In U.S. customary units, 1 quart of oil equals 32 US fluid ounces (about 946 milliliters); in the British Imperial system, a quart is larger, about 1.1365 liters. The exact value depends on whether you’re using a US quart or an Imperial quart, and the context (cooking oil vs. engine oil) can influence how people think about quantities.
Unit definitions and context
Quarts are a volume unit that exists in two primary definitions used around the world: the US quart and the Imperial (British) quart. The US quart is a quarter of a US gallon, while the Imperial quart is a quarter of an imperial gallon. Below are the main equivalents for liquids in each system.
US quart (liquids)
The following figures apply to a US quart as used in baking, cooking, and many US applications.
- 1 US quart = 2 US pints
- 1 US quart = 4 US cups
- 1 US quart = 32 US fluid ounces
- 1 US quart = 64 US tablespoons
- 1 US quart = 192 US teaspoons
- 1 US quart ≈ 0.946352946 liters
These conversions are widely used in recipes, bottle sizes, and kitchen scales in the United States. When measuring engine oil or other automotive fluids, many containers list volume in quarts and liters as well; the unit is the same, but labeling and packaging may vary by region.
Imperial quart (UK and Commonwealth contexts)
For contexts using the British Imperial system, 1 imperial quart is larger than the US quart.
- 1 imperial quart = 2 imperial pints
- 1 imperial quart = 40 imperial fluid ounces
- 1 imperial quart = 1.1365225 liters
Note: The imperial cup and other smaller imperial measures are not as commonly used today for liquids, so it’s safest to rely on imperial fluid ounces and liters when working with imperial recipes or products.
Practical considerations
When you see a recipe or product listing for "1 quart of oil," check the region and the oil type. In US cooking contexts, this usually means 1 quart (32 fl oz, about 946 mL). In UK or Commonwealth contexts, confirm whether the listing uses imperial quarts (about 1.1365 L) or a local convention. For engine or motor oil, manufacturers often specify quart counts for fill levels, and in practice, customers may buy quarts in both US and UK sizes depending on the country.
Summary
1 quart of oil equals 32 US fluid ounces (about 946 milliliters) in the U.S. system, or about 1.1365 liters for the Imperial quart used in the UK. Always check whether the context is US customary or imperial, and whether the product refers to cooking oil, engine oil, or another liquid, to ensure correct interpretation.