Mass per volume density.
Pounds per Cubic foot to Kilogram per Cubic inches Converter — lb/ft3 to kg/in3
Convert Pound per Cubic foot (lb/ft3) to Kilogram per Cubic inch (kg/in3) using the exact conversion factor (1 pound per cubic foot = 0.0002624956 kilogram per cubic inch). See the formula, worked examples, conversion table, and common uses.
Pounds per Cubic foot to Kilogram per Cubic inches 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 / 61023.74409.
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 Kilogram per Cubic inches
Pound per Cubic foot and Kilogram per Cubic inch 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
kilogram per cubic inches = pounds per cubic foot × 0.000262495584491
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 inch equals 61023.7440947 base units, so dividing one by the other gives the direct pound per cubic foot-to-kilogram per cubic inch factor of 0.000262495584491.
Simple example
1 lb/ft3 × 0.0002624955845 = 0.0002624956 kg/in3
1 pound per cubic foot = 0.0002624956 kilogram per cubic inches.
Real-world example
1,000 lb/ft3 × 0.0002624955845 = 0.2624955845 kg/in3
1,000 pounds per cubic foot = 0.2624955845 kilogram per cubic inches.
Conversion table
| Pound per Cubic foot (lb/ft3) | Kilogram per Cubic inch (kg/in3) |
|---|---|
| 0.1 lb/ft3 | 0.0000262496 kg/in3 |
| 1 lb/ft3 | 0.0002624956 kg/in3 |
| 10 lb/ft3 | 0.0026249558 kg/in3 |
| 100 lb/ft3 | 0.0262495585 kg/in3 |
| 1,000 lb/ft3 | 0.2624955845 kg/in3 |
| 10,000 lb/ft3 | 2.624955845 kg/in3 |
Reverse conversion: Kilogram per Cubic inch to Pound per Cubic foot
0.0002624956 kg/in3 × 3809.587891 = 1.000000059 lb/ft3
0.0002624956 kilogram per cubic inches = 1.000000059 pounds per cubic foot.
pounds per cubic foot = kilogram per cubic inches × 3809.58789055
For a page dedicated to this direction, see Kilogram per Cubic inch to Pound per Cubic foot.
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 inch (kg/in3)
Mass per volume density.
Pound per Cubic foot — 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 kilogram per cubic inches are in 1 pound per cubic foot?
1 pound per cubic foot equals 0.0002624956 kilogram per cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic foot to kilogram per cubic inch?
Multiply the pound per cubic foot value by 0.0002624955845. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cubic inch back to pound per cubic foot?
Use the reverse factor: 1 kilogram per cubic inch equals 3,809.587891 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 inch?
Kilogram per Cubic inch (kg/in3) is a unit of density.
Is the pound per cubic foot to kilogram per cubic inch conversion exact?
Yes. Both pound per cubic foot and kilogram per cubic inch are defined by fixed standards rather than physical artifacts, so the factor of 0.0002624955845 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.