Mass per volume density.
Pound per Cubic inches to Kilograms per Cubic foot Converter — lb/in3 to kg/ft3
Convert Pound per Cubic inch (lb/in3) to Kilogram per Cubic foot (kg/ft3) using the exact conversion factor (1 pound per cubic inch = 783.8076154 kilogram per cubic foot). See the formula, worked examples, conversion table, unit comparison, and common uses.
Pound per Cubic inches 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 27679.90471 / 35.31466672.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pound per Cubic inches to Kilograms per Cubic foot
Pound per Cubic inch 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 inch is most often used for used in machining and materials engineering, particularly for describing the density of metals, where a smaller volume unit than the cubic foot gives a more convenient figure.
Formula
kilograms per cubic foot = pound per cubic inches × 783.80761536
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic inch equals 27679.9047102 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 inch-to-kilogram per cubic foot factor of 783.80761536.
Simple example
1 lb/in3 × 783.8076154 = 783.8076154 kg/ft3
1 pound per cubic inch = 783.8076154 kilograms per cubic foot.
Real-world example
1,000 lb/in3 × 783.8076154 = 783,807.6154 kg/ft3
1,000 pound per cubic inches = 783,807.6154 kilograms per cubic foot.
Conversion table
| Pound per Cubic inch (lb/in3) | Kilogram per Cubic foot (kg/ft3) |
|---|---|
| 0.1 lb/in3 | 78.38076154 kg/ft3 |
| 1 lb/in3 | 783.8076154 kg/ft3 |
| 10 lb/in3 | 7,838.076154 kg/ft3 |
| 100 lb/in3 | 78,380.76154 kg/ft3 |
| 1,000 lb/in3 | 783,807.6154 kg/ft3 |
| 10,000 lb/in3 | 7,838,076.154 kg/ft3 |
Reverse conversion: Kilogram per Cubic foot to Pound per Cubic inch
783.8076154 kg/ft3 × 0.001275823277 = 1 lb/in3
783.8076154 kilograms per cubic foot = 1 pound per cubic inches.
pound per cubic inches = kilograms per cubic foot × 0.00127582327653
For a page dedicated to this direction, see Kilogram per Cubic foot to Pound per Cubic inch.
Pound per Cubic inch vs. Kilogram per Cubic foot
| Aspect | Pound per Cubic inch | Kilogram per Cubic foot |
|---|---|---|
| Family | US customary density unit | mixed metric/US customary density unit |
| Typical use | Used in machining and materials engineering, particularly for describing the density of metals, where a smaller volume unit than the cubic foot gives a more convenient figure | 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 inch
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. It is classified as a US customary density unit.
Where it's used: United States
Uses of the Pound per Cubic inch today
- Used in machining and materials engineering, particularly for describing the density of metals, where a smaller volume unit than the cubic foot gives a more convenient figure
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 inch — sources
- US materials-engineering reference tables — Pounds per cubic inch is a commonly tabulated density unit for metals in US machining and materials references.
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 inch?
1 pound per cubic inch equals 783.8076154 kilograms per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic inch to kilogram per cubic foot?
Multiply the pound per cubic inch value by 783.8076154. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cubic foot back to pound per cubic inch?
Use the reverse factor: 1 kilogram per cubic foot equals 0.0012758233 pound per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cubic inch?
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. 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 inch to kilogram per cubic foot conversion exact?
Yes. Both pound per cubic inch and kilogram per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 783.8076154 used above is exact to as many digits as you choose to display.
Where is the pound per cubic inch still used today?
United States
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.