🪙 Why Coin Size and Weight Matter
Every Australian coin tells a story — and its size, metal, and weight are key parts of that story.
Whether you’re organising your collection or buying capsules, knowing exact sizes and weights ensures you store and value your coins correctly.
Here’s your complete guide from Coin Suply Australia.
🇦🇺 1️⃣ Australian Circulating Coin Dimensions
| Denomination | Diameter | Weight | Composition | Notes |
|---|---|---|---|---|
| 5c | 19.41 mm | 2.83 g | 75% Cu, 25% Ni | Smallest Australian coin |
| 10c | 23.60 mm | 5.65 g | 75% Cu, 25% Ni | Features lyrebird |
| 20c | 28.65 mm | 11.30 g | 75% Cu, 25% Ni | Platypus design |
| 50c (dodecagon) | 31.65 mm | 15.55 g | 75% Cu, 25% Ni | 12-sided; highly collectible variants |
| $1 | 25.00 mm | 9.00 g | 92% Cu, 6% Al, 2% Ni | Features five kangaroos |
| $2 | 20.50 mm | 6.60 g | 92% Cu, 6% Al, 2% Ni | Aboriginal Elder design |
Coin Suply offers perfectly sized capsules and holders for each Australian coin denomination.
🪙 2️⃣ Bullion & Collector Coin Sizes
| Type | Diameter | Weight | Metal | Mint |
|---|---|---|---|---|
| 1oz Silver Kangaroo | 40.6 mm | 31.107 g | 99.99% Silver | Perth Mint |
| 1oz Silver Kookaburra | 40.9 mm | 31.107 g | 99.99% Silver | Perth Mint |
| 1oz Gold Kangaroo | 32.6 mm | 31.107 g | 99.99% Gold | Perth Mint |
| 1oz Platinum Platypus | 32.6 mm | 31.107 g | 99.95% Platinum | Perth Mint |
| $1 RAM Silver Proof Coin | ~40 mm | 31.635 g | 99.9% Silver | Royal Australian Mint |
💡 Note: Special issues (e.g., 2oz, 5oz, 1kg) vary by design and series. Always check specifications on the product page.
⚙️ 3️⃣ Why Size & Weight Matter to Collectors
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Fitting the Right Capsules: Avoid loose fits or pressure cracks.
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Detecting Counterfeits: Weight discrepancies often reveal fakes.
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Organising Displays: Matching sizes helps with uniform presentation.
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Understanding Value: Larger coins ≠ higher value — rarity and metal purity matter more.
Coin Suply’s product descriptions include exact measurements so you can order the correct capsules and storage every time.
🧠 Final Thoughts
Knowing your coin sizes and weights makes collecting easier, safer, and more rewarding.
It’s the foundation of understanding your coins — and preserving them properly.
👉 Browse Coin Suply’s range of Coin Capsules & Holders sized perfectly for Australian circulating, proof, and bullion coins.