Mass per volume density.
Stones per Gallon to Carats per Cubic Millimeter Converter — st/gal to ct/mm3
Convert Stone per Gallon (st/gal) to Carat per Cubic Millimeter (ct/mm3) using the exact conversion factor (1 stone per gallon = 0.0083878499 carat per cubic millimeter). See the formula, worked examples, and conversion table.
Stones per Gallon 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 1677.569982 / 200000.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Gallon to Carats per Cubic Millimeter
Stone per Gallon 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 gallon × 0.00838784991218
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per gallon equals 1677.56998244 base units, and 1 carat per cubic millimeter equals 200000 base units, so dividing one by the other gives the direct stone per gallon-to-carat per cubic millimeter factor of 0.00838784991218.
Simple example
1 st/gal × 0.008387849912 = 0.0083878499 ct/mm3
1 stone per gallon = 0.0083878499 carats per cubic millimeter.
Real-world example
1,000 st/gal × 0.008387849912 = 8.387849912 ct/mm3
1,000 stones per gallon = 8.387849912 carats per cubic millimeter.
Conversion table
| Stone per Gallon (st/gal) | Carat per Cubic Millimeter (ct/mm3) |
|---|---|
| 0.1 st/gal | 0.000838785 ct/mm3 |
| 1 st/gal | 0.0083878499 ct/mm3 |
| 10 st/gal | 0.0838784991 ct/mm3 |
| 100 st/gal | 0.8387849912 ct/mm3 |
| 1,000 st/gal | 8.387849912 ct/mm3 |
| 10,000 st/gal | 83.87849912 ct/mm3 |
Reverse conversion: Carat per Cubic Millimeter to Stone per Gallon
0.0083878499 ct/mm3 × 119.2200636 = 0.9999999985 st/gal
0.0083878499 carats per cubic millimeter = 0.9999999985 stones per gallon.
stones per gallon = carats per cubic millimeter × 119.2200636
For a page dedicated to this direction, see Carat per Cubic Millimeter to Stone per Gallon.
Understanding the Stone per Gallon (st/gal)
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 gallon?
1 stone per gallon equals 0.0083878499 carats per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert stone per gallon to carat per cubic millimeter?
Multiply the stone per gallon value by 0.008387849912. The converter above does this instantly to whatever precision you set.
How do I convert carat per cubic millimeter back to stone per gallon?
Use the reverse factor: 1 carat per cubic millimeter equals 119.2200636 stones per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per gallon?
Stone per Gallon (st/gal) 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 gallon to carat per cubic millimeter conversion exact?
Yes. Both stone per gallon and carat per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.008387849912 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.