Mass per volume density.
Grains per Cubic Millimeter to Pounds per Quart Converter — gr/mm3 to lb/qt
Convert Grain per Cubic Millimeter (gr/mm3) to Pound per Quart (lb/qt) using the exact conversion factor (1 grain per cubic millimeter = 135.193278 pound per quart). See the formula, worked examples, and conversion table.
Grains per Cubic Millimeter to Pounds per Quart 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 / 479.3057093.
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 Pounds per Quart
Grain per Cubic Millimeter and Pound per Quart 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 quart = grains per cubic millimeter × 135.193278
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 quart equals 479.305709268 base units, so dividing one by the other gives the direct grain per cubic millimeter-to-pound per quart factor of 135.193278.
Simple example
1 gr/mm3 × 135.193278 = 135.193278 lb/qt
1 grain per cubic millimeter = 135.193278 pounds per quart.
Real-world example
1,000 gr/mm3 × 135.193278 = 135,193.278 lb/qt
1,000 grains per cubic millimeter = 135,193.278 pounds per quart.
Conversion table
| Grain per Cubic Millimeter (gr/mm3) | Pound per Quart (lb/qt) |
|---|---|
| 0.1 gr/mm3 | 13.5193278 lb/qt |
| 1 gr/mm3 | 135.193278 lb/qt |
| 10 gr/mm3 | 1,351.93278 lb/qt |
| 100 gr/mm3 | 13,519.3278 lb/qt |
| 1,000 gr/mm3 | 135,193.278 lb/qt |
| 10,000 gr/mm3 | 1,351,932.78 lb/qt |
Reverse conversion: Pound per Quart to Grain per Cubic Millimeter
135.193278 lb/qt × 0.007396817466 = 1 gr/mm3
135.193278 pounds per quart = 1 grains per cubic millimeter.
grains per cubic millimeter = pounds per quart × 0.00739681746603
For a page dedicated to this direction, see Pound per Quart to Grain per Cubic Millimeter.
Understanding the Grain per Cubic Millimeter (gr/mm3)
Mass per volume density.
Understanding the Pound per Quart (lb/qt)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per quart are in 1 grain per cubic millimeter?
1 grain per cubic millimeter equals 135.193278 pounds per quart, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cubic millimeter to pound per quart?
Multiply the grain per cubic millimeter value by 135.193278. The converter above does this instantly to whatever precision you set.
How do I convert pound per quart back to grain per cubic millimeter?
Use the reverse factor: 1 pound per quart equals 0.0073968175 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 quart?
Pound per Quart (lb/qt) is a unit of density.
Is the grain per cubic millimeter to pound per quart conversion exact?
Yes. Both grain per cubic millimeter and pound per quart are defined by fixed standards rather than physical artifacts, so the factor of 135.193278 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.