Mass per volume density.
Long tons per Cubic Millimeter to Pounds per Cubic foot Converter — long ton/mm3 to lb/ft3
Convert Long ton per Cubic Millimeter (long ton/mm3) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 long ton per cubic millimeter = 63,429,736,370 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Long tons per Cubic Millimeter 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 1.01604691e+12 / 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 Cubic Millimeter to Pounds per Cubic foot
Long ton per Cubic Millimeter 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 cubic millimeter × 63429736366.1
This factor comes from each unit's defined relationship to the category's base unit: 1 long ton per cubic millimeter equals 1.016047e+12 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 cubic millimeter-to-pound per cubic foot factor of 63429736366.1.
Simple example
1 long ton/mm3 × 63429736370 = 63,429,736,370 lb/ft3
1 long ton per cubic millimeter = 63,429,736,370 pounds per cubic foot.
Real-world example
1,000 long ton/mm3 × 63429736370 = 6.342974e+13 lb/ft3
1,000 long tons per cubic millimeter = 6.342974e+13 pounds per cubic foot.
Conversion table
| Long ton per Cubic Millimeter (long ton/mm3) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 long ton/mm3 | 6,342,973,637 lb/ft3 |
| 1 long ton/mm3 | 63,429,736,370 lb/ft3 |
| 10 long ton/mm3 | 634,297,363,700 lb/ft3 |
| 100 long ton/mm3 | 6.342974e+12 lb/ft3 |
| 1,000 long ton/mm3 | 6.342974e+13 lb/ft3 |
| 10,000 long ton/mm3 | 6.342974e+14 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Long ton per Cubic Millimeter
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.
long tons per cubic millimeter = pounds per cubic foot × 1.576548e-11
For a page dedicated to this direction, see Pound per Cubic foot to Long ton per Cubic Millimeter.
Understanding the Long ton per Cubic Millimeter (long ton/mm3)
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 cubic millimeter?
1 long ton per cubic millimeter equals 63,429,736,370 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert long ton per cubic millimeter to pound per cubic foot?
Multiply the long ton per cubic millimeter value by 63429736370. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to long ton per cubic millimeter?
Use the reverse factor: 1 pound per cubic foot equals 1.576548e-11 long tons per cubic millimeter. You can also use the swap control in the converter above to flip the direction instantly.
What is a long ton per cubic millimeter?
Long ton per Cubic Millimeter (long ton/mm3) 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 cubic millimeter to pound per cubic foot conversion exact?
Yes. Both long ton per cubic millimeter and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 63429736370 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.