Mass per volume density.
Long tons per Cubic foot to Short tons per Cubic Millimeter Converter — long ton/ft3 to ton/mm3
Convert Long ton per Cubic foot (long ton/ft3) to Short ton per Cubic Millimeter (ton/mm3) using the exact conversion factor (1 long ton per cubic foot = 3.955243e-8 short ton per cubic millimeter). See the formula, worked examples, and conversion table.
Long tons per Cubic foot to Short 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 35881.35796 / 9.0718474e+11.
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 foot to Short tons per Cubic Millimeter
Long ton per Cubic foot and Short 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. Both are mass per volume density units.
Formula
short tons per cubic millimeter = long tons per cubic foot × 3.955243e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 long ton per cubic foot equals 35881.3579577 base units, and 1 short ton per cubic millimeter equals 907184740000 base units, so dividing one by the other gives the direct long ton per cubic foot-to-short ton per cubic millimeter factor of 3.955243e-8.
Simple example
1 long ton/ft3 × 3.955243e-8 = 3.955243e-8 ton/mm3
1 long ton per cubic foot = 3.955243e-8 short tons per cubic millimeter.
Real-world example
1,000 long ton/ft3 × 3.955243e-8 = 0.0000395524 ton/mm3
1,000 long tons per cubic foot = 0.0000395524 short tons per cubic millimeter.
Conversion table
| Long ton per Cubic foot (long ton/ft3) | Short ton per Cubic Millimeter (ton/mm3) |
|---|---|
| 0.1 long ton/ft3 | 3.955243e-9 ton/mm3 |
| 1 long ton/ft3 | 3.955243e-8 ton/mm3 |
| 10 long ton/ft3 | 3.955243e-7 ton/mm3 |
| 100 long ton/ft3 | 0.0000039552 ton/mm3 |
| 1,000 long ton/ft3 | 0.0000395524 ton/mm3 |
| 10,000 long ton/ft3 | 0.0003955243 ton/mm3 |
Reverse conversion: Short ton per Cubic Millimeter to Long ton per Cubic foot
3.955243e-8 ton/mm3 × 25282898.74 = 1.000000083 long ton/ft3
3.955243e-8 short tons per cubic millimeter = 1.000000083 long tons per cubic foot.
long tons per cubic foot = short tons per cubic millimeter × 25282898.7429
For a page dedicated to this direction, see Short ton per Cubic Millimeter to Long ton per Cubic foot.
Understanding the Long ton per Cubic foot (long ton/ft3)
Mass per volume density.
Understanding the Short ton per Cubic Millimeter (ton/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many short tons per cubic millimeter are in 1 long ton per cubic foot?
1 long ton per cubic foot equals 3.955243e-8 short tons per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert long ton per cubic foot to short ton per cubic millimeter?
Multiply the long ton per cubic foot value by 3.955243e-8. The converter above does this instantly to whatever precision you set.
How do I convert short ton per cubic millimeter back to long ton per cubic foot?
Use the reverse factor: 1 short ton per cubic millimeter equals 25,282,898.74 long tons per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
What is a long ton per cubic foot?
Long ton per Cubic foot (long ton/ft3) is a unit of density.
What is a short ton per cubic millimeter?
Short ton per Cubic Millimeter (ton/mm3) is a unit of density.
Is the long ton per cubic foot to short ton per cubic millimeter conversion exact?
Yes. Both long ton per cubic foot and short ton per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 3.955243e-8 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.