The Conversion: 1 Quart = 0.946353 Liters

One US liquid quart equals 0.946353 liters. This is the standard quart used in American cooking, grocery stores, and everyday measurements. A quart is one-quarter of a US gallon.

• Quarts → Liters: Multiply by 0.946353 (e.g., 4 qt × 0.946353 = 3.785 L)
• Liters → Quarts: Divide by 0.946353, or multiply by 1.05669 (e.g., 2 L × 1.05669 = 2.113 qt)

Quick mental estimate: A quart is roughly 95% of a liter — almost the same. For quick approximations, treat 1 quart ≈ 1 liter. The actual difference is only about 5.4%, which is often negligible for casual use but matters in precise recipes and science.

Note on imperial quarts: The UK imperial quart is larger: 1 imperial quart = 1.13652 liters, about 20% more than a US quart. This converter uses the US liquid quart, which is the standard in American cooking and commerce.

Quarts to Liters Conversion Table

Common quart amounts converted to liters, with practical context for each:

Quarts in Cooking: Practical Applications

The quart is one of the most commonly used volume measurements in American cooking. Understanding its relationship to liters helps when following international recipes or buying cookware sold in metric sizes.

• Soups and broths: Most soup recipes call for 4–6 quarts of liquid (3.8–5.7 L). A standard box of chicken broth is 32 oz = 1 quart = 0.946 L.
• Slow cookers: Sized in quarts — a 6-quart slow cooker (5.7 L) is the most popular family size. European slow cookers are labeled in liters, so a 5.7 L cooker is the equivalent.
• Canning: Mason jars come in quart and pint sizes. A quart jar holds 946 mL (just under 1 liter). European preserving jars are typically 1 L — slightly more than a US quart jar.
• Beverages: A quart of milk or juice is a standard purchase size in the US. In metric countries, the equivalent is a 1-liter carton — about 5.4% more liquid.

When scaling recipes between US and metric measurements, the near-equivalence of quarts and liters (only 5.4% difference) means you can often substitute 1:1 for most cooking purposes. However, in baking and precision cooking, this 5.4% can accumulate — 4 quarts of water is 3.785 L, not 4 L. That 215 mL difference (nearly a cup) can matter in bread dough hydration or candy making where water ratios are critical.

US Quarts vs Imperial Quarts vs Dry Quarts

There are three different "quarts" you might encounter, and confusing them causes significant measurement errors:

The imperial quart is about 20% larger than the US liquid quart. This stems from the historical divergence between British and American measurement standards. Before 1824, the English gallon varied by commodity — there were wine gallons, ale gallons, and corn gallons. The British Weights and Measures Act of 1824 standardized the imperial gallon as 10 pounds of water at 62°F. The US, having gained independence before this standardization, kept the older English wine gallon as its standard — which happened to be smaller.

The US dry quart (1.101 L) is a separate unit used historically for measuring dry commodities like grain and berries at farmers' markets. It's derived from the dry gallon (4.405 L) and is about 16% larger than the liquid quart. In modern commerce, dry goods are almost always sold by weight, making the dry quart largely obsolete.

When converting recipes between American and British cookbooks, be aware that a British "quart" is 20% more than an American "quart." A British recipe calling for 2 quarts of stock means 2.27 liters, while an American recipe calling for 2 quarts means 1.89 liters — a difference of nearly 400 mL (about 1⅔ cups). This can significantly affect the consistency of soups, sauces, and braises.

Hydration and Sports: Quarts to Liters for Athletes

Athletes and coaches in the US often think in quarts and ounces, while sports science literature uses liters and milliliters. Converting between the two is essential for proper hydration planning.

• Daily hydration: The common "8 glasses a day" recommendation equals about 2 quarts (64 oz) = 1.893 liters. Sports medicine guidelines recommend 0.5–1 oz per pound of body weight — for a 160-lb runner, that's 80–160 oz = 2.5–5 quarts = 2.4–4.7 liters.
• During exercise: ACSM recommends 400–800 mL per hour of exercise. That's 0.42–0.85 quarts, or roughly 13.5–27 oz per hour.
• Sweat rate testing: Weigh before and after exercise — every pound lost = ~16 oz = 0.473 L of sweat. A runner losing 3 lbs in an hour has a sweat rate of about 1.42 L/hr (1.5 quarts/hr).
• Water bottles: Standard US water bottles: 16.9 oz (500 mL = 0.528 qt), 32 oz (946 mL = 1 qt), 64 oz (1.893 L = 2 qt). Many hydration packs hold 1.5–3 liters (1.6–3.2 quarts).

Marathon hydration strategy example: A runner with a 1.5 L/hour sweat rate running a 4-hour marathon needs approximately 6 liters (6.34 quarts) of fluid replacement. Accounting for typical aid station intake of 150–200 mL every 15–20 minutes, that's 2.4–3.2 L from aid stations plus whatever is carried. Knowing the quart-to-liter conversion helps American runners follow international sports nutrition research, which is almost exclusively published in metric units.

Electrolyte mixing is another area where precision matters. Many US electrolyte powders specify "mix with 1 quart of water," while international brands say "mix with 1 liter." The 5.4% volume difference means the US mix is slightly more concentrated. For competitive athletes carefully managing sodium intake during ultra-endurance events, this difference can affect palatability and absorption rates.

Liters to Quarts Reference Chart

For converting from liters to quarts, this reference table covers common metric volumes:

Automotive and Engine Fluids: Quarts and Liters

One of the most common real-world uses of the quart-to-liter conversion is in automotive maintenance. Engine oil, coolant, transmission fluid, and other automotive fluids are sold in quarts in the US and liters internationally.

Engine oil: A typical car engine holds 4–6 quarts (3.8–5.7 L) of oil. Oil is sold in 1-quart bottles in the US and 1-liter bottles in Europe. Since 1 quart = 0.946 L, buying "5 quarts" of oil gives you 4.73 L, while buying "5 liters" gives you 5.28 quarts. When your owner's manual (European car) says "4.5 liters oil capacity" and you're buying US quart bottles, you need 4.75 quarts — buy 5 quarts to be safe.

Coolant: Radiator systems typically hold 8–16 quarts (7.6–15.1 L) of coolant/water mixture. Coolant concentrate is mixed 50/50 with water, so a 12-quart system needs 6 quarts (5.68 L) of concentrate and 6 quarts of water. European vehicles specify coolant capacity in liters, while US specs use quarts.

Fuel economy: While fuel economy is measured in miles per gallon in the US and liters per 100 km in Europe, understanding the quart-liter relationship helps with quick conversions. 1 US gallon = 4 quarts = 3.785 L. A car getting 30 MPG uses 1 gallon per 30 miles, or 7.84 L/100 km.

For DIY mechanics working on imported vehicles, the quart-liter conversion is essential. Japanese, German, and Korean vehicle manuals specify all fluid capacities in liters. When shopping at a US auto parts store where everything is in quarts, knowing that 1 L ≈ 1.057 qt helps you buy the right amount without over- or under-purchasing.

History of the Quart and Liter

The word "quart" derives from the Latin "quartus" meaning "fourth" — it is one-quarter of a gallon. The quart has been used in English measurement since at least the 13th century, though its exact size varied regionally until standardization efforts in the 18th and 19th centuries.

The US liquid quart is based on the English wine gallon of 231 cubic inches, codified in the US in 1832. One-quarter of this gallon = 57.75 cubic inches = 946.353 mL. The British imperial quart, standardized in 1824, is based on the larger imperial gallon of 277.42 cubic inches, giving 69.355 cubic inches = 1,136.52 mL per imperial quart.

The liter was originally defined in 1795 during the French Revolution as the volume of 1 kilogram of pure water at 4°C (its maximum density). This made the liter exactly 1 cubic decimeter (1,000 cubic centimeters). In 1901, a more precise measurement of water's density led to a redefinition that made the liter slightly larger (1.000028 dm³), but in 1964, the liter was redefined back to exactly 1 dm³ = 1,000 cm³ = 0.001 m³. This is the definition used today.

The near-equivalence of quarts and liters (within 5.4%) is a coincidence of history — the English wine gallon and the metric system were developed independently, yet a quarter-gallon happens to be close to a cubic decimeter of water. This happy coincidence makes approximate conversions easy but can also lead to the false assumption that they're interchangeable, which they aren't for precise applications.