Mass per volume density.
Gram per Cubic inches to Pounds per Cubic foot Converter — g/in3 to lb/ft3
Convert Gram per Cubic inch (g/in3) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 gram per cubic inch = 3.809587891 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Gram per Cubic inches to Pounds 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 61.02374409 / 16.01846337.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gram per Cubic inches to Pounds per Cubic foot
Gram per Cubic inch and Pound 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. Both are mass per volume density units.
Formula
pounds per cubic foot = gram per cubic inches × 3.80958789055
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per cubic inch equals 61.0237440947 base units, and 1 pound per cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct gram per cubic inch-to-pound per cubic foot factor of 3.80958789055.
Simple example
1 g/in3 × 3.809587891 = 3.809587891 lb/ft3
1 gram per cubic inch = 3.809587891 pounds per cubic foot.
Real-world example
1,000 g/in3 × 3.809587891 = 3,809.587891 lb/ft3
1,000 gram per cubic inches = 3,809.587891 pounds per cubic foot.
Conversion table
| Gram per Cubic inch (g/in3) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 g/in3 | 0.3809587891 lb/ft3 |
| 1 g/in3 | 3.809587891 lb/ft3 |
| 10 g/in3 | 38.09587891 lb/ft3 |
| 100 g/in3 | 380.9587891 lb/ft3 |
| 1,000 g/in3 | 3,809.587891 lb/ft3 |
| 10,000 g/in3 | 38,095.87891 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Gram per Cubic inch
3.809587891 lb/ft3 × 0.2624955845 = 1 g/in3
3.809587891 pounds per cubic foot = 1 gram per cubic inches.
gram per cubic inches = pounds per cubic foot × 0.262495584491
For a page dedicated to this direction, see Pound per Cubic foot to Gram per Cubic inch.
Understanding the Gram per Cubic inch (g/in3)
Mass per volume density.
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
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 pounds per cubic foot are in 1 gram per cubic inch?
1 gram per cubic inch equals 3.809587891 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert gram per cubic inch to pound per cubic foot?
Multiply the gram per cubic inch value by 3.809587891. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to gram per cubic inch?
Use the reverse factor: 1 pound per cubic foot equals 0.2624955845 gram per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per cubic inch?
Gram per Cubic inch (g/in3) is a unit of density.
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.
Is the gram per cubic inch to pound per cubic foot conversion exact?
Yes. Both gram per cubic inch and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 3.809587891 used above is exact to as many digits as you choose to display.
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.