Mass per volume density.
Pounds per Fluid ounce to Pounds per Gallon Converter — lb/fl oz to lb/gal
Convert Pound per Fluid ounce (lb/fl oz) to Pound per Gallon (lb/gal) using the exact conversion factor (1 pound per fluid ounce = 128 pound per gallon). See the formula, worked examples, conversion table, and common uses.
Pounds 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 15337.7827 / 119.8264273.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Fluid ounce to Pounds per Gallon
Pound 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 = pounds per fluid ounce × 128
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per fluid ounce equals 15337.7826966 base units, and 1 pound per gallon equals 119.826427317 base units, so dividing one by the other gives the direct pound per fluid ounce-to-pound per gallon factor of 128.
Simple example
1 lb/fl oz × 128 = 128 lb/gal
1 pound per fluid ounce = 128 pounds per gallon.
Real-world example
1,000 lb/fl oz × 128 = 128,000 lb/gal
1,000 pounds per fluid ounce = 128,000 pounds per gallon.
Conversion table
| Pound per Fluid ounce (lb/fl oz) | Pound per Gallon (lb/gal) |
|---|---|
| 0.1 lb/fl oz | 12.8 lb/gal |
| 1 lb/fl oz | 128 lb/gal |
| 10 lb/fl oz | 1,280 lb/gal |
| 100 lb/fl oz | 12,800 lb/gal |
| 1,000 lb/fl oz | 128,000 lb/gal |
| 10,000 lb/fl oz | 1,280,000 lb/gal |
Reverse conversion: Pound per Gallon to Pound per Fluid ounce
128 lb/gal × 0.0078125 = 1 lb/fl oz
128 pounds per gallon = 1 pound per fluid ounce.
pounds per fluid ounce = pounds per gallon × 0.0078125
For a page dedicated to this direction, see Pound per Gallon to Pound per Fluid ounce.
Understanding the Pound per Fluid ounce (lb/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 pound per fluid ounce?
1 pound per fluid ounce equals 128 pounds per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per fluid ounce to pound per gallon?
Multiply the pound per fluid ounce value by 128. The converter above does this instantly to whatever precision you set.
How do I convert pound per gallon back to pound per fluid ounce?
Use the reverse factor: 1 pound per gallon equals 0.0078125 pounds per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per fluid ounce?
Pound per Fluid ounce (lb/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 pound per fluid ounce to pound per gallon conversion exact?
Yes. Both pound per fluid ounce and pound per gallon are defined by fixed standards rather than physical artifacts, so the factor of 128 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.