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What is a us gallon?

The US fuel and liquid volume unit — 17% smaller than the UK gallon

Definition

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).

Common uses

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

🌍 Real-world scale

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.

Convert from US gallons

14 conversions
US Gallon to Liter1 gal (US) = 3.78541 LUS Gallon to Milliliter1 gal (US) = 3,785.41 mlUS Gallon to Cubic Meter1 gal (US) = 0.003785 m³US Gallon to UK Gallon1 gal (US) = 0.8327 gal (UK)US Gallon to Fluid Ounce1 gal (US) = 128 fl ozUS Gallon to Cup1 gal (US) = 15.7725 cupUS Gallon to Pint1 gal (US) = 8 ptUS Gallon to Quart1 gal (US) = 4 qtUS Gallon to Tablespoon1 gal (US) = 255.771 tbspUS Gallon to Teaspoon1 gal (US) = 768 tspUS Gallon to Barrel1 gal (US) = 0.02381 bblUS Gallon to Cubic Inch1 gal (US) = 231 in³US Gallon to Cubic Foot1 gal (US) = 0.1337 ft³US Gallon to Cubic Yard1 gal (US) = 0.004951 yd³

Convert to US gallons

14 conversions
Liter to US Gallon1 L = 0.2642 gal (US)Milliliter to US Gallon1 ml = 0.0002642 gal (US)Cubic Meter to US Gallon1 m³ = 264.172 gal (US)UK Gallon to US Gallon1 gal (UK) = 1.20095 gal (US)Fluid Ounce to US Gallon1 fl oz = 0.007813 gal (US)Cup to US Gallon1 cup = 0.0634 gal (US)Pint to US Gallon1 pt = 0.125 gal (US)Quart to US Gallon1 qt = 0.25 gal (US)Tablespoon to US Gallon1 tbsp = 0.00391 gal (US)Teaspoon to US Gallon1 tsp = 0.001302 gal (US)Barrel to US Gallon1 bbl = 42 gal (US)Cubic Inch to US Gallon1 in³ = 0.004329 gal (US)Cubic Foot to US Gallon1 ft³ = 7.48052 gal (US)Cubic Yard to US Gallon1 yd³ = 201.974 gal (US)

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).

Common mistakes

  • 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.

FAQ about the us gallon

What is a us gallon?
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).
Where is the us gallon used?
The us gallon is commonly used for: US fuel pricing and consumption; US paint, oil and cleaning-product packaging; US beverage containers (1-gallon jugs of milk).
What is an example of a us gallon in real life?
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.
What category does the us gallon belong to?
The us gallon is a unit of volume, part of the 15-unit volume category on UnitConv.
How accurate are us gallon conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
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