Convert Troy Ounces to Grams
1 troy ounce (oz t) equals 31.1034768 grams (g).
1 oz t = 31.1034768 g
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk troy ounce to gram converter to paste a column from Excel.
How to Convert Troy Ounce to Gram
- 1 oz t = 31.1034768 g
- 1 g = 0.03215074657 oz t
- Example: convert 15 oz t to g: 15 oz t = 15 × 31.1034768 g = 466.552152 g
Formula
g = oz t × 31.1034768
Derivation from SI units:
- 1 oz t = 480 gr = 31.1034768 g (exact)
- 1 g = 10⁻³ kg
- 1 oz t = 0.0311034768 kg ÷ 0.001 kg per g = 31.1034768 g
Both units are defined exactly, so the factor is exact. Troy Ounce definition: troy ounce; Gram definition: gram.
Worked examples
- A 1 oz t gold coin contains 31.1034768 g of gold.
1 oz t × 31.1034768 = 31.1034768 g - A 10 oz t silver bar weighs 311.034768 g.
10 oz t × 31.1034768 = 311.034768 g
Troy Ounce to Gram conversion table
| Troy Ounces (oz t) | Grams (g) |
|---|---|
| 0.1 oz t | 3.11034768 g |
| 0.25 oz t | 7.7758692 g |
| 0.5 oz t | 15.5517384 g |
| 1 oz t | 31.1034768 g |
| 2 oz t | 62.2069536 g |
| 5 oz t | 155.517384 g |
| 10 oz t | 311.034768 g |
| 20 oz t | 622.069536 g |
| 32.15 oz t | 999.9767791 g |
| 50 oz t | 1555.17384 g |
| 100 oz t | 3110.34768 g |
| 400 oz t | 12441.39072 g |
Where it's used
Precious-metal prices are quoted per troy ounce; converting to grams gives the price per gram used by jewellers and in many markets.
Troy Ounce to other weight and mass units
| Conversion | 1 oz t equals |
|---|---|
| troy ounce to kilogram | 0.0311034768 kg |
| troy ounce to gram | 31.1034768 g |
| troy ounce to milligram | 31103.4768 mg |
| troy ounce to microgram | 31103476.8 µg |
| troy ounce to metric ton | 0.0000311034768 t |
| troy ounce to pound | 0.06857142857 lb |
| troy ounce to ounce | 1.097142857 oz |
| troy ounce to stone | 0.004897959184 st |
| troy ounce to short ton | 0.00003428571429 ton (US) |
| troy ounce to long ton | 0.0000306122449 ton (UK) |
| troy ounce to grain | 480 gr |
| troy ounce to carat | 155.517384 ct |
Frequently asked questions
Why is a troy ounce heavier than an ounce?
A troy ounce is 480 grains (31.1034768 g); an ordinary ounce is 437.5 grains (28.349523125 g).
How many grams are in 1 troy ounce?
1 oz t = 31.1034768 g.
How do I convert troy ounces to grams?
Multiply the value in oz t by 31.1034768. For example, 15 oz t × 31.1034768 = 466.552152 g.
Is the oz t to g conversion exact?
Yes. Both units are defined exactly, and 1 oz t is exactly 31.1034768 g.
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)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
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). Convert Troy Ounces to Grams. Retrieved October 17, 2026, from https://scientificconverters.com/mass/troy-ounces-to-grams/
IEEE
Scientific Converters, "Convert Troy Ounces to Grams," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/troy-ounces-to-grams/