Mass per volume density.
Long tons per Cup to Pounds per Cubic foot Converter — long ton/cup to lb/ft3
Convert Long ton per Cup (long ton/cup) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 long ton per cup = 268,101.8182 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Long tons 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 4.29457916e+6 / 16.01846337.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Long tons per Cup to Pounds per Cubic foot
Long ton 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 = long tons per cup × 268101.818182
This factor comes from each unit's defined relationship to the category's base unit: 1 long ton per cup equals 4294579.15504 base units, and 1 pound per cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct long ton per cup-to-pound per cubic foot factor of 268101.818182.
Simple example
1 long ton/cup × 268101.8182 = 268,101.8182 lb/ft3
1 long ton per cup = 268,101.8182 pounds per cubic foot.
Real-world example
1,000 long ton/cup × 268101.8182 = 268,101,818.2 lb/ft3
1,000 long tons per cup = 268,101,818.2 pounds per cubic foot.
Conversion table
| Long ton per Cup (long ton/cup) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 long ton/cup | 26,810.18182 lb/ft3 |
| 1 long ton/cup | 268,101.8182 lb/ft3 |
| 10 long ton/cup | 2,681,018.182 lb/ft3 |
| 100 long ton/cup | 26,810,181.82 lb/ft3 |
| 1,000 long ton/cup | 268,101,818.2 lb/ft3 |
| 10,000 long ton/cup | 2,681,018,182 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Long ton per Cup
1 lb/ft3 × 0.000003729926215 = 0.0000037299 long ton/cup
1 pound per cubic foot = 0.0000037299 long tons per cup.
long tons per cup = pounds per cubic foot × 0.00000372992621528
For a page dedicated to this direction, see Pound per Cubic foot to Long ton per Cup.
Understanding the Long ton per Cup (long ton/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 long ton per cup?
1 long ton per cup equals 268,101.8182 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert long ton per cup to pound per cubic foot?
Multiply the long ton per cup value by 268101.8182. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to long ton per cup?
Use the reverse factor: 1 pound per cubic foot equals 0.0000037299 long tons per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a long ton per cup?
Long ton per Cup (long ton/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 long ton per cup to pound per cubic foot conversion exact?
Yes. Both long ton per cup and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 268101.8182 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.