which pay almost nothing. The current copper price is set by global markets, so you can't change that. But you can change what you know about the copper content—that knowledge lets you negotiate a better grade. In the next section, you'll see exactly how to weigh each factor without becoming a metallurgist.

The factor that swings your payout the most is what metallurgists call 'effective copper weight'—the portion of the bundle that is actually pure copper ready for sale. Insulation alone can eat 20-40 percent of the total weight, and if the wire is alloy, what's left isn't pure copper at all. The distinction between brass and bronze is a perfect example. Both are copper alloys, but brass is copper with zinc, and bronze is copper with tin, according to the engineering comparison from Rapid Axis. Bronze contains tin, which is far more expensive than zinc, so a bronze wire carries more intrinsic value than a brass wire of the same weight. That's why a careful scrap buyer will sort your wire by color and spark test before quoting a price: a yellow tint signals brass, while a reddish tint suggests higher copper content. The lesson is that you cannot estimate value from weight alone; you have to know both the jacket's share and the alloy underneath it. Once you account for these two deductions—insulation and alloy—you have a realistic number to multiply by today's copper rate.

Strip it yourself or sell it as mixed scrap?

With your effective copper weight in mind, the decision becomes a straight comparison of two paths. Path one: sell the wire as mixed scrap, take the low per-pound quote, and walk out with cash in ten minutes. Path two: spend an hour or two stripping the insulation, sort the bare copper into a clean grade, and hope the higher per-pound payout covers your time. Which one wins? That depends on how quickly you can strip, how thick the jackets are, and what an hour of your time is worth to you. It also depends on whether the wire is solid copper or an alloy—stripping a brass wire that will still be priced as yellow scrap may be pure wasted effort. Most people default to stripping because they imagine the per-pound price doubling. But the math only works if the stripped copper is actually pure and the time you spend is nearly free. A better approach is to run a quick break-even calculation before you touch a single cutter.

The comparison between stripping and selling mixed gets clearer when you look at alloy costs. In CNC machining, bronze parts can cost four times as much as similar brass pieces, as WeFab's material guide points out, because bronze contains tin—a metal far pricier than zinc—and because bronze's hardness makes it slower to cut. The same logic applies to scrap wire: if the conductor is bronze, its intrinsic metal value is higher than brass, but the harder alloy will dull your stripping blades and take longer to process. If you have a bag of thin brass strands, the effort of stripping yields little because the base material sells at a low yellow-scrap rate; you might as well sell it mixed. If you have heavy bronze cable, the higher per-pound value might justify an evening of work. The alloy, not the color, sets the ceiling on what your time can earn. If you're uncertain whether the metal is brass or bronze, a quick scratch test or a magnet check can help, but the price spread between them is real and worth the extra minute.

The strip-versus-sell call eventually comes down to your hourly rate. The Rapid Axis comparison notes that brass is softer and easier to machine than bronze, which is why brass components are common in high-precision hardware. In wire form, that means brass jackets are usually easy to strip, but the payoff per pound is nothing special. Bronze, by contrast, is built for high-wear applications like bushings and bearings; that toughness makes it a pain to strip by hand, but the tin content gives it a meaningful scrap premium. So set a simple threshold: calculate how much extra cash stripping produces per hour, and compare that to what you honestly earn per hour. If you can make $20 an hour at your job, spending two hours to gain $12 in extra scrap value is a losing move. If the extra value is $50, grab the stripper. That simple math keeps your evenings honest. And if you're lucky enough to have high-value bronze cable, the equation shifts quickly in your favor.

A three-step estimate before you haul the bag away

So how do you actually calculate that threshold without a spreadsheet? You need three numbers: the weight of the wire, the price per pound for mixed scrap versus clean copper at your local yard, and the percentage of the weight that is copper rather than insulation. With those three numbers, the decision becomes arithmetic. Most scrap yards publish their current rates online or on a sign, so you can get the mixed and bare bright copper quotes in minutes. The weight comes from a bathroom scale or a luggage scale. The missing piece is the copper fraction, and that depends on the kind of wire. Solid copper house wire with thin insulation is mostly copper, while thick rubber cables with steel armor can be mostly filler. The exact split depends on the cable's construction. You can estimate the fraction by cutting a short sample, stripping it, and weighing the copper separately—a two-minute test that turns guessing into data. Once you have that number, you can plug it into a break-even formula and know instantly whether stripping this particular batch is worth your evening.

The reliable workflow is a three-step estimate. Step one: identify the material. The National Bureau of Standards' Letter Circular 1028 has, since 1957, defined brass as a copper-zinc alloy and bronze as a copper-tin alloy, and that formal distinction is still the basis for scrap grading. Check the wire's markings if they exist—grades like C36000 for brass or C93200 for bronze tell you exactly what you're holding. If there are no markings, use color: a yellow tint points to brass, a reddish tint to higher copper content, and a magnet can reveal steel reinforcement that adds weight but zero value. Step two: weigh the whole bundle, then strip a small sample to estimate the recoverable copper percentage. Step three: multiply that copper weight by the current bare-bright scrap price, subtract the mixed-scrap value you'd get without stripping, and divide by the stripping time to get your effective hourly rate. For example, a 10-pound bundle that produces 5 pounds of bare copper, sold at $3.50 per pound instead of $1.50 per pound mixed, earns an extra $10. Spread over two hours of stripping, that's a $5 hourly rate—a clear pass for most people.

The one rule that keeps your hourly rate honest

Now bring in the market numbers that make the rule concrete. As of January 2026, three-month London Metal Exchange prices put copper around $13.34 per kilogram, tin at $53.46 per kilogram, and zinc at a modest $3.31 per kilogram, according to Baosheng Industry's 2026 alloy guide. Because bronze carries tin, it commands a 40-60 percent premium over brass, and pure copper sits above both. That spread is exactly why you cannot eyeball a per-pound 'scrap rate' without knowing what metal you hold. The final rule is simple: strip a wire only if the extra cash you get from selling it as bare copper, divided by the hours you spend stripping, meets or beats your own hourly time value. For a 10-pound bundle of heavy copper cable, that might be a clear yes. For a pile of thin, alloy-heavy strands, it's a clear no. Let the arithmetic, not your ambition, make the call. Run the numbers once, and you'll never wonder again.

When the choice still feels tangled, come back to this: the value of unstripped wire is never a number on a sign—it's a product of copper content, effective weight, and your own time. Run the three-step estimate once, and the right move becomes obvious. If stripping pays you more per hour than your other options, do it. If it doesn't, take the mixed-scrap quote and move on. That's not a compromise; it's the same decision rule a professional scrap buyer uses, and now you have it too. The bag in your garage is worth what the copper inside is worth, and now you know exactly how to find that number. The rule cuts through the anxiety: you're not making a once-in-a-lifetime choice, you're pricing your time. When the hourly rate from stripping doesn't clear your threshold, selling mixed isn't a loss—it's a smart buy of your own free hours. Keep a simple note in your phone with your threshold and today's scrap prices, and the next bag will take five minutes to decide.

Let the arithmetic decide. Weigh the bundle, check the alloy, price the copper, and strip only when the per-hour gain beats your own number.