Gold Karat Converter — Calculate Equivalent Weight Between All Karats

Convert weight between different gold karats (24, 22, 21, 18, 14...) with accurate explanation of ratios and calculation steps

Full Gold Karat Conversion Table

Use the following table for quick conversion between all karats. To calculate your gold value in local currency, use the gold value calculator with the current gold prices.

Ratios indicate conversion factor from row (from) to column (to). Numbers shown as % for quick reference.
From ↓ \ To → 24k 22k 21k 18k 14k 10k 9k
24k 100%109.1%114.3%133.3%171.4%240%266.7%
22k 91.7%100%104.8%122.2%157.1%220%244.4%
21k 87.5%95.5%100%116.7%150%210%233.3%
18k 75%81.8%85.7%100%128.6%180%200%
14k 58.3%63.6%66.7%77.8%100%140%155.6%
10k 41.7%45.5%47.6%55.6%71.4%100%111.1%
9k 37.5%40.9%42.9%50%64.3%90%100%
Quick example: 100g of 21k → 24k = 100 × 0.875 = 87.5 g of 24k

Why Do We Need to Convert Gold Karats?

Converting gold karats is not just a mathematical exercise — it is a practical necessity in daily life when dealing with gold. Here are the most important situations where conversion is needed:

🏪

When Buying or Selling

You have 100g of 21k gold and want to know how much it equals in 24k to calculate the true value. Shops calculate prices based on pure gold (24k). Use the sell calculator or the buy calculator with the converter.

🔄

Exchanging Gold Pieces

You want to exchange an 18k piece for a 21k piece. The shop will calculate the equivalent weight in pure gold to ensure a fair exchange. 100g of 18k = 75g of 24k = 85.7g of 21k.

📊

Calculating Zakat

Zakat is calculated on pure gold (24k). If you have 21k or 18k gold, you must convert it first to find the true weight of pure gold. Use the zakat calculator after conversion.

Important tip: Understand the difference between weight and value

Weight increases when converting to a lower karat, but value stays the same (without making charges). Example:

  • 100 g of 24k = value 48,413 Riyal (at price 484.1 Riyal /gram)
  • = 114.3 g of 21k = same value 48,413 Riyal (at price 423.6 Riyal /gram)
  • = 133.3 g of 18k = same value 48,413 Riyal (at price 363.1 Riyal /gram)

💡 Conclusion: More weight does not mean more value! What matters is the amount of pure gold (24k) inside the piece. Use the current gold prices to calculate the final value.

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.
Why is 21k the most common in Saudi Arabia?
Good balance between purity (87.5%) and hardness, suitable for everyday jewellery, reasonable price, and aligned with local traditions.

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