Convert US Gallon to Cubic Meter (gal (US) → m³)

Converting US gallons to cubic meters is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in US gallons

   Start with the number of US gallons (gal (US)) you want to convert.
2. 2
   Multiply by 0.003785

   The conversion factor from gal (US) to m³ is 0.003785. Multiply your value by this number.
3. 3
   Read the result in cubic meters

   The result is your value in cubic meters (m³).

Multiply the value in US gallons by 0.003785. For the reverse direction, multiply by 264.17205.

• ✓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).

• ✗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.

What is the US Gallon?

The US liquid gallon equals exactly 3.785411784 liters and is the standard volume unit for fuel, beverages, milk, and household liquids in the United States. Defined as 231 cubic inches, the US gallon descends from the English wine gallon of 1707, which Britain replaced with the larger imperial gallon in 1824 — a divergence that left the United States with a different gallon than the rest of the English-speaking world. American gas stations price gasoline by the gallon (typical fill-up: 12–15 gallons), milk is sold in half-gallons and gallons, and many beverages come in fluid-ounce subdivisions of the gallon. The US gallon relates to the liter (1 gal ≈ 3.785 L), the quart (4 qt = 1 gal), the pint (8 pt = 1 gal), the cup (16 cups = 1 gal), and the imperial gallon (1 imp gal ≈ 1.201 US gal — about 20% larger).

• US fuel pricing and consumption
• US paint, oil and cleaning-product packaging
• US beverage containers (1-gallon jugs of milk)

What is the Cubic Meter?

The cubic meter equals exactly 1,000 liters and is the SI unit of volume, used for water utilities, construction materials, shipping containers, gas volumes, and industrial-scale measurements. Domestic water bills typically show consumption in cubic meters (a typical household uses 5–15 m³ per month), and natural-gas billing also uses m³. Concrete is delivered by the cubic meter, and shipping containers have internal volumes of about 33 m³ (20-ft) or 67 m³ (40-ft). The cubic meter is the volume of a cube measuring 1 meter on each side. It relates to the liter (1 m³ = 1,000 L), the cubic centimeter (1 m³ = 1,000,000 cm³), the cubic foot (1 m³ ≈ 35.31 ft³), and the US gallon (1 m³ ≈ 264.17 gal). Truck-cargo capacity, swimming-pool size, and natural-gas reserves are all commonly expressed in cubic meters.

• Household water and gas consumption on utility bills
• Concrete ordering for construction projects
• Shipping container and freight capacity