Convert US gallons to cubic meters

1 gal (US)=0.003785m³

Use the converter below to change any US gallons value into cubic meters instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.0037854

Conversion formula

Forward

cubic meters = US gallons × 0.003785

Reverse

US gallons = cubic meters × 264.172

Example: 10 gal (US) × 0.003785 = 0.03785 m³.

About both units

From

US Gallon

gal (US)

The US gallon equals 3.785411784 litres exactly. It is the standard fuel and liquid volume unit in the United States. A typical American car holds 14–18 US gallons of fuel. US fuel economy is quoted in miles per US gallon (mpg).

Real-world: US car tank ≈ 15 gallons (57 L). 1 US gallon of milk is a common grocery size (3.79 L). US paint often sold by the gallon.

Read full us gallon reference →

Cubic Meter

m³

The cubic metre is the SI derived unit of volume, equal to 1000 litres. It is used for large quantities — water supply, natural gas, concrete, shipping containers and storage tanks. A 20-foot shipping container holds about 33 m³.

Real-world: A 20 ft shipping container holds ~33 m³. UK household water use is ~130 m³/year. Natural gas is billed per m³ in Europe.

Read full cubic meter reference →

US Gallon to Cubic Meter conversion table

Common US gallons to cubic meters values for quick reference.

US Gallon (gal (US))	Cubic Meter (m³)
1 gal (US)	0.003785 m³
2 gal (US)	0.007571 m³
5 gal (US)	0.01893 m³
10 gal (US)	0.03785 m³
20 gal (US)	0.07571 m³
50 gal (US)	0.1893 m³
100 gal (US)	0.3785 m³
200 gal (US)	0.7571 m³
500 gal (US)	1.89271 m³
1,000 gal (US)	3.78541 m³

Tips & common mistakes

Quick tips

1 US gallon = 3.785 L = 128 US fluid ounces = 4 quarts.
Converting mpg (US) to L/100 km: 235.215 / mpg = L/100 km.
The US gallon is based on the old English Queen Anne wine gallon (1707).

Avoid these

Using UK gallons on a US fuel-economy figure — 30 mpg (US) = 36 mpg (UK).
Confusing US gallon (3.79 L) with UK gallon (4.55 L) — 20% difference.
Using "gallon" without qualifier in cross-Atlantic commerce.

Frequently asked questions

How many cubic meters in a us gallon?

One us gallon equals 0.003785 cubic meters.

How do I convert US gallons to cubic meters?

Multiply the us gallon value by 0.003785 to get the equivalent in cubic meters.

What is 100 US gallons in cubic meters?

100 US gallons equals 0.3785 cubic meters.

Is a us gallon bigger than a cubic meter?

No. 1 us gallon equals 0.003785 cubic meters, so one us gallon is smaller.

How to convert US gallons to cubic meters without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

Related volume conversions

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