Mass per volume density.
Pounds per Gallon to Kilograms per Cubic foot Converter — lb/gal to kg/ft3
Convert Pound per Gallon (lb/gal) to Kilogram per Cubic foot (kg/ft3) using the exact conversion factor (1 pound per gallon = 3.39310656 kilogram per cubic foot). See the formula, worked examples, conversion table, unit comparison, and common uses.
Pounds per Gallon to Kilograms per Cubic foot 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 / 35.31466672.
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 Kilograms per Cubic foot
Pound per Gallon and Kilogram per Cubic foot 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
kilograms per cubic foot = pounds per gallon × 3.39310656
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 kilogram per cubic foot equals 35.3146667215 base units, so dividing one by the other gives the direct pound per gallon-to-kilogram per cubic foot factor of 3.39310656.
Simple example
1 lb/gal × 3.39310656 = 3.39310656 kg/ft3
1 pound per gallon = 3.39310656 kilograms per cubic foot.
Real-world example
1,000 lb/gal × 3.39310656 = 3,393.10656 kg/ft3
1,000 pounds per gallon = 3,393.10656 kilograms per cubic foot.
Conversion table
| Pound per Gallon (lb/gal) | Kilogram per Cubic foot (kg/ft3) |
|---|---|
| 0.1 lb/gal | 0.339310656 kg/ft3 |
| 1 lb/gal | 3.39310656 kg/ft3 |
| 10 lb/gal | 33.9310656 kg/ft3 |
| 100 lb/gal | 339.310656 kg/ft3 |
| 1,000 lb/gal | 3,393.10656 kg/ft3 |
| 10,000 lb/gal | 33,931.0656 kg/ft3 |
Reverse conversion: Kilogram per Cubic foot to Pound per Gallon
3.39310656 kg/ft3 × 0.2947151769 = 1 lb/gal
3.39310656 kilograms per cubic foot = 1 pounds per gallon.
pounds per gallon = kilograms per cubic foot × 0.294715176879
For a page dedicated to this direction, see Kilogram per Cubic foot to Pound per Gallon.
Pound per Gallon vs. Kilogram per Cubic foot
| Aspect | Pound per Gallon | Kilogram per Cubic foot |
|---|---|---|
| Family | US customary density unit | mixed metric/US customary density unit |
| Typical use | US paint and coatings density specifications | Can be used to express the density of construction and bulk materials such as insulation, soil, or aggregate — in practice, pounds per cubic foot (US) or tons per cubic yard are the units more commonly seen in US construction references |
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 Kilogram per Cubic foot
Kilogram per Cubic foot (kg/ft3) measures density. A mathematically valid way to express density in kilograms per cubic foot. It is classified as a mixed metric/US customary density unit.
Uses of the Kilogram per Cubic foot today
- Can be used to express the density of construction and bulk materials such as insulation, soil, or aggregate — in practice, pounds per cubic foot (US) or tons per cubic yard are the units more commonly seen in US construction references
Pound per Gallon — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
Kilogram per Cubic foot — sources
- US construction and materials-estimating references — US construction density figures are typically given in pounds per cubic foot or tons per cubic yard rather than kilograms per cubic foot.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilograms per cubic foot are in 1 pound per gallon?
1 pound per gallon equals 3.39310656 kilograms per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert pound per gallon to kilogram per cubic foot?
Multiply the pound per gallon value by 3.39310656. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cubic foot back to pound per gallon?
Use the reverse factor: 1 kilogram per cubic foot equals 0.2947151769 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 kilogram per cubic foot?
Kilogram per Cubic foot (kg/ft3) measures density. A mathematically valid way to express density in kilograms per cubic foot. It is classified as a mixed metric/US customary density unit.
Is the pound per gallon to kilogram per cubic foot conversion exact?
Yes. Both pound per gallon and kilogram per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 3.39310656 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)