Mass per volume density.
Pounds per Gallon to Slugs per Gallon Converter — lb/gal to slug/gal
Convert Pound per Gallon (lb/gal) to Slug per Gallon (slug/gal) using the exact conversion factor (1 pound per gallon = 0.0310809502 slug per gallon). See the formula, worked examples, conversion table, and common uses.
Pounds per Gallon to Slugs per Gallon converter
Converter
Density Converter
Convert thousands of mass-per-volume density combinations for science, engineering, agriculture, and fluids.
Context values
Some unit families need one extra value for a physically accurate result.
Mass per volume density.
Result = input x 119.8264273 / 3855.301291.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Gallon to Slugs per Gallon
Pound per Gallon and Slug per Gallon both measure density — mass per unit volume — a property used to identify materials, check manufacturing quality, and predict whether something floats or sinks. As a fixed reference point, water has a density of exactly 1000 kg/m³ (1 g/cm³, 1 g/mL) at its temperature of maximum density, which is why many density figures in science and engineering are quoted relative to water. Pound per Gallon is most often used for us paint and coatings density specifications.
Formula
slugs per gallon = pounds per gallon × 0.0310809501716
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per gallon equals 119.826427317 base units, and 1 slug per gallon equals 3855.30129084 base units, so dividing one by the other gives the direct pound per gallon-to-slug per gallon factor of 0.0310809501716.
Simple example
1 lb/gal × 0.03108095017 = 0.0310809502 slug/gal
1 pound per gallon = 0.0310809502 slugs per gallon.
Real-world example
1,000 lb/gal × 0.03108095017 = 31.08095017 slug/gal
1,000 pounds per gallon = 31.08095017 slugs per gallon.
Conversion table
| Pound per Gallon (lb/gal) | Slug per Gallon (slug/gal) |
|---|---|
| 0.1 lb/gal | 0.003108095 slug/gal |
| 1 lb/gal | 0.0310809502 slug/gal |
| 10 lb/gal | 0.3108095017 slug/gal |
| 100 lb/gal | 3.108095017 slug/gal |
| 1,000 lb/gal | 31.08095017 slug/gal |
| 10,000 lb/gal | 310.8095017 slug/gal |
Reverse conversion: Slug per Gallon to Pound per Gallon
0.0310809502 slug/gal × 32.17404856 = 1.000000001 lb/gal
0.0310809502 slugs per gallon = 1.000000001 pounds per gallon.
pounds per gallon = slugs per gallon × 32.1740485564
For a page dedicated to this direction, see Slug per Gallon to Pound per Gallon.
Understanding the Pound per Gallon
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
Where it's used: United States (paint, fuel, and industrial liquid density specifications)
lb/gal vs. lb/ft³. Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.
Uses of the Pound per Gallon today
- US paint and coatings density specifications
- US fuel and petroleum liquid density specs
- Industrial liquid handling and shipping weight calculations
Understanding the Slug per Gallon (slug/gal)
Mass per volume density.
Pound per Gallon — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many slugs per gallon are in 1 pound per gallon?
1 pound per gallon equals 0.0310809502 slugs per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per gallon to slug per gallon?
Multiply the pound per gallon value by 0.03108095017. The converter above does this instantly to whatever precision you set.
How do I convert slug per gallon back to pound per gallon?
Use the reverse factor: 1 slug per gallon equals 32.17404856 pounds per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per gallon?
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
What is a slug per gallon?
Slug per Gallon (slug/gal) is a unit of density.
Is the pound per gallon to slug per gallon conversion exact?
Yes. Both pound per gallon and slug per gallon are defined by fixed standards rather than physical artifacts, so the factor of 0.03108095017 used above is exact to as many digits as you choose to display.
What is the difference between lb/gal vs. lb/ft³?
Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.
Where is the pound per gallon still used today?
United States (paint, fuel, and industrial liquid density specifications)