How Many Quarts in a Gallon?

Open the Quart Converter

What Is a Quart?

The word quart already gives the answer away. It comes from the Latin word quartus, meaning fourth, through Old French quarte, and a quart is a quarter of a gallon in every English measuring system since the medieval period, whatever size the gallon happened to be at the time. The quart is the workhorse size of the American kitchen and garage: milk and juice come in quarts and half gallons, motor oil is sold by the quart, and paint comes in quarts and gallons. It sits in the middle of the ladder, big enough to be useful and small enough to lift with one hand.

The Simple Math: Gallons to Quarts and Back

Converting in either direction takes one step and no decimals. To turn gallons into quarts, multiply by 4, so 3 gallons is 12 quarts and 5 gallons is 20 quarts. To go back the other way, divide quarts by 4, so 12 quarts is 3 gallons and 6 quarts is 1.5 gallons. A couple of anchor points cover most everyday math: half a gallon is 2 quarts, a quarter of a gallon is 1 quart, and an eighth of a gallon is 1 pint. Put as a plain question, how many quarts in 1 gallon is four, and how many quarts in 2 gallons is eight, because every gallon adds exactly four quarts.

Gallons to Quarts Conversion Chart

Most people do not need the formula. They need the number for the container in front of them, so this chart covers the sizes that show up in kitchens, garages, and stores, from a quarter gallon up to ten gallons. All values use US liquid measures, and the liter column is rounded to three decimals. The same chart works for quarts to gallons: find your quarts on the right and read the gallons on the left.

Gallons	Quarts	Liters
1/4 gallon	1 qt	0.946 L
1/2 gallon	2 qt	1.893 L
3/4 gallon	3 qt	2.839 L
1 gallon	4 qt	3.785 L
1 1/2 gallons	6 qt	5.678 L
2 gallons	8 qt	7.571 L
3 gallons	12 qt	11.356 L
5 gallons	20 qt	18.927 L
10 gallons	40 qt	37.854 L

Going the other way matters just as often, since oil, paint, and milk are sold by the quart. A few anchor points are worth keeping: 1 quart is a quarter gallon, 2 quarts is half a gallon, 8 quarts is 2 gallons, and 20 quarts is 5 gallons. Anything past 4 quarts is into whole gallons, so 16 quarts is 4 gallons and 40 quarts is 10 gallons.

How a Gallon Breaks Down Into Smaller Units

US liquid measures follow a neat halving pattern once you get past the first step. A gallon splits into 4 quarts, each quart splits into 2 pints, each pint splits into 2 cups, and each cup holds 8 fluid ounces. Multiply the chain, 4 x 2 x 2, and you land on 16 cups in a gallon, and 16 cups at 8 ounces each gives the 128 fluid ounces. For the full ounce side of this ladder, see our guide to how many ounces are in a gallon.

Measure	Per gallon	Per quart	Metric
1 gallon	1	1/4	3.785 L
1/2 gallon	2	1/2	1.893 L
1 quart	4	1	946 mL
1 pint	8	2	473 mL
1 cup	16	4	237 mL
1 fluid ounce	128	32	29.57 mL

A memory picture helps the ladder stick. Picture a big letter G for gallon, with 4 Qs inside it for quarts, 2 Ps inside each Q for pints, and 2 Cs inside each P for cups, a drawing often called the Gallon Man that holds the whole system in about ten seconds. The same idea works as a short rule: remember “4, 2, 2”, a gallon has 4 quarts, a quart has 2 pints, and a pint has 2 cups, then multiply along the chain to get 16 cups in a gallon. Once you hold that chain, most kitchen conversions take seconds and no calculator.

US Liquid, Imperial, and Dry: Three Different Quarts

Here is where most wrong answers come from. Every system below has 4 quarts in a gallon of its own kind, but the quarts themselves are different sizes, and the trouble starts when you mix a quart from one system with a gallon from another. A British recipe and a US milk jug use different gallons, so the liter values do not match, and one imperial gallon equals about 4.8 US quarts, not 4.

System	Gallon	Quart	Quarts per gallon
US liquid	3.785 L (231 cubic inches)	0.946 L	4
Imperial (UK, older Canadian)	4.546 L	1.137 L	4
US dry	4.405 L (268.8 cubic inches)	1.101 L	4

The figures above match the conversion factors in the NIST Guide to the SI, Appendix B, which gives 3.785412 L for the US gallon, 4.54609 L for the imperial gallon, 0.9463529 L for the US liquid quart, and 1.101221 L for the US dry quart. The dry quart is the one people trip over at the farm stand: it is about 16 percent larger than a liquid quart, and it survives on berry baskets and produce, because berries have air gaps and do not settle like water does. A dry quart of blueberries holds more than a quart of milk, and pouring a liquid quart of water into a dry quart basket will not fill it.

There is one more trap hiding in the word cup. An imperial pint holds 20 imperial fluid ounces against the US pint's 16, and an imperial cup is about 284 mL against the US cup's 237 mL. That means the claim you sometimes see, that every system has 16 cups in a gallon, is only true if you keep each system's own cup. Mix a US cup into an imperial gallon and the count breaks, so always check which system a recipe or label means before you measure anything.

How Many Quarts in a Gallon of Water?

Water does not change the count, because a quart and a gallon are both volumes. There are 4 quarts in a gallon of water, the same as in a gallon of anything else, and what changes with water is the weight. A US gallon of water weighs about 8.34 pounds at room temperature, so one quart weighs about 2.09 pounds. Hikers think in quarts for exactly this reason, since it is easier to spread the weight in a pack than to carry a single heavy jug.

The quart also makes hydration tracking simple. A standard 32 ounce water bottle is exactly one quart, so four refills make a gallon. The National Academies puts adequate total water intake, from food and drink together, at about 3.7 liters a day for men and 2.7 liters for women, and most people get roughly a fifth of that from food. A full gallon of drinking water is more than most adults need, so count in quarts and spread it through the day.

How Many Quarts in a Gallon of Milk?

A US gallon of milk holds 4 quarts, the same as any other liquid, and a half gallon of milk holds 2 quarts. Milk is sold in all three sizes in American stores, quart, half gallon, and gallon, which is why the dairy aisle is the best place to see the ladder in real life. Watch the size on the label before you compare prices, because the half gallon has been shrinking: many juice and milk brands now sell 52 ounce or 59 ounce bottles that look like half gallons but hold less than the 64 ounces a true half gallon needs. Ice cream has done the same thing, with many half gallon tubs quietly dropping to 1.5 quarts, which is 25 percent less in the same looking container. A full gallon of ice cream is 4 quarts, so a 1.5-quart tub is well short of even a half gallon.

Quarts in the Kitchen

Big batch cooking runs on quarts. A standard stockpot is usually 8, 12, or 16 quarts, so a 12 quart pot holds exactly 3 gallons of liquid, and knowing that helps you scale a soup or a brine without guessing whether it will overflow. Saucepans are sized the same way, a 4 quart pan holds a gallon and makes the standard family stockpot size, and slow cookers follow the pattern too, with the common sizes running 3, 6, and 8 quarts. Scaling a recipe is where the quart earns its place: if a soup makes 2 quarts and you need to feed twice as many people, you double it to 4 quarts, which is exactly one gallon.

Dry and liquid quarts part company in the kitchen, and baking is where it matters. A liquid quart measure is for things you pour, while dry ingredients belong in dry measures or, better, on a scale, because a cup of flour weighs closer to 4.5 ounces and does not pack evenly. If a recipe says dry quart, it means the bigger 1.101 liter measure, and swapping in a liquid quart will leave you short. When a recipe just says quart with no word in front of it, it means the liquid quart almost every time.

Quarts in the Garage: Motor Oil

Motor oil is almost always sold by the quart, and that is no accident. Most passenger cars take about 4 to 6 US quarts of engine oil during a routine oil and filter change, which is one to one and a half gallons. Buying by the quart lets you top up exactly what the engine needs without opening a gallon jug you will not finish. A gallon of oil is 4 quarts, so a 5-quart change takes a gallon plus one more quart.

Vehicle type	Typical oil capacity (with filter)
Compact car (4-cylinder)	3.5-5 quarts
Midsize sedan	4.5-6 quarts
SUV	5.5-8 quarts
Pickup truck	6-9 quarts
Diesel truck	8-12 quarts

These are general ranges, not specifications, and the exact figure lives in your owner's manual. Two cars with the same engine size can need different amounts, because the oil pan shape, the filter size, and the model year all change the capacity. A V8 Mustang GT takes about 8 quarts while a small four cylinder car takes about 4.5, so check the manual before you buy. Overfilling is just as bad as underfilling, since too much oil can foam and leak, so pour in most of it, check the dipstick, and add the last quart slowly.

How Much Paint Does a Quart Cover?

A quart of paint covers about 75 to 125 square feet in one coat on a smooth, primed surface, depending on the finish, which is roughly a quarter of a gallon's 350 to 400 square feet. That is enough for a closet, an accent wall, a door, or the trim in a small room, and two coats cut the area roughly in half. Flat paint stretches furthest because it hides the surface well, while gloss covers the least because it lays down a thicker, shinier film. A gallon of paint is 4 quarts, so the table below is the per-quart version of the gallon figure.

Paint finish	Coverage per quart, one coat
Flat / matte	100-125 sq ft
Eggshell	90-110 sq ft
Satin	85-105 sq ft
Semi-gloss	80-100 sq ft
Gloss	75-95 sq ft

Bare wood, textured walls, and unprimed drywall all drink more paint, so a quart will not go as far on those. Measure the wall, width times height, subtract about 20 square feet for each door and 15 for each window, and compare the result with the table. If the number lands just over a whole quart, buy the gallon, since it is usually better value anyway.

Mixing Cleaners: Dilution per Quart

Cleaning concentrates are the other place quarts do daily work. Labels give doses per gallon, but most people mix in a quart spray bottle, so the gallon number has to be divided by four. The rule is simple: divide 32 by the second number of the ratio and you get the ounces of concentrate for one quart bottle.

Dilution ratio	Concentrate per quart (32 oz) bottle	In teaspoons
1:256	0.125 fl oz	3/4 tsp
1:128	0.25 fl oz	1 1/2 tsp
1:64	0.5 fl oz	1 tbsp
1:32	1 fl oz	2 tbsp
1:16	2 fl oz	4 tbsp

So a bottle marked 1:128 needs just a quarter ounce of concentrate in a quart spray bottle, and a 1:64 product takes half an ounce. Always follow the label on your own product over any chart, since disinfectants only work at the strength they were tested at, and the surface must stay wet for the contact time on the label. Pour the water in first, then add the concentrate, so the mix does not foam up and throw your quart count off.

How to Measure a Quart Correctly

Measuring a quart sounds foolproof, but small habits throw the number off. Start with a proper liquid measuring jug, not a dry ingredient cup, since the two are shaped differently and read differently. Set the jug on a flat, level surface, because a tilted counter quietly adds or steals ounces, then pour and bend down to read the bottom of the meniscus, the curved surface of the liquid, at eye level. There is a simple field test if you doubt your jug: fill a 32 fluid ounce quart measure four times and pour each one into the gallon container, and four full quarts should land exactly on the gallon line, since 4 x 32 = 128. If the level sits off the mark, the jug is wrong, not the math, and it is time to replace it.

Common Mistakes to Avoid

Most conversion errors come from a short list of mix-ups. The first is using 4 quarts for a British source without checking the size, when the imperial quart is about 20 percent bigger than the US one. The second is treating dry and liquid quarts as the same thing, which only works until you measure produce or bake with it.

The third is treating fluid ounces and weight ounces as the same thing. A quart of water weighs about 2.09 pounds, but a quart of honey weighs far more and a quart of gasoline weighs far less, because weight depends on density and volume does not. The fourth is treating a liter as a quart, since a liter is about 1.057 US quarts and four liters is about 4.23 quarts, slightly more than a gallon. Slow down for one second, check which unit and which system you are holding, and the math almost always takes care of itself.

Quick Recap

• One US liquid gallon = 4 US liquid quarts = 8 pints = 16 cups = 128 fluid ounces.
• One US liquid quart = 2 pints = 4 cups = 32 fluid ounces = about 0.946 liters.
• One imperial gallon also has 4 imperial quarts, but each is bigger, so it equals about 4.8 US quarts.
• One US dry quart is about 1.101 liters, roughly 16 percent larger than a liquid quart.
• A quart of water weighs about 2.09 lb; a gallon of water weighs about 8.34 lb.
• Most cars take 4 to 6 quarts of oil; a quart of paint covers about 75 to 125 sq ft in one coat, depending on the finish.
• Going gallons to quarts, multiply by 4; going quarts to gallons, divide by 4.

Frequently Asked Questions

How many quarts are in a gallon?

There are 4 quarts in a US gallon, and 4 imperial quarts in an imperial gallon. The count is the same in both systems, but the imperial quart is about 20 percent larger, so one imperial gallon equals about 4.8 US quarts.

How many quarts in a half gallon?

Two quarts. A half gallon is 2 quarts, which is also 4 pints, 8 cups, or 64 fluid ounces. Half gallon jugs of milk and juice hold two quarts.

How many quarts in a gallon of milk?

A US gallon of milk holds 4 quarts, the same as any other liquid. A half gallon of milk holds 2 quarts, but check the label, since some brands now sell 52 or 59 ounce bottles that look like half gallons.

How many cups are in a quart?

There are 4 cups in a US liquid quart, because a quart is 2 pints and each pint is 2 cups. That also makes a quart 32 fluid ounces.

How many ounces are in a quart?

There are 32 fluid ounces in a US liquid quart. An imperial quart holds 40 imperial fluid ounces, and the imperial fluid ounce is slightly smaller than the US one.

Is a quart bigger than a liter?

No, a liter is slightly bigger. One liter is about 1.057 US quarts, so a US quart is about 5.4 percent smaller than a liter. An imperial quart is about 1.137 liters, so it is bigger than a liter.

What is a dry quart?

A US unit for produce, equal to about 1.101 liters, roughly 16 percent larger than a liquid quart. Berries, tomatoes, and shellfish are sold by the dry quart, which is why a quart basket of blueberries holds more than a quart of milk.

How many quarts of oil does a car need?

Most passenger cars take 4 to 6 quarts for an oil and filter change. Compact cars take about 3.5 to 5 quarts, SUVs about 5.5 to 8, and diesel trucks about 8 to 12. Always check your owner's manual for the exact figure.

How many quarts are in 5 gallons?

There are 20 quarts in 5 US gallons, because each gallon holds 4. That is about 18.93 liters, or 40 pints and 80 cups.

Numbers on this page follow the official definitions in NIST Handbook 44 and the UK Weights and Measures Act 1985.