Mass per volume density.
Grains per Cubic Millimeter to Pound per Cubic inches Converter — gr/mm3 to lb/in3
Convert Grain per Cubic Millimeter (gr/mm3) to Pound per Cubic inch (lb/in3) using the exact conversion factor (1 grain per cubic millimeter = 2.341009143 pound per cubic inch). See the formula, worked examples, conversion table, and common uses.
Grains per Cubic Millimeter to Pound per Cubic inches 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 64798.91 / 27679.90471.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cubic Millimeter to Pound per Cubic inches
Grain per Cubic Millimeter and Pound per Cubic inch 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
pound per cubic inches = grains per cubic millimeter × 2.34100914286
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cubic millimeter equals 64798.91 base units, and 1 pound per cubic inch equals 27679.9047102 base units, so dividing one by the other gives the direct grain per cubic millimeter-to-pound per cubic inch factor of 2.34100914286.
Simple example
1 gr/mm3 × 2.341009143 = 2.341009143 lb/in3
1 grain per cubic millimeter = 2.341009143 pound per cubic inches.
Real-world example
1,000 gr/mm3 × 2.341009143 = 2,341.009143 lb/in3
1,000 grains per cubic millimeter = 2,341.009143 pound per cubic inches.
Conversion table
| Grain per Cubic Millimeter (gr/mm3) | Pound per Cubic inch (lb/in3) |
|---|---|
| 0.1 gr/mm3 | 0.2341009143 lb/in3 |
| 1 gr/mm3 | 2.341009143 lb/in3 |
| 10 gr/mm3 | 23.41009143 lb/in3 |
| 100 gr/mm3 | 234.1009143 lb/in3 |
| 1,000 gr/mm3 | 2,341.009143 lb/in3 |
| 10,000 gr/mm3 | 23,410.09143 lb/in3 |
Reverse conversion: Pound per Cubic inch to Grain per Cubic Millimeter
2.341009143 lb/in3 × 0.4271662087 = 1 gr/mm3
2.341009143 pound per cubic inches = 1 grains per cubic millimeter.
grains per cubic millimeter = pound per cubic inches × 0.427166208663
For a page dedicated to this direction, see Pound per Cubic inch to Grain per Cubic Millimeter.
Understanding the Grain per Cubic Millimeter (gr/mm3)
Mass per volume density.
Understanding the Pound per Cubic inch
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. It is classified as a US customary density unit.
Where it's used: United States
Uses of the Pound per Cubic inch today
- Used in machining and materials engineering, particularly for describing the density of metals, where a smaller volume unit than the cubic foot gives a more convenient figure
Pound per Cubic inch — sources
- US materials-engineering reference tables — Pounds per cubic inch is a commonly tabulated density unit for metals in US machining and materials references.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pound per cubic inches are in 1 grain per cubic millimeter?
1 grain per cubic millimeter equals 2.341009143 pound per cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cubic millimeter to pound per cubic inch?
Multiply the grain per cubic millimeter value by 2.341009143. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic inch back to grain per cubic millimeter?
Use the reverse factor: 1 pound per cubic inch equals 0.4271662087 grains per cubic millimeter. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cubic millimeter?
Grain per Cubic Millimeter (gr/mm3) is a unit of density.
What is a pound per cubic inch?
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. It is classified as a US customary density unit.
Is the grain per cubic millimeter to pound per cubic inch conversion exact?
Yes. Both grain per cubic millimeter and pound per cubic inch are defined by fixed standards rather than physical artifacts, so the factor of 2.341009143 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.