How much does a gallon of water weigh?
This tool uses about 8.34 pounds per US gallon.
Gallons to Pounds Converter
Estimate liquid weight from US gallons and pounds-per-gallon density.
Enter gallons and liquid density
Choose a common liquid or provide a measured custom density.
About this converter
How to use Gallons to Pounds Converter, plus the formulas and logic behind the results.
Tool description
Gallons measure volume and pounds measure weight, so a density is required. Temperature and composition can change density.
How to use
- Enter US gallons.
- Select the liquid or Custom.
- Enter custom lb/gal if needed.
- Select Calculate for pounds.
Formulas & reference
pounds = US gallons × density (lb/gal)
Quick reference
- pounds = US gallons × density (lb/gal)
Calculation logic
The selected pounds-per-gallon density is multiplied by the US gallon volume.
Results use standard stated conversion factors and may be rounded for display.
Gallons to Pounds Converter FAQ
Common questions about this conversion and how to interpret the result.
Why does a gallon not have one fixed weight?
Different liquids have different densities.
How much does milk weigh per gallon?
A typical estimate is about 8.6 pounds per US gallon.
How much does gasoline weigh per gallon?
This tool uses about 6.1 pounds, though blends and temperature vary.
Can I enter another liquid?
Yes. Choose Custom and enter density in lb/gal.
Does this use US gallons?
Yes, not imperial gallons.