Mass per volume density.
Pounds per Cup to Pounds per Cubic foot Converter — lb/cup to lb/ft3
Convert Pound per Cup (lb/cup) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 pound per cup = 119.6883117 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Pounds 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 1917.222837 / 16.01846337.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Cup to Pounds per Cubic foot
Pound 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 = pounds per cup × 119.688311688
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cup equals 1917.22283707 base units, and 1 pound per cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct pound per cup-to-pound per cubic foot factor of 119.688311688.
Simple example
1 lb/cup × 119.6883117 = 119.6883117 lb/ft3
1 pound per cup = 119.6883117 pounds per cubic foot.
Real-world example
1,000 lb/cup × 119.6883117 = 119,688.3117 lb/ft3
1,000 pounds per cup = 119,688.3117 pounds per cubic foot.
Conversion table
| Pound per Cup (lb/cup) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 lb/cup | 11.96883117 lb/ft3 |
| 1 lb/cup | 119.6883117 lb/ft3 |
| 10 lb/cup | 1,196.883117 lb/ft3 |
| 100 lb/cup | 11,968.83117 lb/ft3 |
| 1,000 lb/cup | 119,688.3117 lb/ft3 |
| 10,000 lb/cup | 1,196,883.117 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Pound per Cup
119.6883117 lb/ft3 × 0.008355034722 = 1 lb/cup
119.6883117 pounds per cubic foot = 1 pounds per cup.
pounds per cup = pounds per cubic foot × 0.00835503472222
For a page dedicated to this direction, see Pound per Cubic foot to Pound per Cup.
Understanding the Pound per Cup (lb/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 pound per cup?
1 pound per cup equals 119.6883117 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cup to pound per cubic foot?
Multiply the pound per cup value by 119.6883117. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to pound per cup?
Use the reverse factor: 1 pound per cubic foot equals 0.0083550347 pounds per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cup?
Pound per Cup (lb/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 pound per cup to pound per cubic foot conversion exact?
Yes. Both pound per cup and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 119.6883117 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.