# Gallons to Pounds Calculator

Convert gallons to pounds for water, milk, gasoline, honey, and more. Select your liquid for an accurate weight based on density.

## What this calculates

Convert US gallons to pounds for water and other common liquids. A gallon of water weighs about 8.34 pounds, but a gallon of honey weighs around 12 pounds because it is denser. Select your liquid from the list to get an accurate weight estimate.

## Inputs

- **US Gallons** (gal) — min 0 — Enter the volume in US gallons.
- **Liquid** — options: Water (8.345 lb/gal), Whole Milk (8.6 lb/gal), Gasoline (6.3 lb/gal), Diesel Fuel (7.1 lb/gal), Honey (12.0 lb/gal), Olive Oil (7.6 lb/gal), Vegetable Oil (7.7 lb/gal), Maple Syrup (11.0 lb/gal), Beer (8.4 lb/gal), Wine (8.4 lb/gal), Seawater (8.6 lb/gal), Concrete Slurry (15.6 lb/gal), Custom (enter lb/gal)
- **Custom Density (lb/gal)** (lb/gal) — min 0.1, max 30 — Only used when 'Custom' is selected.

## Outputs

- **Pounds** (lb) — Weight in pounds.
- **Kilograms** (kg) — Weight in kilograms.
- **Ounces** (oz) — Weight in ounces.
- **Liters** (L) — Volume in liters (1 US gal = 3.78541 L).

## Details

Converting between volume (gallons) and weight (pounds) requires knowing the liquid's density. This is not a fixed ratio because different liquids have different densities.

Liquid Weights (Pounds per US Gallon at Room Temperature)

Liquid
lb/gal
kg/L

Water
8.345
1.000

Whole Milk
8.6
1.030

Gasoline
6.3
0.755

Diesel Fuel
7.1
0.850

Honey
12.0
1.438

Olive Oil
7.6
0.911

Maple Syrup
11.0
1.318

Beer
8.4
1.007

Seawater
8.6
1.025

The classic question: "How much does a gallon of water weigh?" The answer is 8.345 pounds (3.785 kg) at 62°F (16.7°C). Temperature matters slightly. Hot water is slightly lighter because it expands; cold water is slightly heavier.

Practical examples: A 5-gallon water jug weighs about 41.7 lb. A full 55-gallon drum of water weighs about 459 lb. If you are loading liquids into a truck, knowing the weight per gallon helps you avoid exceeding axle limits.

## Frequently Asked Questions

**Q: How much does a gallon of water weigh?**

A: One US gallon of water weighs approximately 8.345 pounds (3.785 kg) at 62°F. The old saying "a pint's a pound the world around" is close: a US pint of water weighs about 1.04 pounds.

**Q: Why does a gallon of honey weigh more than a gallon of water?**

A: Honey is denser than water. Its density is about 1.42 kg/L compared to water's 1.00 kg/L. The sugars and low moisture content in honey pack more mass into the same volume. A gallon of honey weighs roughly 12 pounds versus water's 8.3 pounds.

**Q: Does temperature affect how much a gallon of liquid weighs?**

A: Yes. Liquids expand when heated, so a gallon of hot water weighs slightly less than a gallon of cold water. The difference is small for everyday purposes (less than 1%), but it matters in scientific and industrial applications.

**Q: What is the difference between a US gallon and an imperial gallon?**

A: A US gallon is 3.785 liters (128 US fl oz), while an imperial gallon is 4.546 liters (160 imp fl oz). The imperial gallon is about 20% larger. One imperial gallon of water weighs about 10 pounds, compared to 8.345 pounds for a US gallon.

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Source: https://vastcalc.com/calculators/conversion/gallons-to-pounds
Category: Conversion
Last updated: 2026-04-21