Mass per volume density.
Pounds per Cubic foot to Kilograms per Cubic foot Converter — lb/ft3 to kg/ft3
Convert Pound per Cubic foot (lb/ft3) to Kilogram per Cubic foot (kg/ft3) using the exact conversion factor (1 pound per cubic foot = 0.45359237 kilogram per cubic foot). See the formula, worked examples, conversion table, unit comparison, and common uses.
Pounds per Cubic foot 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 16.01846337 / 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 Cubic foot to Kilograms per Cubic foot
Pound per Cubic foot 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 Cubic foot is most often used for us construction material density specs (concrete, soil, lumber, insulation).
Formula
kilograms per cubic foot = pounds per cubic foot × 0.45359237
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic foot equals 16.018463374 base units, and 1 kilogram per cubic foot equals 35.3146667215 base units, so dividing one by the other gives the direct pound per cubic foot-to-kilogram per cubic foot factor of 0.45359237.
Simple example
1 lb/ft3 × 0.45359237 = 0.45359237 kg/ft3
1 pound per cubic foot = 0.45359237 kilograms per cubic foot.
Real-world example
1,000 lb/ft3 × 0.45359237 = 453.59237 kg/ft3
1,000 pounds per cubic foot = 453.59237 kilograms per cubic foot.
Conversion table
| Pound per Cubic foot (lb/ft3) | Kilogram per Cubic foot (kg/ft3) |
|---|---|
| 0.1 lb/ft3 | 0.045359237 kg/ft3 |
| 1 lb/ft3 | 0.45359237 kg/ft3 |
| 10 lb/ft3 | 4.5359237 kg/ft3 |
| 100 lb/ft3 | 45.359237 kg/ft3 |
| 1,000 lb/ft3 | 453.59237 kg/ft3 |
| 10,000 lb/ft3 | 4,535.9237 kg/ft3 |
Reverse conversion: Kilogram per Cubic foot to Pound per Cubic foot
0.45359237 kg/ft3 × 2.204622622 = 1 lb/ft3
0.45359237 kilograms per cubic foot = 1 pound per cubic foot.
pounds per cubic foot = kilograms per cubic foot × 2.20462262185
For a page dedicated to this direction, see Kilogram per Cubic foot to Pound per Cubic foot.
Pound per Cubic foot vs. Kilogram per Cubic foot
| Aspect | Pound per Cubic foot | Kilogram per Cubic foot |
|---|---|---|
| Family | US customary density unit | mixed metric/US customary density unit |
| Typical use | US construction material density specs (concrete, soil, lumber, insulation) | 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 Cubic foot
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. It is classified as a US customary density unit.
Where it's used: United States (construction, engineering, materials specifications)
Uses of the Pound per Cubic foot today
- US construction material density specs (concrete, soil, lumber, insulation)
- US engineering material property tables
- Bulk material handling and shipping weight estimates
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 Cubic foot — 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 cubic foot?
1 pound per cubic foot equals 0.45359237 kilograms per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic foot to kilogram per cubic foot?
Multiply the pound per cubic foot value by 0.45359237. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cubic foot back to pound per cubic foot?
Use the reverse factor: 1 kilogram per cubic foot equals 2.204622622 pounds per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cubic foot?
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. 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 cubic foot to kilogram per cubic foot conversion exact?
Yes. Both pound per cubic foot and kilogram per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 0.45359237 used above is exact to as many digits as you choose to display.
Where is the pound per cubic foot still used today?
United States (construction, engineering, materials specifications)
What's the difference between density and mass concentration?
Density is the mass of a pure substance or material per unit volume. Mass concentration is the mass of one component — like a dissolved solute — within a mixture's total volume. The two use the same kind of units but describe different physical situations.