Imperial fluid ounce to US liquid quart
imp fl oz
qt
Conversion History
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Quick Reference Table (Imperial fluid ounce to US liquid quart)
| Imperial fluid ounce (imp fl oz) | US liquid quart (qt) |
|---|---|
| 0.5 | 0.01501187406828540481446634 |
| 1 | 0.03002374813657080962893268 |
| 2 | 0.06004749627314161925786536 |
| 5 | 0.1501187406828540481446634 |
| 10 | 0.3002374813657080962893268 |
| 20 | 0.6004749627314161925786536 |
About Imperial fluid ounce (imp fl oz)
The imperial fluid ounce (imp fl oz) is a unit of volume equal to one twentieth of an imperial pint, approximately 28.413 milliliters. It is used in the United Kingdom and Commonwealth countries, though metric units have replaced it in most commercial contexts. The imperial fluid ounce is slightly smaller than the US fluid ounce (29.574 mL). UK spirits measures are now defined by law in 25 mL and 35 mL metric measures, which do not align exactly with the imperial fluid ounce.
A single spirits measure in a UK bar is 25 mL or 35 mL — close to, but not exactly, one imperial fluid ounce (28.41 mL).
About US liquid quart (qt)
The US liquid quart (qt) is a unit of volume equal to 2 US liquid pints or 32 US fluid ounces, approximately 946.4 milliliters. It is used for beverages, dairy products, soups, and motor oil in the United States. Motor oil is typically sold in 1-quart bottles. Soups, broths, and juices are commonly packaged in 32-oz (1-quart) cartons. The US liquid quart is smaller than the imperial quart (1,136.5 mL).
A standard carton of chicken broth is 32 fl oz (1 qt, ~946 mL). Motor oil is sold in 1-quart bottles.
Imperial fluid ounce – Frequently Asked Questions
Why did the UK abandon the fluid ounce for spirits but keep the pint for beer?
When the UK metricated in the 1990s, spirits measures were switched to 25 mL and 35 mL because publicans needed precise, legally enforceable pour sizes — and optic dispensers were easy to replace with metric ones. Beer, however, had enormous cultural resistance: the "pint" is deeply embedded in British pub identity, and the Campaign for Real Ale lobbied hard. Parliament granted an explicit exemption allowing draft beer and cider to be sold by the imperial pint. Milk got a similar exemption. The result is a hybrid system where your gin is metric but your beer is imperial.
How many imperial fluid ounces are in a UK pint?
There are exactly 20 imperial fluid ounces in one UK pint (568 mL). In the US system, 1 pint = 16 US fluid ounces (473 mL).
Is the imperial fluid ounce still used?
The imperial fluid ounce is rarely used for commercial transactions in the UK today, which metricated in the 1990s. UK spirits servings are now legally defined in metric (25 mL or 35 mL).
Why is a UK shot 25 mL not one fluid ounce?
When the UK metricated bar measures, the 25 mL "metric measure" replaced older imperial measures. One imperial fl oz (28.41 mL) was not adopted because the EU standardized on 25 mL. So UK shots are not exactly one fl oz.
How many milliliters are in an imperial fluid ounce?
One imperial fluid ounce equals approximately 28.413 mL. One US fluid ounce equals approximately 29.574 mL. Both round to roughly "30 mL" in casual usage, but the precise difference matters in pharmacology.
US liquid quart – Frequently Asked Questions
How many cups are in a quart?
There are 4 US cups in one US liquid quart: 1 quart = 32 fl oz and 1 cup = 8 fl oz. The full chain: 2 cups = 1 pint, 2 pints = 1 quart, 4 quarts = 1 gallon.
How many milliliters are in a quart?
One US liquid quart equals approximately 946.4 mL (just under one liter). One imperial quart equals approximately 1,136.5 mL.
Why is motor oil sold in quarts in the US?
Most car engines require 4–6 quarts of oil per oil change, making the quart a practical single-container size. In metric countries, motor oil is sold in 1-liter or 4-liter containers.
How does a US quart compare to a liter?
One US quart (946 mL) is about 5.7% smaller than one liter (1,000 mL). Substituting 1 L for 1 qt adds about 54 mL — usually negligible in large-batch cooking.
What is the difference between a liquid quart and a dry quart?
A US liquid quart is 946.4 mL; a US dry quart is 1,101.2 mL — about 16% larger. Dry quarts are used for grain, produce, and dry goods. The distinction matters in agricultural and commercial contexts.