Converter for weight, fineness and currency
One quantity, every unit. Enter a number and see it converted to all common weight units and to three currencies at once.
| gram | 31,1035 |
|---|---|
| kilo | 0,0311 |
| troy ounce | 1,0000 |
| pennyweight | 20,0000 |
| tola | 2,6667 |
| tael (HK) | 0,8310 |
| pound (avdp.) | 0,0686 |
Value
31,103 g gross · 31,072 g pure gold
| DKK | 27.584,94 kr. |
|---|---|
| EUR | — |
| USD | — |
A troy ounce is 31.1035 grams — not the same as the ordinary ounce of 28.35 grams. Pennyweight is used by goldsmiths, tola in South Asia and tael in Hong Kong and China.
Grams, kilograms, and the international troy ounce
In precious metals trading, grams and kilograms are typically used as metric units, while the international troy ounce is the standard unit in the global trade of gold, silver, and platinum. One troy ounce corresponds exactly to 31.1034768 grams, and this relationship is a fixed, defined constant, not a rounded approximation.
One kilogram equals 1,000 grams, making conversion between kilograms and grams straightforward, but conversion to troy ounces requires dividing or multiplying by the precise factor of 31.1034768 to avoid rounding errors at larger quantities.
Do not confuse the troy ounce with the conventional ounce
A conventional ounce (often called the 'avoirdupois' ounce), used for everyday weight measurements such as food in the US and UK, equals 28.3495 grams and is not the same as a troy ounce of 31.1034768 grams. The difference is about 10%, which is significant when dealing with precious metals.
This confusion is a common source of error in manual conversion. When seeing a price quoted per 'ounce' for gold or silver, it is therefore essential to confirm that it refers to a troy ounce rather than the conventional unit of weight before comparing prices or calculating a total value.
Practical verification of conversion results
When using a precious metals converter, it is always recommended to manually verify the result for important calculations, for example by multiplying the number of troy ounces by 31.1034768 to get grams, or dividing grams by the same factor to get troy ounces.
For larger transactions or legally binding documents, conversion results should be cross-checked against an independent source or a professional, as even small rounding errors can matter for large quantities or high prices per unit.
It is also recommended to use a sufficient number of decimal places when calculating quantities involving large volumes or high unit prices, since even a small rounding in grams or troy ounces can produce a noticeable difference in the total calculated value.
Some online converters also automatically round the result to a certain number of decimal places for readability, which can hide small but relevant differences when comparing multiple calculations, and users should therefore check how many decimal places a given tool actually uses internally.
Questions and answers
How many grams are in a troy ounce?
Exactly 31.1034768 grams.
Is a troy ounce the same as a conventional ounce?
No, a conventional ounce is 28.3495 grams, while a troy ounce is 31.1034768 grams.
How many grams are in a kilogram?
1,000 grams.
Why does the difference between ounce types matter?
Because the roughly 10% difference can cause significant errors when calculating precious metal value.
Should I always check a converter's result?
Yes, especially for large quantities or important transactions, results should be verified manually or by a professional.
Which ounce is used in gold and silver prices?
The international troy ounce, not the conventional avoirdupois ounce.