Mass per volume density.
Ounce per Cubic inches to Grains per Cubic Millimeter Converter — oz/in3 to gr/mm3
Convert Ounce per Cubic inch (oz/in3) to Grain per Cubic Millimeter (gr/mm3) using the exact conversion factor (1 ounce per cubic inch = 0.026697888 grain per cubic millimeter). See the formula, worked examples, and conversion table.
Ounce per Cubic inches to Grains 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 1729.994044 / 64798.91.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounce per Cubic inches to Grains per Cubic Millimeter
Ounce per Cubic inch and Grain 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
grains per cubic millimeter = ounce per cubic inches × 0.0266978880414
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce per cubic inch equals 1729.99404439 base units, and 1 grain per cubic millimeter equals 64798.91 base units, so dividing one by the other gives the direct ounce per cubic inch-to-grain per cubic millimeter factor of 0.0266978880414.
Simple example
1 oz/in3 × 0.02669788804 = 0.026697888 gr/mm3
1 ounce per cubic inch = 0.026697888 grains per cubic millimeter.
Real-world example
1,000 oz/in3 × 0.02669788804 = 26.69788804 gr/mm3
1,000 ounce per cubic inches = 26.69788804 grains per cubic millimeter.
Conversion table
| Ounce per Cubic inch (oz/in3) | Grain per Cubic Millimeter (gr/mm3) |
|---|---|
| 0.1 oz/in3 | 0.0026697888 gr/mm3 |
| 1 oz/in3 | 0.026697888 gr/mm3 |
| 10 oz/in3 | 0.2669788804 gr/mm3 |
| 100 oz/in3 | 2.669788804 gr/mm3 |
| 1,000 oz/in3 | 26.69788804 gr/mm3 |
| 10,000 oz/in3 | 266.9788804 gr/mm3 |
Reverse conversion: Grain per Cubic Millimeter to Ounce per Cubic inch
0.026697888 gr/mm3 × 37.45614629 = 0.9999999984 oz/in3
0.026697888 grains per cubic millimeter = 0.9999999984 ounce per cubic inches.
ounce per cubic inches = grains per cubic millimeter × 37.4561462857
For a page dedicated to this direction, see Grain per Cubic Millimeter to Ounce per Cubic inch.
Understanding the Ounce per Cubic inch (oz/in3)
Mass per volume density.
Understanding the Grain per Cubic Millimeter (gr/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per cubic millimeter are in 1 ounce per cubic inch?
1 ounce per cubic inch equals 0.026697888 grains per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per cubic inch to grain per cubic millimeter?
Multiply the ounce per cubic inch value by 0.02669788804. The converter above does this instantly to whatever precision you set.
How do I convert grain per cubic millimeter back to ounce per cubic inch?
Use the reverse factor: 1 grain per cubic millimeter equals 37.45614629 ounce per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a ounce per cubic inch?
Ounce per Cubic inch (oz/in3) is a unit of density.
What is a grain per cubic millimeter?
Grain per Cubic Millimeter (gr/mm3) is a unit of density.
Is the ounce per cubic inch to grain per cubic millimeter conversion exact?
Yes. Both ounce per cubic inch and grain per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.02669788804 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.