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Enter weight to convert
Equivalent weight
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=
Pure gold
gram
Conversion ratio
Reverse conversion
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Conversion ratio:
Pure gold:
Reverse conversion:
How to Read Your Result
1
Enter the gold weight
— Start by entering the gold weight in grams (or any other unit)
2
Choose the source karat
— Select the current gold karat (24, 22, 21, 18, 14, 10, or 9 karat)
3
Choose the target karat
— Select the karat you want to convert to
4
View the result
— The equivalent weight will appear with a detailed explanation of the calculation method and conversion ratio
Quick Examples for Common Weights
| Weight (21k) | Equivalent in 24k | Equivalent in 18k |
|---|---|---|
| 10 gram (21k) | 8.8 gram | 11.7 gram |
| 12 gram (21k) | 10.5 gram | 14 gram |
| 18 gram (21k) | 15.8 gram | 21 gram |
| 85 gram (21k) | 74.4 gram | 99.2 gram |
| 150 gram (21k) | 131.3 gram | 175 gram |
Karat Terminology
| Karat | Purity | Common Use |
|---|---|---|
| 24k | 99.9% | Bullion and investment |
| 22k | 91.6% | Traditional jewelry |
| 21k | 87.5% | Most widespread in the Gulf |
| 18k | 75.0% | Modern designs |
Frequently Asked Questions
Why does weight decrease when converting from a lower karat to a higher karat?
Because lower karats contain other metals (copper, silver). When converting to pure gold, these metals are removed, so the weight decreases.
Can gold actually be physically converted between karats?
Yes. You can raise the karat by removing other metals (melting and refining), and lower it by adding copper/silver.
Is karat a unit of weight?
No, karat measures gold purity, not weight. "18 karat" describes the percentage of pure gold in the piece (75%), not how heavy it is — weight is measured separately in grams or ounces, which is exactly what the converter above calculates.