How to Calculate Gold Scrap Price Per Gram Without a Calculator

Updated on July 4, 2018
Chris Telden profile image

Chris Telden enjoys teaching others how to apply simple mathematical operations in real-life situations. Math is power!

How precious is gold? Well, people have been recycling it in all the millennia they've been using it - which should give you your answer. If you're going through your old knicknacks with the idea of selling the gold pieces to someone - like refiners, or maybe pawn shops - then you'll want to get a ballpark figure of their value so you're not ripped off.

Here you will learn how to use simple math to calculate the price per gram of gold scrap. Your tools are minimal - a calculator, a gram scale, and of course you need to know the karat weight (10K, 14K, 18K, or 24) of the gold items, which may require a magnifying glass. So dig up your supplies and let's get started.

Three important notes before we start:

  1. You'll only be estimating how much cash you should be offered. Remember that most dealers make their profits by offering a fixed percentage less than the current market value.
  2. The value of gold, which is traded in all time zones 24 hours a day, changes constantly, with its price set in London twice daily. This means if you decide to sell the gold one day and actually conduct the transaction on another day, its value will have changed.
  3. This method won't work for gold-plated items.

Calculating Gold Price is Easy if You Know a Few Facts.
Calculating Gold Price is Easy if You Know a Few Facts. | Source

Step 1 - Find the Current Price of Gold

The first step is simply to write down the dollar amount of the current price of gold. This can be found online. Websites such as Goldprice.org, Kitco.com, and Monex.com track the metal markets, and so do some unexpected sites. For example, when I was selling my handcrafted jewelry, I would check gold and silver markets right at the store from which I bought my precious metals.

So if today the price of gold happens to be $1,000 per troy ounce, then write down $1,000. (On the date of this March 2015 revision, the number is higher - over $1,300. But we'll use $1,000 because it's an easy round number.)

Step 2 - Find the Price of Gold Per Gram

Divide $1,000 by 31 grams. (Remember, that $1,000 figure is in this example only - when you do it, use the real gold price). The result is the price of gold per gram - in this example, approximately $32.26.

Why 31 grams? The price of gold is conventionally measured in troy ounces. One troy ounce is 31.10348 grams. Here, to make things easy, I rounded this number to 31 grams. If you are not too math-challenged, then feel free to use all the decimal places.

Step 3 - Sort Your Scrap into Piles of Fineness

Now you're ready to sort your gold into piles by its purity - that is, by how much actual precious metal versus base metal is in the scrap. You will calculate the value of each pile separately.

Use a magnifying glass if necessary to determine the fineness of the gold, then sort it into piles by fineness (10K, 14K, 18K, or 24K, where K means karat.)

Note: Gold plated scrap cannot be weighed this way and should be excluded from this calculation.

Figure Out How Much Your Scrap Gold is Worth Using Price of Gold Per Gram.
Figure Out How Much Your Scrap Gold is Worth Using Price of Gold Per Gram. | Source

Step 4 - Weigh the Scrap Gold

Weigh each pile using a gram scale. Write down how much it weighs in grams.

Alternatively, you can use an accurate scale that uses standard avoirdupois ounces or troy ounces as a unit and then manually convert to grams. If you do this, then note that for every avoirdupois ounce of scrap gold you have, you have approximately 28.35 grams of gold. (So if you had 3.2 ounces of gold, you'd have 3.2 times 28.35 or 90.72 grams. If your scale measures in troy ounces, you'd have 3.2 times 31.10348, which would be 99.53 grams. This example is just for use in explaining this step - don't use it in the calculations below.)

Step 5 - Calculate the Gold Price According to the Amount of Pure Gold in the Alloy

Do the simple calculation below for each pile. Multiply as described using the number from Step 2 (the price of gold per gram):

Chart: Operation to Perform - By Karat Weight

For your
 
10 karat (10K) gold...
multiply the price by .4167.
14 karat (14K) gold...
multiply the price of gold per gram by .5833.
18 karat (18k) gold...
multiply the price of gold per gram by .75.
24 karat (24k) gold...
multiply the price of gold per gram by 1 (which will yield the same result you began with).
gold of another karat weight...
multiply the price of gold per gram by the karat weight divided by 24.

The result you end up with is the scrap gold price per gram of that karat weight of gold.

Step 6 - Calculate the Current Market Price of Gold Scrap

Now the final step: Multiply the number you figured from Step 5 times the weight of gold in grams from Step 4.

Example: If you had 50 grams of 10 karat gold, and if the gold price per gram of 10K gold was $12, then you would have scrap gold with an estimated $600 current market value.

Need to know the value of scrap gold jewelry in pennyweight?

Check out my article with step-by-step instructions.

March 2015 Note: I hope this article was clear. I wrote it about six years ago and have revised it multiple times, and it's been copied quite a bit over the web. If you have any trouble, please leave a comment and tell me where you're stuck, and I'll try to help you. Good luck!

Disclosure

The author of this article may earn commissions from items purchased from this page through the Amazon.com or eBay.com affiliate programs.

Questions & Answers

    © 2009 Chris Telden

    Are You Having Trouble With Your Calculation? Don't Be Shy. Ask Here

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      • profile image

        Vanessa 

        4 years ago

        I was really looking for math tips on deci grams and other metric system helps but this sort of worked

      • profile image

        radhika 

        6 years ago

        can i get clear example how to calculate gold rate? i didn't understand by the above example.......

      • profile image

        Franny D 

        6 years ago

        Thank You so much, this was extremely helpful, and eye opening. If you are going to sell your gold or silver for scrape you should definitely have a good idea of what it is worth ahead of time. Plus..take the stones out of your jewelry..they will estimate the weight and of course most will estimate in their favor..2...you probably can sell them separately. In any case if you have diamonds in a ring or necklace for example you might want to go to a reputable jeweler first..you might actually get more by selling the whole ring. Good Luck Everyone

      • Chris Telden profile imageAUTHOR

        Chris Telden 

        7 years ago from Pacific Northwest, U.S.A.

        Hi maryann,

        Do you know the purity/fineness of the gold? I.e., how many karats it is? If so, you can follow the steps in this article to find out its value. Otherwise, you'll probably want to take it in to a reputable jeweler or antique dealer to have it assessed.

        There are also ways you can test it at home involving various chemicals and such - I have no experience with such procedures, though I may research it at some point for an article. I tend to want to avoid hazardous chemicals, myself. :)

      • profile image

        maryann 

        7 years ago

        how do i find out what my old gold is worth?

      • johndwilliams profile image

        johndwilliams 

        7 years ago from Essex England

        Very interesting thanks - I will need to have a sort out now of my old old - great information!

      • profile image

        Linda  

        7 years ago

        This was simple and perfect. I was able to get a ballpark amount using these steps before taking my scrap over to sell it today. Thank you for this, Linda

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