Gold Purity Calculator

Gold is said to be 100% pure when it comprises of 24 karats. Gold jewellery is usually not made from pure gold, as it is too soft and can bend easily. To make it harder and more suitable for making jewellery, it is mixed with other metals, such as zinc, copper, silver, etc. Our online gold purity calculator will offer quick answers to your calculation and conversion needs. With this calculator, you can calculate the percentage of pure gold by entering the karat value visible on your gold jewellery piece. Use the calculator to enter any Karat value from 1 to 24 and get it quickly converted into percentage of pure gold. 

To know more about how the actual amount of pure gold in your jewellery is calculated, firstly you need to know its weight and karat.

Know the Karats of your Gold Jewellery

Determine the karat of your gold jewellery by looking at its karat marks that are usually stamped in places that are not readily visible, like the inner side of a ring or a bangle. And Karats are denoted by the sign K or Kt. The standard karat numbers you will see are 10K, 14K, 18K, 20K, and 22K.

Another way some jewellers mark their gold jewellery is by using parts-per-thousand numbers instead of karats. This parts-per-thousand value can be converted to a percentage by dividing by 10. For instance, the parts-per-thousand mark 585 means that the jewellery contains 58.5% of pure gold. To convert parts per thousand value into karats, you just need to divide it by 1000 and multiply by 24. For example, when we convert the mark value 585 by the process mentioned above, we get the final value as 14.04, which is actually equal to 14 karats.

Also, explore our newly launched gold coins online in 22K and 24K. And don’t forget to learn about the current gold price in India before buying any gold item.

Convert Gold Karats to a Percentage

Once you know the karats of your gold jewellery, it's best to convert them to a percentage in order to figure out what part of the gold alloy you have is actually pure gold.

This simple calculation is done by dividing the karat number of your jewellery by 24 and then multiplying the result by 100.

For example, if you know that a gold item is 18 karats, divide 18 by 24. You have 0.75. And multiplied by 100 is equal to 75% of gold content.

Weigh your Gold Jewellery

To weigh your gold, you will need a sensitive scale. Normally gold is measured in grams, but many jewellers and gold dealers use troy ounces and pennyweights. So, in some cases, you might need to convert your measurements to these units. Never weigh your gold jewellery along with any diamonds or other gemstones studded on it - you need the weight of the gold alloy parts only.

The Final Calculation: To know the amount of pure gold in your jewellery

So finally to determine the amount of pure gold in your jewellery, you need to simply multiply the weight of your precious jewellery in grams by its purity percentage.

For example, if you have an 18K gold chain that weighs 8 grams, knowing that 18 karats equal to 75% of purity, you can calculate the pure gold in the chain which is 6 grams.