Troy Ounce (oz t)
The troy ounce (oz t) is 480 grains, exactly 31.1034768 g, about 10 % heavier than the ordinary ounce.
Symbol: oz t (ASCII: ozt)
Quantity: mass (commonly called weight)
SI relation: 1 oz t = 0.0311034768 kg (exact)
Derivation: 1 oz t = 480 gr = 31.1034768 g (exact)
Exact: yes, by definition
Typical uses
- Gold, silver and platinum prices
- Bullion bars (a "good delivery" gold bar is about 400 oz t)
- Coin weights
Convert troy ounces to other units
| Conversion | 1 oz t equals | Reverse |
|---|---|---|
| troy ounce to kilogram | 0.0311034768 kg | kilogram to troy ounce |
| troy ounce to gram | 31.1034768 g | gram to troy ounce |
| troy ounce to milligram | 31103.4768 mg | milligram to troy ounce |
| troy ounce to pound | 0.06857142857 lb | pound to troy ounce |
| troy ounce to ounce | 1.097142857 oz | ounce to troy ounce |
| troy ounce to microgram | 31103476.8 µg | microgram to troy ounce |
| troy ounce to metric ton | 0.0000311034768 t | metric ton to troy ounce |
| troy ounce to stone | 0.004897959184 st | stone to troy ounce |
| troy ounce to short ton | 0.00003428571429 ton (US) | short ton to troy ounce |
| troy ounce to long ton | 0.0000306122449 ton (UK) | long ton to troy ounce |
| troy ounce to grain | 480 gr | grain to troy ounce |
| troy ounce to carat | 155.517384 ct | carat to troy ounce |
Open the Weight and Mass Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (troy or apothecary)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Troy Ounce (oz t). Retrieved October 17, 2026, from https://scientificconverters.com/units/troy-ounce/
IEEE
Scientific Converters, "Troy Ounce (oz t)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/troy-ounce/