Gallons to Pounds Converter

Overview & Capabilities

Converting gallons (gal) to pounds (lb) requires accounting for the substance's specific gravity and liquid density. While 1 US gallon of fresh water weighs 8.345 pounds, gasoline weighs only 6.07 lb/gal, whole milk weighs 8.60 lb/gal, and dense honey weighs 11.35 lb/gal. Multiplying liquid gallons by the substance density per gallon determines the exact payload weight for vehicle hauling and aircraft fuel balance.

Tutorial

How to Use

01

Select your liquid substance (Water, Milk, Gasoline, Diesel, Engine Oil, Honey).

02

Enter the liquid volume in US Gallons (gal).

03

The engine multiplies gallons by the substance density (e.g. 8.345 lb/gal for water).

04

Export total pound weight for truck axle limits or boat ballast calculations.

Capabilities

Key Features

Substance-specific liquid density database (200+ liquids and oils)

Fluid Weight Benchmarks: Water (8.35 lb/gal), Milk (8.60 lb/gal), Gasoline (6.07 lb/gal), Diesel (7.09 lb/gal), Honey (11.35 lb/gal)

Aircraft fuel mass & vehicle payload weight calculator

Instant responsive output

Applications

Common Use Cases

Aviation Fuel Planning: Calculate the weight of 50 gallons of 100LL aviation gasoline (300 lbs) for aircraft takeoff weight and balance.

Livestock Water Hauling: Convert a 250-gallon water tank into 2,086 pounds to verify trailer tow capacity.

Dairy Tanker Loading: Calculate the mass of 1,200 gallons of farm milk (10,314 lbs) for road weight compliance.

Guidance

Tips & Best Practices

💡

Rule of thumb for water: "A pint's a pound the world around" (1 gallon of water = 8.345 lbs).

💡

Fuel is lighter than water: 1 gallon of gasoline weighs roughly 6.0 to 6.3 lbs.

Ecosystem

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Answers

Frequently Asked Questions

Q How much does 1 gallon of water weigh in pounds?

1 US gallon of pure water weighs approximately 8.345 pounds (3.785 kg) at room temperature.

Q How much does 5 gallons of water weigh in pounds?

5 gallons of water weighs 41.73 pounds.

Q How much does 1 gallon of milk weigh?

1 gallon of whole milk weighs approximately 8.60 pounds.

Q How much does 1 gallon of gasoline weigh?

1 gallon of automotive gasoline weighs approximately 6.07 to 6.25 pounds.

Gallons to Pounds Converter — Liquid Specific Gravity & Fluid Payloads

Quick Conversions for Water (Gallons to Pounds)