Mass per volume density.
Long tons per Cubic yard to Pounds per Cubic Millimeter Converter — long ton/yd3 to lb/mm3
Convert Long ton per Cubic yard (long ton/yd3) to Pound per Cubic Millimeter (lb/mm3) using the exact conversion factor (1 long ton per cubic yard = 0.0000029298 pound per cubic millimeter). See the formula, worked examples, and conversion table.
Long tons per Cubic yard to Pounds 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 1328.939184 / 4.5359237e+8.
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 yard to Pounds per Cubic Millimeter
Long ton per Cubic yard and Pound 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
pounds per cubic millimeter = long tons per cubic yard × 0.00000292980938726
This factor comes from each unit's defined relationship to the category's base unit: 1 long ton per cubic yard equals 1328.93918362 base units, and 1 pound per cubic millimeter equals 453592370 base units, so dividing one by the other gives the direct long ton per cubic yard-to-pound per cubic millimeter factor of 0.00000292980938726.
Simple example
1 long ton/yd3 × 0.000002929809387 = 0.0000029298 lb/mm3
1 long ton per cubic yard = 0.0000029298 pounds per cubic millimeter.
Real-world example
1,000 long ton/yd3 × 0.000002929809387 = 0.0029298094 lb/mm3
1,000 long tons per cubic yard = 0.0029298094 pounds per cubic millimeter.
Conversion table
| Long ton per Cubic yard (long ton/yd3) | Pound per Cubic Millimeter (lb/mm3) |
|---|---|
| 0.1 long ton/yd3 | 2.929809e-7 lb/mm3 |
| 1 long ton/yd3 | 0.0000029298 lb/mm3 |
| 10 long ton/yd3 | 0.0000292981 lb/mm3 |
| 100 long ton/yd3 | 0.0002929809 lb/mm3 |
| 1,000 long ton/yd3 | 0.0029298094 lb/mm3 |
| 10,000 long ton/yd3 | 0.0292980939 lb/mm3 |
Reverse conversion: Pound per Cubic Millimeter to Long ton per Cubic yard
0.0000029298 lb/mm3 × 341319.133 = 0.9999967959 long ton/yd3
0.0000029298 pounds per cubic millimeter = 0.9999967959 long tons per cubic yard.
long tons per cubic yard = pounds per cubic millimeter × 341319.133029
For a page dedicated to this direction, see Pound per Cubic Millimeter to Long ton per Cubic yard.
Understanding the Long ton per Cubic yard (long ton/yd3)
Mass per volume density.
Understanding the Pound per Cubic Millimeter (lb/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cubic millimeter are in 1 long ton per cubic yard?
1 long ton per cubic yard equals 0.0000029298 pounds per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert long ton per cubic yard to pound per cubic millimeter?
Multiply the long ton per cubic yard value by 0.000002929809387. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic millimeter back to long ton per cubic yard?
Use the reverse factor: 1 pound per cubic millimeter equals 341,319.133 long tons per cubic yard. You can also use the swap control in the converter above to flip the direction instantly.
What is a long ton per cubic yard?
Long ton per Cubic yard (long ton/yd3) is a unit of density.
What is a pound per cubic millimeter?
Pound per Cubic Millimeter (lb/mm3) is a unit of density.
Is the long ton per cubic yard to pound per cubic millimeter conversion exact?
Yes. Both long ton per cubic yard and pound per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.000002929809387 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.