Mass concentration.
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
Chemistry Converter
Convert concentration, molarity, amount, and laboratory scientific units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
Mass concentration.
Result = input x 15337.7827 / 119.8264273.
Mass Concentration units are compatible.
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 mass concentration — how much of a substance is dissolved or dispersed in a given volume — a core calculation for preparing lab solutions, checking water quality against a regulatory limit, or formulating a pharmaceutical dose. Both are mass concentration 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
100 lb/fl oz × 128 = 12,800 lb/gal
100 pounds per fluid ounce = 12,800 pounds per gallon.
Conversion table
| Pound per Fluid ounce (lb/fl oz) | Pound per Gallon (lb/gal) |
|---|---|
| 0.001 lb/fl oz | 0.128 lb/gal |
| 0.01 lb/fl oz | 1.28 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 |
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 concentration.
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 chemistry.
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.