Imperial Quarts to US Gallons (qt (UK) to gal)

1 imperial quart equals 0.3002374814 US gallons (rounded).

1 imperial quart = 0.3002374814 US gallons

How to convert imperial quarts to US gallons

To convert imperial quarts to US gallons, multiply the number of imperial quarts by 0.3002374814. The factor is rounded to 10 significant digits. To go the other way, multiply US gallons by 3.330696739 (rounded).

US gallons = imperial quarts × 0.3002374814

Example: 10 imperial quarts = 3.002374814 US gallons.

Pints, quarts, gallons and fluid ounces differ between the US and the UK. Units are labeled 'US' or 'imperial' to avoid confusion.

About these units

Imperial Quart (qt (UK))

Imperial (British)Current unit

One quarter of an imperial gallon, 1.1365 L (40 imperial fluid ounces).

Quart comes from the Latin quartus, through French quart, and simply means a quarter: one quarter of a gallon. Because gallons of different sizes were in use over the centuries, quarts varied with them. The imperial version descends from the gallon fixed by the Weights and Measures Act 1824, defined by the weight of ten pounds of distilled water, which gave about 4.54 liters.

The modern figure is exact. The imperial gallon is now 4.54609 liters, so the imperial quart is 1.1365225 liters, equal to two imperial pints, eight gills or 40 imperial fluid ounces. British law still lists the quart as a quarter of a gallon among supplementary units. It is about 1.2 US liquid quarts, so recipes and cans from Britain, Canada and the United States can differ by a fifth. Canada's federal law even calls the imperial quart a pinte in French.

1 imperial quart = 1.1365225 liters (exactly).

Sources: Wikipedia: Quart; Wikipedia: Imperial units; UK Weights and Measures Act 1985, Schedule 1

US Gallon (gal)

US customaryCurrent unit

Exactly 231 cubic inches or 3.785411784 liters (128 US fluid ounces). About 17% smaller than the imperial gallon.

The US gallon is a survivor of English wine trade. Around 1706, a statute in Queen Anne's reign fixed the wine gallon at exactly 231 cubic inches, settling confusion among the competing gallons for wine, ale and corn. British colonies in North America used that wine gallon, and in 1824 Britain replaced all its gallons with a new imperial one while the United States kept the old measure. It was adopted as the legal US standard in 1836 and is still defined as exactly 231 cubic inches, or 3.785411784 liters.

That makes the US gallon about 17 percent smaller than the imperial gallon, a difference that explains why American and British fuel-economy figures cannot be compared directly. Everyday uses are milk jugs, paint cans and gasoline pumps. One gallon divides evenly into four quarts, eight pints, sixteen cups and 128 fluid ounces. A gallon of water weighs a little over 8 pounds, an easy figure to remember when loading a car with water jugs.

1 US gallon = 3.785411784 liters (exactly).

Sources: Wikipedia: Gallon; NIST SP 811, Appendix B.8: conversion factors for volume

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