Mass per volume density.
Grains per Cubic Meter to Pounds per Gallon Converter — gr/m3 to lb/gal
Convert Grain per Cubic Meter (gr/m3) to Pound per Gallon (lb/gal) using the exact conversion factor (1 grain per cubic meter = 5.407731e-7 pound per gallon). See the formula, worked examples, conversion table, and common uses.
Grains per Cubic Meter to Pounds per Gallon 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 6.479891e-5 / 119.8264273.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cubic Meter to Pounds per Gallon
Grain per Cubic Meter and Pound per Gallon 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 gallon = grains per cubic meter × 5.407731e-7
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cubic meter equals 0.00006479891 base units, and 1 pound per gallon equals 119.826427317 base units, so dividing one by the other gives the direct grain per cubic meter-to-pound per gallon factor of 5.407731e-7.
Simple example
1 gr/m3 × 5.407731e-7 = 5.407731e-7 lb/gal
1 grain per cubic meter = 5.407731e-7 pounds per gallon.
Real-world example
1,000 gr/m3 × 5.407731e-7 = 0.0005407731 lb/gal
1,000 grains per cubic meter = 0.0005407731 pounds per gallon.
Conversion table
| Grain per Cubic Meter (gr/m3) | Pound per Gallon (lb/gal) |
|---|---|
| 0.1 gr/m3 | 5.407731e-8 lb/gal |
| 1 gr/m3 | 5.407731e-7 lb/gal |
| 10 gr/m3 | 0.0000054077 lb/gal |
| 100 gr/m3 | 0.0000540773 lb/gal |
| 1,000 gr/m3 | 0.0005407731 lb/gal |
| 10,000 gr/m3 | 0.0054077311 lb/gal |
Reverse conversion: Pound per Gallon to Grain per Cubic Meter
5.407731e-7 lb/gal × 1849204.367 = 0.9999999778 gr/m3
5.407731e-7 pounds per gallon = 0.9999999778 grains per cubic meter.
grains per cubic meter = pounds per gallon × 1849204.36651
For a page dedicated to this direction, see Pound per Gallon to Grain per Cubic Meter.
Understanding the Grain per Cubic Meter (gr/m3)
Mass per volume density.
Understanding the Pound per Gallon
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
Where it's used: United States (paint, fuel, and industrial liquid density specifications)
lb/gal vs. lb/ft³. Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.
Uses of the Pound per Gallon today
- US paint and coatings density specifications
- US fuel and petroleum liquid density specs
- Industrial liquid handling and shipping weight calculations
Pound per Gallon — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per gallon are in 1 grain per cubic meter?
1 grain per cubic meter equals 5.407731e-7 pounds per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cubic meter to pound per gallon?
Multiply the grain per cubic meter value by 5.407731e-7. The converter above does this instantly to whatever precision you set.
How do I convert pound per gallon back to grain per cubic meter?
Use the reverse factor: 1 pound per gallon equals 1,849,204.367 grains per cubic meter. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cubic meter?
Grain per Cubic Meter (gr/m3) is a unit of density.
What is a pound per gallon?
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
Is the grain per cubic meter to pound per gallon conversion exact?
Yes. Both grain per cubic meter and pound per gallon are defined by fixed standards rather than physical artifacts, so the factor of 5.407731e-7 used above is exact to as many digits as you choose to display.
What is the difference between lb/gal vs. lb/ft³?
Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.