How to Calculate Scrap Gold Value in 2026

You're standing at a pawn shop counter. The seller wants $180 for a 14K gold chain. It looks heavy — maybe 20 grams. Is that a good deal, or are you about to leave money on the table? If you can't answer that question in under ten seconds, you're not ready to buy scrap gold.

Calculating scrap gold value is the single most important skill for anyone buying gold — whether you're a weekend picker, a full-time scrap buyer, or a stacker building long-term holdings. Get it right and you make money on every deal. Get it wrong and you're the one someone else is profiting from.

This guide breaks down exactly how to calculate scrap gold value in 2026, what numbers you need, and how to use them in the field.

What Is Scrap Gold Value?

Scrap gold value — also called gold melt value — is what the raw gold content in a piece of jewelry or scrap is worth based on today's market price. It strips away brand names, craftsmanship, and retail markup. You're pricing the metal and nothing else.

This is the number that matters when you're buying scrap. It tells you the ceiling — the absolute maximum that piece is worth if you melted it down and sold the pure gold. Your buy price needs to be below this number, or you're losing money.

The Three Numbers You Need

Every scrap gold calculation comes down to three inputs. Miss one and your number is wrong.

1. Weight

Weigh the piece in grams using a digital scale accurate to at least 0.1 grams. Pocket jewelry scales work, but make sure yours is calibrated. A $20 scale that's off by half a gram will cost you hundreds over time.

If the piece has stones, clasps, or non-gold components, you'll need to estimate or remove them. Stones don't have melt value, and a heavy clasp on a light chain can throw your numbers off.

Convert grams to troy ounces by dividing by 31.1035. Gold is always priced per troy ounce — not the regular (avoirdupois) ounces you see on a kitchen scale. This trips up beginners constantly. A troy ounce is about 10% heavier than a regular ounce.

2. Karat (Purity)

Karat tells you what percentage of the piece is actually gold. Pure gold is 24K. Everything below that is an alloy — gold mixed with other metals for durability.

Here's the karat-to-purity breakdown you'll use daily:

• 10K = 41.67% gold — the minimum legal karat to be called "gold" in the United States
• 14K = 58.33% gold — the most common karat in American jewelry
• 18K = 75.00% gold — higher-end jewelry, more common in Europe
• 22K = 91.67% gold — Indian jewelry and some bullion coins like American Gold Eagles
• 24K = 99.90% gold — pure bullion bars and coins like Canadian Maples and Gold Buffalos

Most scrap you'll encounter is 10K or 14K. That's where the volume is. Learn to eyeball hallmark stamps — they're usually on clasps, inside ring bands, or on the back of pendants. Common stamps: 417 (10K), 585 (14K), 750 (18K).

If you have access to an XRF analyzer, you can get an exact purity reading down to the decimal. XRF guns are expensive, but if you're buying volume, they pay for themselves fast by catching pieces that are stamped one karat but test at another.

3. Spot Price

The spot price is the current market price for one troy ounce of pure gold. It changes throughout the trading day based on global supply and demand. You need today's spot price — not yesterday's, not last week's.

In 2026, gold spot has been trading at historically elevated levels. That makes accurate calculation even more important because the dollar difference between a good deal and a bad one is wider than it used to be.

Check spot price from a reliable source before you head out to buy. Your calculation is only as good as the spot price you're using.

The Melt Value Formula

Here's the formula:

Melt Value = Weight (in troy ounces) × Purity (as a decimal) × Spot Price

Let's run the pawn shop example from the opening. That 14K chain weighing 20 grams:

1. Convert weight: 20 grams ÷ 31.1035 = 0.6430 troy ounces
2. Purity: 14K = 0.5833
3. Spot price: let's say gold is at $2,400/oz today
4. Melt value: 0.6430 × 0.5833 × $2,400 = $900.19

The melt value of that chain is about $900. The seller wants $180. That's a buy rate of 20% — meaning you'd be paying 20 cents on the dollar for the gold content. That's a strong deal for most scrap buyers.

What's a Good Buy Rate?

Buy rate is the percentage of melt value you pay. It's how you control your margin.

Most scrap gold buyers operate between 70% and 85% of melt value when buying from the public. Below 70% means you're getting exceptional deals — those happen, but they're not the norm. Above 85% and your margins get tight, especially after refinery fees.

If you're selling to a refinery, they typically pay 95–98% of melt value. So your profit is the spread between what you paid and what the refinery pays.

Example: You buy that 14K chain for $180 (20% of melt). You send it to a refinery that pays 97% of melt. You receive $873.18. Your profit before shipping and fees is $693.18. That's why knowing your melt value matters — it's the number that tells you whether there's money in the deal.

Common Mistakes That Cost Money

Confusing Grams and Troy Ounces

Regular ounces and troy ounces are different. A regular ounce is 28.35 grams. A troy ounce is 31.1035 grams. If you use the wrong conversion, your melt value calculation will be off by about 10%. On a $900 piece, that's a $90 error.

Trusting Stamps Without Testing

Not every piece stamped 14K is actually 14K. Some jewelry is mis-stamped, some is counterfeit, and some has been soldered with lower-karat material. If you're buying volume, invest in a testing method — acid test kits are cheap, electronic testers are faster, and XRF analyzers are the gold standard for accuracy.

Using Stale Spot Prices

Gold can move $30–50 in a single trading day. If you calculated melt value this morning and you're buying this afternoon, check the price again. A scrap gold calculator that pulls live spot prices eliminates this problem entirely — tools like Nu Stack's Calculator let you plug in weight and karat and see melt value instantly based on the current spot price.

Forgetting to Account for Non-Gold Weight

That heavy gold necklace might have a steel clasp, a silver-plated lobster claw, or a gemstone pendant. Weigh the gold components separately when possible. If you can't separate them, discount the total weight by your best estimate. Being conservative here protects your margin.

Running Numbers in the Field

Speed matters when you're out buying. You don't want to fumble with a calculator app while a seller is standing in front of you. Here's how to get fast:

Memorize the purity decimals for 10K (0.4167), 14K (0.5833), and 18K (0.7500). Those three cover 90% of what you'll see.

Know your buy rate before you walk in. If you buy at 80%, you already know you're paying 80 cents per dollar of melt value. You just need to calculate melt value and multiply by 0.80 to get your offer.

Practice the calculation until you can do a rough estimate in your head. Weight in grams, divided by 31.1, times purity, times spot. Round numbers are fine for a quick gut check — you can run the exact number on your phone before you commit.

Mixed-Karat Lots

When you're buying a mixed lot — say a bag of jewelry with 10K, 14K, and 18K pieces — you need to sort and weigh each karat separately. Don't average the karats. A lot that's half 10K and half 18K is not the same as a lot that's all 14K.

Sort the lot, weigh each karat group, calculate melt value for each group, then add them up. This is where having a calculator that supports multi-karat entry saves serious time. Enter each karat and weight, and the total melt value rolls up automatically.

What About Silver?

The same formula applies to silver, but silver has grades instead of karats:

• .800 silver = 80% pure (European silver, older coins)
• .900 coin silver = 90% pure (pre-1965 US dimes, quarters, halves)
• .925 sterling = 92.5% pure (jewelry, flatware)
• .999 fine = 99.9% pure (bullion bars, American Silver Eagles)

Silver's spot price is much lower than gold, so the dollar amounts are smaller, but the math is identical. Weight × purity × spot price = melt value.

Start Calculating Before You Start Buying

Every experienced scrap gold buyer will tell you the same thing: know your melt value before you make an offer. It's the one number that separates profitable buyers from everyone else. Learn the formula, practice it until it's automatic, and never walk into a deal without running your numbers first.

If you're looking for a faster way to run the math, try the free calculator at nustack.app — enter weight, select karat, and get your melt value in seconds.