Mass per volume density.
Stones per Milliliter to Carats per Cubic Millimeter Converter — st/mL to ct/mm3
Convert Stone per Milliliter (st/mL) to Carat per Cubic Millimeter (ct/mm3) using the exact conversion factor (1 stone per milliliter = 31.7514659 carat per cubic millimeter). See the formula, worked examples, and conversion table.
Stones per Milliliter to Carats 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 6.35029318e+6 / 200000.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Milliliter to Carats per Cubic Millimeter
Stone per Milliliter and Carat 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
carats per cubic millimeter = stones per milliliter × 31.7514659
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per milliliter equals 6350293.18 base units, and 1 carat per cubic millimeter equals 200000 base units, so dividing one by the other gives the direct stone per milliliter-to-carat per cubic millimeter factor of 31.7514659.
Simple example
1 st/mL × 31.7514659 = 31.7514659 ct/mm3
1 stone per milliliter = 31.7514659 carats per cubic millimeter.
Real-world example
1,000 st/mL × 31.7514659 = 31,751.4659 ct/mm3
1,000 stones per milliliter = 31,751.4659 carats per cubic millimeter.
Conversion table
| Stone per Milliliter (st/mL) | Carat per Cubic Millimeter (ct/mm3) |
|---|---|
| 0.1 st/mL | 3.17514659 ct/mm3 |
| 1 st/mL | 31.7514659 ct/mm3 |
| 10 st/mL | 317.514659 ct/mm3 |
| 100 st/mL | 3,175.14659 ct/mm3 |
| 1,000 st/mL | 31,751.4659 ct/mm3 |
| 10,000 st/mL | 317,514.659 ct/mm3 |
Reverse conversion: Carat per Cubic Millimeter to Stone per Milliliter
31.7514659 ct/mm3 × 0.03149460888 = 1 st/mL
31.7514659 carats per cubic millimeter = 1 stones per milliliter.
stones per milliliter = carats per cubic millimeter × 0.0314946088836
For a page dedicated to this direction, see Carat per Cubic Millimeter to Stone per Milliliter.
Understanding the Stone per Milliliter (st/mL)
Mass per volume density.
Understanding the Carat per Cubic Millimeter (ct/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many carats per cubic millimeter are in 1 stone per milliliter?
1 stone per milliliter equals 31.7514659 carats per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert stone per milliliter to carat per cubic millimeter?
Multiply the stone per milliliter value by 31.7514659. The converter above does this instantly to whatever precision you set.
How do I convert carat per cubic millimeter back to stone per milliliter?
Use the reverse factor: 1 carat per cubic millimeter equals 0.0314946089 stones per milliliter. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per milliliter?
Stone per Milliliter (st/mL) is a unit of density.
What is a carat per cubic millimeter?
Carat per Cubic Millimeter (ct/mm3) is a unit of density.
Is the stone per milliliter to carat per cubic millimeter conversion exact?
Yes. Both stone per milliliter and carat per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 31.7514659 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.