Scrap Gold Filled Calculator

What is a Scrap Gold Filled Calculator?

A scrap gold filled calculator is a specialized financial tool used by jewelers, hobbyists, and precious metal investors to determine the intrinsic value of items marked as “gold filled.” Unlike solid gold jewelry, gold-filled items consist of a base metal core (usually brass or copper) mechanically bonded with a thick layer of gold. Because the gold content is a specific fraction of the total weight, calculating the value requires more than just checking the spot price.

Our tool simplifies this process by analyzing the marking (such as 1/20 14K), converting weight across different units (grams, ounces, pennyweights), and applying current market data to provide an accurate estimate of what a refinery or scrap buyer might pay you.

The Scrap Gold Filled Calculation Formula

To calculate the value of scrap gold filled items, we use a multi-step formula that accounts for the ratio of gold, the purity of that gold layer, and the current market conditions.

Table 1: Key variables used in the scrap gold filled calculator.

Variable	Meaning	Typical Range
Total Weight	The gross weight of the scrap item	1g – 10,000g
GF Ratio	The fraction of the item that is the gold layer (e.g., 1/20)	5% to 10%
Karat Purity	The fineness of the gold layer (e.g., 14K = 58.3%)	10K to 14K
Spot Price	The current market price of pure 24K gold	Market Dependent
Payout %	The percentage a buyer keeps for processing/profit	60% – 90%

The Math:
Pure Gold Content = Total Weight × GF Ratio × (Karat / 24)
Value = Pure Gold Content × (Spot Price / 31.1035) × Payout %

Practical Examples

Example 1: A 1/20 14K Gold Filled Chain

Suppose you have a chain weighing 50 grams marked as 1/20 14K GF. The spot price is $2,000/oz.

• Gold Layer Weight: 50g × 1/20 = 2.5g of 14K gold.
• Pure Gold Content: 2.5g × (14/24) = 1.458g of pure 24K gold.
• Market Value: 1.458g × ($2,000 / 31.1035) = $93.75.
• Refinery Payout (80%): $75.00.

Example 2: 1/10 10K Vintage Watch Case

A vintage watch case weighs 20 grams and is marked 1/10 10K. Spot price is $2,000/oz.

• Gold Layer Weight: 20g × 1/10 = 2.0g of 10K gold.
• Pure Gold Content: 2.0g × (10/24) = 0.833g of pure gold.
• Market Value: 0.833g × ($2,000 / 31.1035) = $53.56.

How to Use This Scrap Gold Filled Calculator

Follow these steps to get a professional valuation of your scrap:

1. Weigh your items: Use a digital scale to find the weight in grams or pennyweights. Ensure the items are clean.
2. Identify the marking: Look for stamps like “1/20 14K GF” or “1/10 12K GF”. This tells you the ratio and purity.
3. Enter Market Price: Check the current gold spot price and enter it into the “Spot Price” field.
4. Adjust Payout: If selling to a local pawn shop, they may pay 60-70%. Refineries often pay 85-90%.
5. Review Results: The calculator will show you the pure gold content and the expected cash in hand.

Key Factors That Affect Scrap Gold Filled Value

• Gold Spot Price: The most volatile factor; prices change every minute during market hours.
• Item Wear and Tear: Significant rubbing or “brassing” means some of the gold layer has worn away, reducing value.
• Refinery Fees: Buyers must melt and chemically separate the gold from the brass, which is labor-intensive.
• Weight Accuracy: Scales must be calibrated. Even a 1-gram difference can impact the price of large batches.
• Marking Authenticity: Occasionally, items marked GF are counterfeit or “rolled gold plate” (RGP), which has less gold.
• Inclusions: Stones, springs, and glass watch crystals must be removed or accounted for as “tare weight.”

Frequently Asked Questions

Is gold filled the same as gold plated?

No. Gold filled contains significantly more gold. It is legally required to be at least 1/20th gold by weight. Plating is a microscopic layer that usually cannot be profitably recovered as scrap.

What does 1/20 14K mean?

It means that 1/20th (5%) of the total weight of the item is 14-karat gold. The remaining 95% is a base metal alloy.

How do I convert pennyweights to grams?

One pennyweight (dwt) is equal to approximately 1.555 grams. Our calculator handles this conversion automatically when you select the units.

Can I scrap RGP (Rolled Gold Plate)?

RGP usually has a ratio of 1/40 or less. While it can be scrapped, many buyers require very large quantities to make the refining process worthwhile.

Do I get paid for the brass core?

Generally, no. The cost to refine and separate the base metals usually exceeds their market value in small quantities.

Why is my payout lower than the “Market Value”?

Buyers need to cover their overhead, shipping to refineries, and the cost of the actual chemical refining process. A typical “fair” payout for gold filled is between 70% and 85%.

Is the calculator updated for 2026 prices?

The calculator uses whatever spot price you input. You should check a live ticker for the most current price per ounce.

Are dental gold and gold filled the same?

No, dental gold is usually a high-karat solid alloy (16K-22K) and is not “filled.” You should use a solid gold calculator for dental scrap.