Convert Grains to Troy Ounces
1 grain (gr) equals 0.002083333333 troy ounces (oz t).
1 gr = 0.002083333333 oz t
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk grain to troy ounce converter to paste a column from Excel.
How to Convert Grain to Troy Ounce
- 1 gr = 0.002083333333 oz t
- 1 oz t = 480 gr
- Example: convert 15 gr to oz t: 15 gr = 15 × 0.002083333333 oz t = 0.03125 oz t
Reference conditions. gr: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
oz t = gr ÷ 480
Derivation from SI units:
- 1 gr = 1/7000 lb = 64.79891 mg (exact)
- 1 oz t = 480 gr = 31.1034768 g (exact)
- 1 gr = 0.00006479891 kg ÷ 0.0311034768 kg per oz t = 0.002083333333333 oz t
Both units are defined exactly, so the factor is exact. Grain definition: grain; Troy Ounce definition: troy ounce.
Worked examples
- A reading of 40 gr converts to 0.08333333333 oz t.
40 gr × 0.002083333333 = 0.08333333333 oz t - A value of 150 gr is 0.3125 oz t.
150 gr × 0.002083333333 = 0.3125 oz t
Grain to Troy Ounce conversion table
| Grains (gr) | Troy Ounces (oz t) |
|---|---|
| 1 gr | 0.002083333333 oz t |
| 5 gr | 0.01041666667 oz t |
| 10 gr | 0.02083333333 oz t |
| 15 gr | 0.03125 oz t |
| 20 gr | 0.04166666667 oz t |
| 40 gr | 0.08333333333 oz t |
| 55 gr | 0.1145833333 oz t |
| 100 gr | 0.2083333333 oz t |
| 115 gr | 0.2395833333 oz t |
| 124 gr | 0.2583333333 oz t |
| 150 gr | 0.3125 oz t |
| 180 gr | 0.375 oz t |
| 300 gr | 0.625 oz t |
| 1000 gr | 2.083333333 oz t |
| 7000 gr | 14.58333333 oz t |
Where it's used
Grains are used for bullet and powder weights, while troy ounces appear in gold, silver and platinum prices. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Grain to other weight and mass units
| Conversion | 1 gr equals |
|---|---|
| grain to kilogram | 0.00006479891 kg |
| grain to gram | 0.06479891 g |
| grain to milligram | 64.79891 mg |
| grain to microgram | 64798.91 µg |
| grain to metric ton | 6.479891 × 10⁻⁸ t |
| grain to pound | 0.0001428571429 lb |
| grain to ounce | 0.002285714286 oz |
| grain to stone | 0.00001020408163 st |
| grain to short ton | 7.142857143 × 10⁻⁸ ton (US) |
| grain to long ton | 6.37755102 × 10⁻⁸ ton (UK) |
| grain to troy ounce | 0.002083333333 oz t |
| grain to carat | 0.32399455 ct |
Frequently asked questions
How many troy ounces are in 1 grain?
1 gr = 0.002083333333 oz t.
How do I convert grains to troy ounces?
Multiply the value in gr by 0.002083333333, or divide it by 480. For example, 15 gr × 0.002083333333 = 0.03125 oz t.
Is the gr to oz t conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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, "grain (gr)".
- 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). Convert Grains to Troy Ounces. Retrieved October 17, 2026, from https://scientificconverters.com/mass/grains-to-troy-ounces/
IEEE
Scientific Converters, "Convert Grains to Troy Ounces," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/grains-to-troy-ounces/