# 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. Also shows kilograms and liters.

## 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: 2026-04-08