Mass per volume density.
Grains per Milliliter to Carats per Cubic Millimeter Converter — gr/mL to ct/mm3
Convert Grain per Milliliter (gr/mL) to Carat per Cubic Millimeter (ct/mm3) using the exact conversion factor (1 grain per milliliter = 0.0003239946 carat per cubic millimeter). See the formula, worked examples, and conversion table.
Grains 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 64.79891 / 200000.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Milliliter to Carats per Cubic Millimeter
Grain 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 = grains per milliliter × 0.00032399455
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per milliliter equals 64.79891 base units, and 1 carat per cubic millimeter equals 200000 base units, so dividing one by the other gives the direct grain per milliliter-to-carat per cubic millimeter factor of 0.00032399455.
Simple example
1 gr/mL × 0.00032399455 = 0.0003239946 ct/mm3
1 grain per milliliter = 0.0003239946 carats per cubic millimeter.
Real-world example
1,000 gr/mL × 0.00032399455 = 0.32399455 ct/mm3
1,000 grains per milliliter = 0.32399455 carats per cubic millimeter.
Conversion table
| Grain per Milliliter (gr/mL) | Carat per Cubic Millimeter (ct/mm3) |
|---|---|
| 0.1 gr/mL | 0.0000323995 ct/mm3 |
| 1 gr/mL | 0.0003239946 ct/mm3 |
| 10 gr/mL | 0.0032399455 ct/mm3 |
| 100 gr/mL | 0.032399455 ct/mm3 |
| 1,000 gr/mL | 0.32399455 ct/mm3 |
| 10,000 gr/mL | 3.2399455 ct/mm3 |
Reverse conversion: Carat per Cubic Millimeter to Grain per Milliliter
0.0003239946 ct/mm3 × 3086.471671 = 1.000000154 gr/mL
0.0003239946 carats per cubic millimeter = 1.000000154 grains per milliliter.
grains per milliliter = carats per cubic millimeter × 3086.47167059
For a page dedicated to this direction, see Carat per Cubic Millimeter to Grain per Milliliter.
Understanding the Grain per Milliliter (gr/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 grain per milliliter?
1 grain per milliliter equals 0.0003239946 carats per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert grain per milliliter to carat per cubic millimeter?
Multiply the grain per milliliter value by 0.00032399455. The converter above does this instantly to whatever precision you set.
How do I convert carat per cubic millimeter back to grain per milliliter?
Use the reverse factor: 1 carat per cubic millimeter equals 3,086.471671 grains per milliliter. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per milliliter?
Grain per Milliliter (gr/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 grain per milliliter to carat per cubic millimeter conversion exact?
Yes. Both grain per milliliter and carat per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.00032399455 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.