Mass per volume density.
Pounds per Cubic foot to Long tons per Cubic Millimeter Converter — lb/ft3 to long ton/mm3
Convert Pound per Cubic foot (lb/ft3) to Long ton per Cubic Millimeter (long ton/mm3) using the exact conversion factor (1 pound per cubic foot = 1.576548e-11 long ton per cubic millimeter). See the formula, worked examples, conversion table, and common uses.
Pounds per Cubic foot to Long tons per Cubic Millimeter 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 16.01846337 / 1.01604691e+12.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Cubic foot to Long tons per Cubic Millimeter
Pound per Cubic foot and Long ton per Cubic Millimeter 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. Pound per Cubic foot is most often used for us construction material density specs (concrete, soil, lumber, insulation).
Formula
long tons per cubic millimeter = pounds per cubic foot × 1.576548e-11
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic foot equals 16.018463374 base units, and 1 long ton per cubic millimeter equals 1.016047e+12 base units, so dividing one by the other gives the direct pound per cubic foot-to-long ton per cubic millimeter factor of 1.576548e-11.
Simple example
1 lb/ft3 × 1.576548e-11 = 1.576548e-11 long ton/mm3
1 pound per cubic foot = 1.576548e-11 long tons per cubic millimeter.
Real-world example
1,000 lb/ft3 × 1.576548e-11 = 1.576548e-8 long ton/mm3
1,000 pounds per cubic foot = 1.576548e-8 long tons per cubic millimeter.
Conversion table
| Pound per Cubic foot (lb/ft3) | Long ton per Cubic Millimeter (long ton/mm3) |
|---|---|
| 0.1 lb/ft3 | 1.576548e-12 long ton/mm3 |
| 1 lb/ft3 | 1.576548e-11 long ton/mm3 |
| 10 lb/ft3 | 1.576548e-10 long ton/mm3 |
| 100 lb/ft3 | 1.576548e-9 long ton/mm3 |
| 1,000 lb/ft3 | 1.576548e-8 long ton/mm3 |
| 10,000 lb/ft3 | 1.576548e-7 long ton/mm3 |
Reverse conversion: Long ton per Cubic Millimeter to Pound per Cubic foot
1.576548e-11 long ton/mm3 × 63429736370 = 1.00000024 lb/ft3
1.576548e-11 long tons per cubic millimeter = 1.00000024 pounds per cubic foot.
pounds per cubic foot = long tons per cubic millimeter × 63429736366.1
For a page dedicated to this direction, see Long ton per Cubic Millimeter to Pound per Cubic foot.
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
Understanding the Long ton per Cubic Millimeter (long ton/mm3)
Mass per volume density.
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 long tons per cubic millimeter are in 1 pound per cubic foot?
1 pound per cubic foot equals 1.576548e-11 long tons per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic foot to long ton per cubic millimeter?
Multiply the pound per cubic foot value by 1.576548e-11. The converter above does this instantly to whatever precision you set.
How do I convert long ton per cubic millimeter back to pound per cubic foot?
Use the reverse factor: 1 long ton per cubic millimeter equals 63,429,736,370 pounds per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a long ton per cubic millimeter?
Long ton per Cubic Millimeter (long ton/mm3) is a unit of density.
Is the pound per cubic foot to long ton per cubic millimeter conversion exact?
Yes. Both pound per cubic foot and long ton per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 1.576548e-11 used above is exact to as many digits as you choose to display.
Where is the pound per cubic foot still used today?
United States (construction, engineering, materials specifications)
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.