Mass per volume density.
Stones per Cup to Long tons per Cubic Millimeter Converter — st/cup to long ton/mm3
Convert Stone per Cup (st/cup) to Long ton per Cubic Millimeter (long ton/mm3) using the exact conversion factor (1 stone per cup = 2.641721e-8 long ton per cubic millimeter). See the formula, worked examples, and conversion table.
Stones per Cup 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 26841.11972 / 1.01604691e+12.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Cup to Long tons per Cubic Millimeter
Stone per Cup 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. Both are mass per volume density units.
Formula
long tons per cubic millimeter = stones per cup × 2.641721e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per cup equals 26841.119719 base units, and 1 long ton per cubic millimeter equals 1.016047e+12 base units, so dividing one by the other gives the direct stone per cup-to-long ton per cubic millimeter factor of 2.641721e-8.
Simple example
1 st/cup × 2.641721e-8 = 2.641721e-8 long ton/mm3
1 stone per cup = 2.641721e-8 long tons per cubic millimeter.
Real-world example
1,000 st/cup × 2.641721e-8 = 0.0000264172 long ton/mm3
1,000 stones per cup = 0.0000264172 long tons per cubic millimeter.
Conversion table
| Stone per Cup (st/cup) | Long ton per Cubic Millimeter (long ton/mm3) |
|---|---|
| 0.1 st/cup | 2.641721e-9 long ton/mm3 |
| 1 st/cup | 2.641721e-8 long ton/mm3 |
| 10 st/cup | 2.641721e-7 long ton/mm3 |
| 100 st/cup | 0.0000026417 long ton/mm3 |
| 1,000 st/cup | 0.0000264172 long ton/mm3 |
| 10,000 st/cup | 0.0002641721 long ton/mm3 |
Reverse conversion: Long ton per Cubic Millimeter to Stone per Cup
2.641721e-8 long ton/mm3 × 37854117.84 = 1.00000018 st/cup
2.641721e-8 long tons per cubic millimeter = 1.00000018 stones per cup.
stones per cup = long tons per cubic millimeter × 37854117.84
For a page dedicated to this direction, see Long ton per Cubic Millimeter to Stone per Cup.
Understanding the Stone per Cup (st/cup)
Mass per volume density.
Understanding the Long ton per Cubic Millimeter (long ton/mm3)
Mass per volume density.
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 stone per cup?
1 stone per cup equals 2.641721e-8 long tons per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert stone per cup to long ton per cubic millimeter?
Multiply the stone per cup value by 2.641721e-8. The converter above does this instantly to whatever precision you set.
How do I convert long ton per cubic millimeter back to stone per cup?
Use the reverse factor: 1 long ton per cubic millimeter equals 37,854,117.84 stones per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per cup?
Stone per Cup (st/cup) is a unit of density.
What is a long ton per cubic millimeter?
Long ton per Cubic Millimeter (long ton/mm3) is a unit of density.
Is the stone per cup to long ton per cubic millimeter conversion exact?
Yes. Both stone per cup and long ton per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 2.641721e-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.