Density and Mass
drtolb
Convert drams (avoirdupois) (dr) to pounds (avoirdupois) (lb).
Factor1 dr = 0.00390625 lb
Converter
dr
Accepts numbers or expressions, e.g. 150 + 14.7
Result
lb
Rendered to 6 significant figures.
Formula
Formula
lb = dr × 0.00390625
Multiply any value in drams (avoirdupois) by 0.00390625 to obtain the value in pounds (avoirdupois).
Worked example
Convert 256 dr to lb.
- 01Start with 256 dr.
- 02Multiply by the conversion factor: 256 × 0.00390625 = 1 lb.
Result256 dr = 1 lb
Conversion table
| dr | lb |
|---|---|
| 1 | 0.0039063 |
| 2 | 0.0078125 |
| 5 | 0.019531 |
| 10 | 0.039063 |
| 20 | 0.078125 |
| 50 | 0.19531 |
| 100 | 0.39063 |
| 200 | 0.78125 |
| 500 | 1.9531 |
| 1000 | 3.9063 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from dr to lb?
1 dr equals 0.00390625 lb. To convert, multiply the value in drams (avoirdupois) by 0.00390625.
How do I convert 1 dr to lb?
1 dr = 0.00390625 lb. For any value, multiply by 0.00390625.
How do I convert lb back to dr?
Divide by the same factor — or equivalently, multiply by 256. So 1 lb = 256 dr.
When would I need to convert dram (avoirdupois) to pound (avoirdupois)?
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).