Convert Troy Ounces to Grains
1 troy ounce (oz t) equals 480 grains (gr).
1 oz t = 480 gr
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk troy ounce to grain converter to paste a column from Excel.
How to Convert Troy Ounce to Grain
- 1 oz t = 480 gr
- 1 gr = 0.002083333333 oz t
- Example: convert 15 oz t to gr: 15 oz t = 15 × 480 gr = 7200 gr
Reference conditions. gr: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
gr = oz t × 480
Derivation from SI units:
- 1 oz t = 480 gr = 31.1034768 g (exact)
- 1 gr = 1/7000 lb = 64.79891 mg (exact)
- 1 oz t = 0.0311034768 kg ÷ 0.00006479891 kg per gr = 480 gr
Both units are defined exactly, so the factor is exact. Troy Ounce definition: troy ounce; Grain definition: grain.
Worked examples
- A reading of 2 oz t converts to 960 gr.
2 oz t × 480 = 960 gr - A value of 32.15 oz t is 15432 gr.
32.15 oz t × 480 = 15432 gr
Troy Ounce to Grain conversion table
| Troy Ounces (oz t) | Grains (gr) |
|---|---|
| 0.1 oz t | 48 gr |
| 0.25 oz t | 120 gr |
| 0.5 oz t | 240 gr |
| 1 oz t | 480 gr |
| 2 oz t | 960 gr |
| 5 oz t | 2400 gr |
| 10 oz t | 4800 gr |
| 20 oz t | 9600 gr |
| 32.15 oz t | 15432 gr |
| 50 oz t | 24000 gr |
| 100 oz t | 48000 gr |
| 400 oz t | 192000 gr |
Where it's used
Troy Ounces are used for gold, silver and platinum prices, while grains appear in bullet and powder weights. Both measure mass (commonly called weight), so the conversion is a fixed factor.
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
How many grains are in 1 troy ounce?
1 oz t = 480 gr.
How do I convert troy ounces to grains?
Multiply the value in oz t by 480. For example, 15 oz t × 480 = 7200 gr.
Is the oz t to gr conversion exact?
Yes. Both units are defined exactly, and 1 oz t is exactly 480 gr.
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)".
- 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, "grain (gr)".
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 Grains. Retrieved October 17, 2026, from https://scientificconverters.com/mass/troy-ounces-to-grains/
IEEE
Scientific Converters, "Convert Troy Ounces to Grains," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/troy-ounces-to-grains/