Mass per volume density.
Grain per Cubic inches to Pounds per Cubic Meter Converter — gr/in3 to lb/m3
Convert Grain per Cubic inch (gr/in3) to Pound per Cubic Meter (lb/m3) using the exact conversion factor (1 grain per cubic inch = 8.717677728 pound per cubic meter). See the formula, worked examples, and conversion table.
Grain per Cubic inches to Pounds per Cubic Meter 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 3.954272101 / 0.45359237.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grain per Cubic inches to Pounds per Cubic Meter
Grain per Cubic inch and Pound per Cubic Meter 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
pounds per cubic meter = grain per cubic inches × 8.71767772782
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cubic inch equals 3.95427210146 base units, and 1 pound per cubic meter equals 0.45359237 base units, so dividing one by the other gives the direct grain per cubic inch-to-pound per cubic meter factor of 8.71767772782.
Simple example
1 gr/in3 × 8.717677728 = 8.717677728 lb/m3
1 grain per cubic inch = 8.717677728 pounds per cubic meter.
Real-world example
1,000 gr/in3 × 8.717677728 = 8,717.677728 lb/m3
1,000 grain per cubic inches = 8,717.677728 pounds per cubic meter.
Conversion table
| Grain per Cubic inch (gr/in3) | Pound per Cubic Meter (lb/m3) |
|---|---|
| 0.1 gr/in3 | 0.8717677728 lb/m3 |
| 1 gr/in3 | 8.717677728 lb/m3 |
| 10 gr/in3 | 87.17677728 lb/m3 |
| 100 gr/in3 | 871.7677728 lb/m3 |
| 1,000 gr/in3 | 8,717.677728 lb/m3 |
| 10,000 gr/in3 | 87,176.77728 lb/m3 |
Reverse conversion: Pound per Cubic Meter to Grain per Cubic inch
8.717677728 lb/m3 × 0.114709448 = 1 gr/in3
8.717677728 pounds per cubic meter = 1 grain per cubic inches.
grain per cubic inches = pounds per cubic meter × 0.114709448
For a page dedicated to this direction, see Pound per Cubic Meter to Grain per Cubic inch.
Understanding the Grain per Cubic inch (gr/in3)
Mass per volume density.
Understanding the Pound per Cubic Meter (lb/m3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cubic meter are in 1 grain per cubic inch?
1 grain per cubic inch equals 8.717677728 pounds per cubic meter, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cubic inch to pound per cubic meter?
Multiply the grain per cubic inch value by 8.717677728. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic meter back to grain per cubic inch?
Use the reverse factor: 1 pound per cubic meter equals 0.114709448 grain per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cubic inch?
Grain per Cubic inch (gr/in3) is a unit of density.
What is a pound per cubic meter?
Pound per Cubic Meter (lb/m3) is a unit of density.
Is the grain per cubic inch to pound per cubic meter conversion exact?
Yes. Both grain per cubic inch and pound per cubic meter are defined by fixed standards rather than physical artifacts, so the factor of 8.717677728 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.