Convert Pound to Slug
Convert pounds to slugs instantly. 1 pound = 0.0310809502 slug — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Slug to Pound converter for the reverse conversion.
Units explained
Pound
The pound (lb) is a unit of mass equal to exactly 0.45359237 kilogram.
From Latin 'libra pondo' (a pound by weight); the symbol lb comes from 'libra'.
The primary weight unit in the United States and informally in the UK.
The international avoirdupois pound was fixed in the 1959 yard-and-pound agreement.
Slug
The slug is the mass that accelerates at 1 ft/s^2 under a force of one pound-force, about 14.59 kg.
Coined in the early 20th century for the British gravitational (engineering) system.
US and British engineering dynamics.
Introduced in the British gravitational system of units.
Pound to Slug conversion formula
The relationship between pounds and slugs:
To convert pounds to slugs, multiply the value in pounds by 0.0310809502. To reverse, multiply slugs by 32.1740485564.
How to use this converter
Type a value into the calculator. The result in slugs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Slug to Pound converter for the reverse direction.
Step-by-step: convert pounds to slugs
- Write down the value in pounds (lb).
- Multiply that value by the factor 0.0310809502.
- The product is the equivalent value in slugs (slug).
- To reverse, multiply the slug value by 32.1740485564.
Worked examples
Example 1 — Convert 1 lb to slug:
1 × 0.0310809502 = 0.0310809502 slug
Example 2 — Convert 100 lb to slug:
100 × 0.0310809502 = 3.1080950172 slug
Real-world example — Adult height conversion
A 1.8-pound-tall person measures a value in slugs that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 lb × 0.0310809502 = 0.0559457103 slug
Real-world example — Fabric purchase length
Two pounds of fabric equals a value in slugs essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 lb × 0.0310809502 = 0.0621619003 slug
Real-world example — Maritime depth conversion
A 10-pound sounding depth converts cleanly into slugs. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 lb × 0.0310809502 = 0.3108095017 slug
Pound to Slug conversion table
Standard reference values for converting pounds to slugs:
| Pound [lb] | Slug [slug] |
|---|---|
| 0.01 | 0.0003108095 |
| 0.1 | 0.003108095 |
| 1 | 0.0310809502 |
| 2 | 0.0621619003 |
| 3 | 0.0932428505 |
| 4 | 0.1243238007 |
| 5 | 0.1554047509 |
| 10 | 0.3108095017 |
| 20 | 0.6216190034 |
| 30 | 0.9324285051 |
| 40 | 1.2432380069 |
| 50 | 1.5540475086 |
| 100 | 3.1080950172 |
| 500 | 15.5404750858 |
| 1000 | 31.0809501716 |
Frequently asked questions
How many slugs is 1 pound?
How do I convert pounds to slugs?
How do I convert slugs back to pounds?
How many slugs is 100 pounds?
Popular weight unit conversions
Convert Pound to other weight units
Show all Pound conversions
Metric / SI (18 units)
Avoirdupois (14 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 lb = 0.0310809502 slug) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.