Troy Ounce
Troy Ounce Calculator
Free troy ounce calculator for gold, silver, and platinum. Convert troy ounces to live melt value at current spot prices.
Use the calculatorAbout troy ounce
The troy ounce is the standard unit for pricing precious metals. It weighs 31.1035 grams - about 10% more than the everyday avoirdupois ounce (28.35 grams) used for food and shipping.
Because gold, silver, and platinum spot prices are all quoted per troy ounce, valuing bullion is direct: weight in troy ounces ? purity ? spot. Choose your metal and purity below.
Worked example at an illustrative gold spot of $4,000.00 per troy ounce (use the live price above for current figures):
How to calculate troy ounce value
- Weigh the item. Use a digital gram or pennyweight scale. Heavier, solid pieces give the most reliable estimate.
- Select the metal and purity. Pick gold, silver, or platinum, then choose the karat or fineness. Use Custom to enter an exact percentage.
- Confirm the live spot price. The calculator fills in the current spot price automatically. Edit it if you use a different quote.
- Calculate and adjust payout. Press Calculate to see the melt value, then move the payout slider to model a buying offer.
Troy Ounce Calculator questions
How many grams are in a troy ounce?
A troy ounce is 31.1035 grams - heavier than a standard ounce (28.35 g). Always confirm which ounce a scale is measuring.
Why are precious metals weighed in troy ounces?
It is a centuries-old standard for precious metals that keeps gold, silver, and platinum pricing consistent worldwide.
Is a troy ounce of gold the same as an ounce of silver?
They are the same weight (31.1035 g) but very different value, because gold and silver have different spot prices per troy ounce.
How do I convert troy ounces to grams?
Multiply troy ounces by 31.1035. The calculator handles this automatically when you switch units.