Density and Mass
oztodwt
Convert ounces (avoirdupois) (oz) to pennyweights (troy) (dwt).
Factor1 oz = 18.22917 dwt
Converter
oz
Accepts numbers or expressions, e.g. 150 + 14.7
Result
dwt
Rendered to 6 significant figures.
Formula
Formula
dwt = oz × 18.22917
Multiply any value in ounces (avoirdupois) by 18.22917 to obtain the value in pennyweights (troy).
Worked example
Convert 1 oz to dwt.
- 01Start with 1 oz.
- 02Multiply by the conversion factor: 1 × 18.22917 = 18.2292 dwt.
Result1 oz = 18.2292 dwt
Conversion table
| oz | dwt |
|---|---|
| 1 | 18.229 |
| 2 | 36.458 |
| 5 | 91.146 |
| 10 | 182.29 |
| 20 | 364.58 |
| 50 | 911.46 |
| 100 | 1822.9 |
| 200 | 3645.8 |
| 500 | 9114.6 |
| 1000 | 18229 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from oz to dwt?
1 oz equals 18.22917 dwt. To convert, multiply the value in ounces (avoirdupois) by 18.22917.
How do I convert 1 oz to dwt?
1 oz = 18.2292 dwt. For any value, multiply by 18.22917.
How do I convert dwt back to oz?
Divide by the same factor — or equivalently, multiply by 0.05485714. So 1 dwt = 0.0548571 oz.
When would I need to convert ounce (avoirdupois) to pennyweight (troy)?
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).