Mass per volume density.
Stones per Cubic foot to Kilograms per Cubic Millimeter Converter — st/ft3 to kg/mm3
Convert Stone per Cubic foot (st/ft3) to Kilogram per Cubic Millimeter (kg/mm3) using the exact conversion factor (1 stone per cubic foot = 2.242585e-7 kilogram per cubic millimeter). See the formula, worked examples, and conversion table.
Stones per Cubic foot to Kilograms 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 224.2584872 / 1e+9.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Cubic foot to Kilograms per Cubic Millimeter
Stone per Cubic foot and Kilogram 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
kilograms per cubic millimeter = stones per cubic foot × 2.242585e-7
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per cubic foot equals 224.258487235 base units, and 1 kilogram per cubic millimeter equals 1000000000 base units, so dividing one by the other gives the direct stone per cubic foot-to-kilogram per cubic millimeter factor of 2.242585e-7.
Simple example
1 st/ft3 × 2.242585e-7 = 2.242585e-7 kg/mm3
1 stone per cubic foot = 2.242585e-7 kilograms per cubic millimeter.
Real-world example
1,000 st/ft3 × 2.242585e-7 = 0.0002242585 kg/mm3
1,000 stones per cubic foot = 0.0002242585 kilograms per cubic millimeter.
Conversion table
| Stone per Cubic foot (st/ft3) | Kilogram per Cubic Millimeter (kg/mm3) |
|---|---|
| 0.1 st/ft3 | 2.242585e-8 kg/mm3 |
| 1 st/ft3 | 2.242585e-7 kg/mm3 |
| 10 st/ft3 | 0.0000022426 kg/mm3 |
| 100 st/ft3 | 0.0000224258 kg/mm3 |
| 1,000 st/ft3 | 0.0002242585 kg/mm3 |
| 10,000 st/ft3 | 0.0022425849 kg/mm3 |
Reverse conversion: Kilogram per Cubic Millimeter to Stone per Cubic foot
2.242585e-7 kg/mm3 × 4459140.041 = 1.000000057 st/ft3
2.242585e-7 kilograms per cubic millimeter = 1.000000057 stones per cubic foot.
stones per cubic foot = kilograms per cubic millimeter × 4459140.04115
For a page dedicated to this direction, see Kilogram per Cubic Millimeter to Stone per Cubic foot.
Understanding the Stone per Cubic foot (st/ft3)
Mass per volume density.
Understanding the Kilogram per Cubic Millimeter (kg/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilograms per cubic millimeter are in 1 stone per cubic foot?
1 stone per cubic foot equals 2.242585e-7 kilograms per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert stone per cubic foot to kilogram per cubic millimeter?
Multiply the stone per cubic foot value by 2.242585e-7. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cubic millimeter back to stone per cubic foot?
Use the reverse factor: 1 kilogram per cubic millimeter equals 4,459,140.041 stones per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per cubic foot?
Stone per Cubic foot (st/ft3) is a unit of density.
What is a kilogram per cubic millimeter?
Kilogram per Cubic Millimeter (kg/mm3) is a unit of density.
Is the stone per cubic foot to kilogram per cubic millimeter conversion exact?
Yes. Both stone per cubic foot and kilogram per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 2.242585e-7 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.