Mass per volume density.
Kilograms per Cup to Pounds per Cubic foot Converter — kg/cup to lb/ft3
Convert Kilogram per Cup (kg/cup) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 kilogram per cup = 263.8675595 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Kilograms 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 4226.752838 / 16.01846337.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilograms per Cup to Pounds per Cubic foot
Kilogram 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 = kilograms per cup × 263.867559519
This factor comes from each unit's defined relationship to the category's base unit: 1 kilogram per cup equals 4226.75283773 base units, and 1 pound per cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct kilogram per cup-to-pound per cubic foot factor of 263.867559519.
Simple example
1 kg/cup × 263.8675595 = 263.8675595 lb/ft3
1 kilogram per cup = 263.8675595 pounds per cubic foot.
Real-world example
1,000 kg/cup × 263.8675595 = 263,867.5595 lb/ft3
1,000 kilograms per cup = 263,867.5595 pounds per cubic foot.
Conversion table
| Kilogram per Cup (kg/cup) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 kg/cup | 26.38675595 lb/ft3 |
| 1 kg/cup | 263.8675595 lb/ft3 |
| 10 kg/cup | 2,638.675595 lb/ft3 |
| 100 kg/cup | 26,386.75595 lb/ft3 |
| 1,000 kg/cup | 263,867.5595 lb/ft3 |
| 10,000 kg/cup | 2,638,675.595 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Kilogram per Cup
263.8675595 lb/ft3 × 0.003789780001 = 0.9999999999 kg/cup
263.8675595 pounds per cubic foot = 0.9999999999 kilograms per cup.
kilograms per cup = pounds per cubic foot × 0.00378978000109
For a page dedicated to this direction, see Pound per Cubic foot to Kilogram per Cup.
Understanding the Kilogram per Cup (kg/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 kilogram per cup?
1 kilogram per cup equals 263.8675595 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert kilogram per cup to pound per cubic foot?
Multiply the kilogram per cup value by 263.8675595. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to kilogram per cup?
Use the reverse factor: 1 pound per cubic foot equals 0.00378978 kilograms per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilogram per cup?
Kilogram per Cup (kg/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 kilogram per cup to pound per cubic foot conversion exact?
Yes. Both kilogram per cup and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 263.8675595 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.