Why "UK" is in the name
UK Imperial and US customary volume units use different definitions for gallons, quarts, pints, and fluid ounces. A UK Imperial gallon is exactly 4.54609 liters, while a US gallon is exactly 3.785411784 liters.
An Imperial gallon contains 4 quarts, 8 pints, and 160 Imperial fluid ounces, so these units are different from their US counterparts. This converter uses UK Imperial definitions for these larger volume units. For US measurements, use our US Volume Converter.
UK tablespoon and teaspoon measurements
UK cooking measurements commonly use a 15 mL tablespoon and a 5 mL teaspoon. This converter uses those values for its UK tablespoon and teaspoon options.
These cooking measures should not be confused with historical Imperial tablespoon and teaspoon definitions, which were derived from the Imperial fluid ounce. Older recipes or reference materials may use different definitions, so check the source when working with historical measurements.
UK and metric conversion factors
| Unit | Equal to |
|---|---|
| 1 cubic meter (m³) | 1,000 liters |
| 1 cubic centimeter (cm³) | 1 milliliter |
| 1 liter | 1,000 milliliters |
| 1 gallon (UK) | 4.54609 liters |
| 1 quart (UK) | 1/4 gallon — 1.1365225 liters |
| 1 pint (UK) | 1/8 gallon — 0.56826125 liters |
| 1 fluid ounce (UK) | 1/3160 gallon — 28.4130625 mL |
| 1 tablespoon (UK, modern) | 15 mL |
| 1 teaspoon (UK, modern) | 5 mL |
| 1 cubic foot | 1,728 cubic inches (12³) |
Frequently asked questions
How many liters are in a UK gallon?
Exactly 4.54609 liters.
Is an Imperial gallon bigger than a US gallon?
Yes. An Imperial gallon is 4.54609 liters, while a US gallon is 3.785411784 liters.
How many fluid ounces are in a UK gallon?
An Imperial gallon contains 160 Imperial fluid ounces. A US gallon contains 128 US fluid ounces.
How many milliliters are in a UK tablespoon?
A standard UK cooking tablespoon is 15 mL. This is a modern UK cooking measure and is different from the historical Imperial tablespoon derived from the Imperial fluid ounce.