Mass per volume density.
Slugs per Quart to Pounds per Gallon Converter — slug/qt to lb/gal
Convert Slug per Quart (slug/qt) to Pound per Gallon (lb/gal) using the exact conversion factor (1 slug per quart = 128.6961942 pound per gallon). See the formula, worked examples, conversion table, and common uses.
Slugs per Quart to Pounds 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 15421.20516 / 119.8264273.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Slugs per Quart to Pounds per Gallon
Slug per Quart and Pound 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. Both are mass per volume density units.
Formula
pounds per gallon = slugs per quart × 128.696194226
This factor comes from each unit's defined relationship to the category's base unit: 1 slug per quart equals 15421.2051633 base units, and 1 pound per gallon equals 119.826427317 base units, so dividing one by the other gives the direct slug per quart-to-pound per gallon factor of 128.696194226.
Simple example
1 slug/qt × 128.6961942 = 128.6961942 lb/gal
1 slug per quart = 128.6961942 pounds per gallon.
Real-world example
1,000 slug/qt × 128.6961942 = 128,696.1942 lb/gal
1,000 slugs per quart = 128,696.1942 pounds per gallon.
Conversion table
| Slug per Quart (slug/qt) | Pound per Gallon (lb/gal) |
|---|---|
| 0.1 slug/qt | 12.86961942 lb/gal |
| 1 slug/qt | 128.6961942 lb/gal |
| 10 slug/qt | 1,286.961942 lb/gal |
| 100 slug/qt | 12,869.61942 lb/gal |
| 1,000 slug/qt | 128,696.1942 lb/gal |
| 10,000 slug/qt | 1,286,961.942 lb/gal |
Reverse conversion: Pound per Gallon to Slug per Quart
128.6961942 lb/gal × 0.007770237543 = 0.9999999998 slug/qt
128.6961942 pounds per gallon = 0.9999999998 slugs per quart.
slugs per quart = pounds per gallon × 0.0077702375429
For a page dedicated to this direction, see Pound per Gallon to Slug per Quart.
Understanding the Slug per Quart (slug/qt)
Mass per volume density.
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
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 pounds per gallon are in 1 slug per quart?
1 slug per quart equals 128.6961942 pounds per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert slug per quart to pound per gallon?
Multiply the slug per quart value by 128.6961942. The converter above does this instantly to whatever precision you set.
How do I convert pound per gallon back to slug per quart?
Use the reverse factor: 1 pound per gallon equals 0.0077702375 slugs per quart. You can also use the swap control in the converter above to flip the direction instantly.
What is a slug per quart?
Slug per Quart (slug/qt) is a unit of density.
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.
Is the slug per quart to pound per gallon conversion exact?
Yes. Both slug per quart and pound per gallon are defined by fixed standards rather than physical artifacts, so the factor of 128.6961942 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.