US liquid gallon to Liter
gal
l
Conversion History
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Quick Reference Table (US liquid gallon to Liter)
| US liquid gallon (gal) | Liter (l) |
|---|---|
| 0.5 | 1.892705892 |
| 1 | 3.785411784 |
| 2 | 7.570823568 |
| 5 | 18.92705892 |
| 10 | 37.85411784 |
| 50 | 189.2705892 |
About US liquid gallon (gal)
The US liquid gallon is a unit of volume equal to 4 quarts, 8 pints, or 128 US fluid ounces, approximately 3.785 liters. It is the primary large liquid volume unit in the United States, used for fuel pricing at the pump, milk and juice packaging, and paint. US fuel economy is measured in miles per gallon (MPG). The US gallon is about 17% smaller than the UK imperial gallon (4.546 L), causing significant differences in fuel economy comparisons.
A gallon jug of milk is 3.785 L. Petrol (gasoline) is priced per US gallon at every US fuel station.
About Liter (l)
The liter (L) is the fundamental practical unit of volume in the metric system, defined as exactly one cubic decimeter (dm³) or 0.001 cubic meters. It is accepted for use with the SI but is not technically an SI base unit. The liter is the universal standard for beverages, fuel, and everyday liquid measurement in nearly all countries. One liter of pure water at 4°C has a mass of exactly one kilogram — a relationship that underpins many metric system conventions.
A standard 1-liter water bottle. A car petrol tank holds 40–70 liters. A human body contains roughly 5 liters of blood.
Etymology: From French "liter", derived from Old French "litron" (a unit of dry measure), from Medieval Latin "litra", from Greek "litra" (a monetary unit of weight in Sicily).
US liquid gallon – Frequently Asked Questions
Why does the US still price fuel per gallon when the rest of the world uses liters?
US fuel infrastructure — pumps, tax law, pipeline contracts, and consumer expectations — is built around the gallon. Federal and state fuel taxes are levied per gallon; EPA fuel economy standards use miles per gallon; and consumers benchmark prices against a gallon reference ("$3 a gallon"). Switching to liters would require reprogramming every pump, rewriting tax code, and re-educating 330 million people who compare prices by the gallon. Canada made the switch in the 1970s during a broader metrication push, but the US never had the political will for a comprehensive changeover.
Why is the US gallon smaller than the UK gallon?
The US gallon (3.785 L) is based on the Queen Anne wine gallon of 1707 (231 cubic inches). The UK imperial gallon (4.546 L) was defined in 1824 as the volume of 10 pounds of water. The two systems diverged after US independence.
How does US MPG compare to L/100km?
To convert: L/100km = 235.2 ÷ MPG (US). A car achieving 30 MPG uses about 7.8 L/100km. UK MPG values are always higher than US MPG for the same car because the imperial gallon is larger.
How many gallons of water does a person drink per day?
Recommended daily water intake is about 2–3 liters (roughly 0.5–0.8 US gallons). The commonly cited "8 glasses a day" ≈ 64 fl oz ≈ 0.5 gallons ≈ 1.9 liters.
How many gallons does a car fuel tank hold?
Most US passenger cars have fuel tanks of 10–20 gallons (38–76 liters). Compact cars are typically 10–13 gallons; mid-size cars 14–17 gallons; SUVs and trucks 18–36 gallons.
Liter – Frequently Asked Questions
How many milliliters are in a liter?
There are exactly 1,000 milliliters in one liter. This is one of the most fundamental metric relationships: 1 L = 1,000 mL = 1 dm³ = 1,000 cm³.
Why does 1 liter of water weigh 1 kilogram?
The kilogram was originally defined as the mass of one liter of pure water at 4°C (the temperature at which water is densest). Although the kilogram is now defined by the Planck constant, the relationship still holds to very high precision.
What is the difference between "liter" and "liter"?
"Liter" is the standard spelling in British English and most of the world. "Liter" is the American English spelling. Both refer to the same unit. The SI formally prefers "liter" but accepts both spellings.
How many liters are in a gallon?
One US liquid gallon equals approximately 3.785 liters. One imperial (UK) gallon equals approximately 4.546 liters. Because the two gallons differ by about 20%, fuel economy figures in L/100km and MPG do not convert directly without specifying which gallon.
How much blood does the human body contain in liters?
An average adult has approximately 4.5–5.5 liters of blood, with 5 liters being the commonly cited figure. Blood volume varies with body size, fitness, and altitude.