Mass per volume density.
Grams per Cup to Pounds per Cubic foot Converter — g/cup to lb/ft3
Convert Gram per Cup (g/cup) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 gram per cup = 0.2638675595 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Grams per Cup 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 4.226752838 / 16.01846337.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grams per Cup to Pounds per Cubic foot
Gram per Cup 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 = grams per cup × 0.263867559519
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per cup equals 4.22675283773 base units, and 1 pound per cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct gram per cup-to-pound per cubic foot factor of 0.263867559519.
Simple example
1 g/cup × 0.2638675595 = 0.2638675595 lb/ft3
1 gram per cup = 0.2638675595 pounds per cubic foot.
Real-world example
1,000 g/cup × 0.2638675595 = 263.8675595 lb/ft3
1,000 grams per cup = 263.8675595 pounds per cubic foot.
Conversion table
| Gram per Cup (g/cup) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 g/cup | 0.026386756 lb/ft3 |
| 1 g/cup | 0.2638675595 lb/ft3 |
| 10 g/cup | 2.638675595 lb/ft3 |
| 100 g/cup | 26.38675595 lb/ft3 |
| 1,000 g/cup | 263.8675595 lb/ft3 |
| 10,000 g/cup | 2,638.675595 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Gram per Cup
0.2638675595 lb/ft3 × 3.789780001 = 0.9999999999 g/cup
0.2638675595 pounds per cubic foot = 0.9999999999 grams per cup.
grams per cup = pounds per cubic foot × 3.78978000109
For a page dedicated to this direction, see Pound per Cubic foot to Gram per Cup.
Understanding the Gram per Cup (g/cup)
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 cup?
1 gram per cup equals 0.2638675595 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert gram per cup to pound per cubic foot?
Multiply the gram per cup value by 0.2638675595. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to gram per cup?
Use the reverse factor: 1 pound per cubic foot equals 3.789780001 grams per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per cup?
Gram per Cup (g/cup) 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 cup to pound per cubic foot conversion exact?
Yes. Both gram per cup and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 0.2638675595 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.