Gold Purity Calculator | Convert Karat Percentage Fineness | Karat.au

Australian Gold Purity Calculator

At Karat.au, we believe that understanding what you’re buying is essential when it comes to gold. Whether you’re an experienced collector or new to the world of precious metals, gold purity can sometimes feel like a complex concept with its various measurement systems across different countries and traditions.

Our Gold Purity Calculator bridges this knowledge gap, offering a straightforward way to convert between the three primary gold purity measurements used throughout Australia and internationally.

Three Ways to Measure Gold Purity

Karat (K) – The traditional measurement that divides gold purity into 24 parts. Pure gold is 24K, while 18K gold contains 18 parts gold and 6 parts other metals, making it 75% pure.

Percentage (%) – The most intuitive measurement, simply expressing what portion of an item is pure gold. Investment-grade gold typically ranges from 99.5% to 99.99% pure.

Fineness – Used primarily in official and international contexts, this three-digit number represents parts per thousand. For example, Australian Gold Kangaroo coins have a fineness of 999.9 (99.99% pure).

Why Purity Matters for Australian Gold

Australia has a proud history as one of the world’s leading gold producers, with our gold renowned for its exceptional quality. Understanding purity helps you:

• Accurately assess the true value of your gold items
• Make informed decisions when buying or selling gold jewellery
• Understand why certain gold items may be priced differently
• Appreciate the craftsmanship involved in creating different gold alloys

How to Use Our Calculator

1. Select your preferred input type (Karat, Percentage, or Fineness)
2. Enter your known value
3. Click “Convert” to instantly see the equivalent values in all three systems

For added convenience, we’ve included quick-select buttons for common gold purity standards, including those most frequently found in Australian gold products.

Beyond the Numbers

Remember that gold purity isn’t just about value – it also affects durability, colour, and suitability for different uses. Pure 24K gold is prized for investment but may be too soft for everyday jewellery, while 9K gold offers greater durability at a more accessible price point.

Our calculator helps you navigate these considerations with confidence, whether you’re evaluating a family heirloom, considering an investment piece, or simply expanding your knowledge of Australian gold.

This tool provides conversions for informational purposes only. For professional appraisals of gold items, we recommend consulting with a certified gold appraiser or jeweller.