Mass per volume density.
Grains per Fluid ounce to Pounds per Gallon Converter — gr/fl oz to lb/gal
Convert Grain per Fluid ounce (gr/fl oz) to Pound per Gallon (lb/gal) using the exact conversion factor (1 grain per fluid ounce = 0.0182857143 pound per gallon). See the formula, worked examples, conversion table, and common uses.
Grains per Fluid ounce 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 2.191111814 / 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 Fluid ounce to Pounds per Gallon
Grain per Fluid ounce 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 fluid ounce × 0.0182857142857
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per fluid ounce equals 2.19111181379 base units, and 1 pound per gallon equals 119.826427317 base units, so dividing one by the other gives the direct grain per fluid ounce-to-pound per gallon factor of 0.0182857142857.
Simple example
1 gr/fl oz × 0.01828571429 = 0.0182857143 lb/gal
1 grain per fluid ounce = 0.0182857143 pounds per gallon.
Real-world example
1,000 gr/fl oz × 0.01828571429 = 18.28571429 lb/gal
1,000 grains per fluid ounce = 18.28571429 pounds per gallon.
Conversion table
| Grain per Fluid ounce (gr/fl oz) | Pound per Gallon (lb/gal) |
|---|---|
| 0.1 gr/fl oz | 0.0018285714 lb/gal |
| 1 gr/fl oz | 0.0182857143 lb/gal |
| 10 gr/fl oz | 0.1828571429 lb/gal |
| 100 gr/fl oz | 1.828571429 lb/gal |
| 1,000 gr/fl oz | 18.28571429 lb/gal |
| 10,000 gr/fl oz | 182.8571429 lb/gal |
Reverse conversion: Pound per Gallon to Grain per Fluid ounce
0.0182857143 lb/gal × 54.6875 = 1.000000001 gr/fl oz
0.0182857143 pounds per gallon = 1.000000001 grains per fluid ounce.
grains per fluid ounce = pounds per gallon × 54.6875
For a page dedicated to this direction, see Pound per Gallon to Grain per Fluid ounce.
Understanding the Grain per Fluid ounce (gr/fl oz)
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 fluid ounce?
1 grain per fluid ounce equals 0.0182857143 pounds per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert grain per fluid ounce to pound per gallon?
Multiply the grain per fluid ounce value by 0.01828571429. The converter above does this instantly to whatever precision you set.
How do I convert pound per gallon back to grain per fluid ounce?
Use the reverse factor: 1 pound per gallon equals 54.6875 grains per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per fluid ounce?
Grain per Fluid ounce (gr/fl oz) 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 fluid ounce to pound per gallon conversion exact?
Yes. Both grain per fluid ounce and pound per gallon are defined by fixed standards rather than physical artifacts, so the factor of 0.01828571429 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.