Density and Mass
lbtoslug
Convert pounds (avoirdupois) (lb) to slugs (slug).
Factor1 lb = 0.03108095 slug
Converter
lb
Accepts numbers or expressions, e.g. 150 + 14.7
Result
slug
Rendered to 6 significant figures.
Formula
Formula
slug = lb × 0.03108095
Multiply any value in pounds (avoirdupois) by 0.03108095 to obtain the value in slugs.
Worked example
Convert 100 lb to slug.
- 01Start with 100 lb.
- 02Multiply by the conversion factor: 100 × 0.03108095 = 3.1081 slug.
Result100 lb = 3.1081 slug
Conversion table
| lb | slug |
|---|---|
| 1 | 0.031081 |
| 2 | 0.062162 |
| 5 | 0.1554 |
| 10 | 0.31081 |
| 20 | 0.62162 |
| 50 | 1.554 |
| 100 | 3.1081 |
| 200 | 6.2162 |
| 500 | 15.54 |
| 1000 | 31.081 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from lb to slug?
1 lb equals 0.03108095 slug. To convert, multiply the value in pounds (avoirdupois) by 0.03108095.
How do I convert 1 lb to slug?
1 lb = 0.031081 slug. For any value, multiply by 0.03108095.
How do I convert slug back to lb?
Divide by the same factor — or equivalently, multiply by 32.17405. So 1 slug = 32.174 lb.
When would I need to convert pound (avoirdupois) to slug (engineering imperial mass)?
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).