Mass per volume density.
Gram per Cubic inches to Carats per Cubic Millimeter Converter — g/in3 to ct/mm3
Convert Gram per Cubic inch (g/in3) to Carat per Cubic Millimeter (ct/mm3) using the exact conversion factor (1 gram per cubic inch = 0.0003051187 carat per cubic millimeter). See the formula, worked examples, and conversion table.
Gram per Cubic inches 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 61.02374409 / 200000.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gram per Cubic inches to Carats per Cubic Millimeter
Gram per Cubic inch 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 = gram per cubic inches × 0.000305118720474
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per cubic inch equals 61.0237440947 base units, and 1 carat per cubic millimeter equals 200000 base units, so dividing one by the other gives the direct gram per cubic inch-to-carat per cubic millimeter factor of 0.000305118720474.
Simple example
1 g/in3 × 0.0003051187205 = 0.0003051187 ct/mm3
1 gram per cubic inch = 0.0003051187 carats per cubic millimeter.
Real-world example
1,000 g/in3 × 0.0003051187205 = 0.3051187205 ct/mm3
1,000 gram per cubic inches = 0.3051187205 carats per cubic millimeter.
Conversion table
| Gram per Cubic inch (g/in3) | Carat per Cubic Millimeter (ct/mm3) |
|---|---|
| 0.1 g/in3 | 0.0000305119 ct/mm3 |
| 1 g/in3 | 0.0003051187 ct/mm3 |
| 10 g/in3 | 0.0030511872 ct/mm3 |
| 100 g/in3 | 0.0305118721 ct/mm3 |
| 1,000 g/in3 | 0.3051187205 ct/mm3 |
| 10,000 g/in3 | 3.051187205 ct/mm3 |
Reverse conversion: Carat per Cubic Millimeter to Gram per Cubic inch
0.0003051187 ct/mm3 × 3277.4128 = 0.9999999329 g/in3
0.0003051187 carats per cubic millimeter = 0.9999999329 gram per cubic inches.
gram per cubic inches = carats per cubic millimeter × 3277.4128
For a page dedicated to this direction, see Carat per Cubic Millimeter to Gram per Cubic inch.
Understanding the Gram per Cubic inch (g/in3)
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 gram per cubic inch?
1 gram per cubic inch equals 0.0003051187 carats per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert gram per cubic inch to carat per cubic millimeter?
Multiply the gram per cubic inch value by 0.0003051187205. The converter above does this instantly to whatever precision you set.
How do I convert carat per cubic millimeter back to gram per cubic inch?
Use the reverse factor: 1 carat per cubic millimeter equals 3,277.4128 gram per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per cubic inch?
Gram per Cubic inch (g/in3) 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 gram per cubic inch to carat per cubic millimeter conversion exact?
Yes. Both gram per cubic inch and carat per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.0003051187205 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.