When buying gold, valuing jewellery or trading precious metals, you encounter units that are unfamiliar in everyday life: the troy ounce, the karat and the fineness in parts per thousand. 1 troy ounce of gold equals 31.1035 grams – not to be confused with the common ounce (28.35 g). Our calculator handles all the conversions.
Step by Step: How to Use the Precious Metal Converter
- Enter the quantity: e.g. "2" for 2 troy ounces of gold.
- Select the source unit: troy ounce, gram or kilogram.
- Select the target unit: e.g. grams.
- Karat content (for jewellery): 18-karat gold contains 18/24 = 75% pure gold – the calculator shows the fine gold content.
- Calculate value: Combined with the current gold price, you can determine the current material value.
Practical Examples
1-troy-ounce gold bar: 1 troy oz = 31.1035 g. At a gold price of $1,900/oz: material value $1,900.
18-karat gold chain, 15 g: Fine gold content: 15 g × 0.75 = 11.25 g of pure gold. At €62/g pure gold: material value approx. €697.50.
1 oz silver coin: 1 troy oz = 31.1035 g of silver (if .999 fine silver). Melt value at €25/oz = €25.
Karat Fineness Overview
- 24 karat = 999.9‰ = 99.99% gold
- 18 karat = 750‰ = 75% gold
- 14 karat = 585‰ = 58.5% gold
- 9 karat = 375‰ = 37.5% gold
1 troy ounce = 31.1035 g
Frequently Asked Questions (FAQ)
- What is the difference between karat (gold purity) and carat (gemstone weight)?
- Karat has two completely different meanings. For precious metals it describes fineness (24 karat = pure gold = 1000/1000). For gemstones, carat is a unit of weight: 1 carat = 0.2 g.
- What does 925 stamped on a silver ring mean?
- 925 is the fineness in parts per thousand: 925/1000 = 92.5% silver = sterling silver. Other marks: 800 = 80% silver (coin silver), 999 = fine silver.
- Is the troy ounce the same as a regular ounce?
- No! Troy ounce = 31.1035 g; avoirdupois ounce (the everyday ounce) = 28.3495 g. Precious metals are always traded in troy ounces.
