Density and Mass
oztogr
Convert ounces (avoirdupois) (oz) to grains (gr).
Factor1 oz = 437.5 gr
Converter
oz
Accepts numbers or expressions, e.g. 150 + 14.7
Result
gr
Rendered to 6 significant figures.
Formula
Formula
gr = oz × 437.5
Multiply any value in ounces (avoirdupois) by 437.5 to obtain the value in grains.
Worked example
Convert 1 oz to gr.
- 01Start with 1 oz.
- 02Multiply by the conversion factor: 1 × 437.5 = 437.5 gr.
Result1 oz = 437.5 gr
Conversion table
| oz | gr |
|---|---|
| 1 | 437.5 |
| 2 | 875 |
| 5 | 2187.5 |
| 10 | 4375 |
| 20 | 8750 |
| 50 | 21875 |
| 100 | 43750 |
| 200 | 87500 |
| 500 | 2.1875e+5 |
| 1000 | 4.3750e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from oz to gr?
1 oz equals 437.5 gr. To convert, multiply the value in ounces (avoirdupois) by 437.5.
How do I convert 1 oz to gr?
1 oz = 437.5 gr. For any value, multiply by 437.5.
How do I convert gr back to oz?
Divide by the same factor — or equivalently, multiply by 0.002285714. So 1 gr = 0.00228571 oz.
When would I need to convert ounce (avoirdupois) to grain (troy/apothecary)?
Mass conversions appear in material balances, reagent dosing, and reconciling vendor specifications across imperial/metric systems.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).