Quarts to gallons and gallons to quarts converter

Quarts to gallons: four quarts make one gallon, so 10 qt = 2.5 gal. Type quarts and the gallons follow as you type, with pints, cups, fluid ounces and liters underneath; gallons to quarts works in the same box.

Example: Volume 10 · Direction: Quarts to gallons (qt → gal) → Answer: 10 qt = 2.5 gal. Source: NIST SP 811, Appendix B.8 – US fluid ounce = 29.5735295625 mL, US liquid quart = 0.946352946 L, gallon = 3.785411784 L (exact). Updated: 5 October 2026.

Volume

Direction

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Result

Answer: 10 qt = 2.5 gal
Smaller units and liters: In US pints: 20; cups: 40; fluid ounces: 320. In liters: 9.464 L (US) or 11.365 L (UK).
Working: 10 qt ÷ 4 = 2.5 gal
Conversion chart: qt gal
1 0.25
2 0.5
3 0.75
4 1
5 1.25
6 1.5
8 2
10 2.5
12 3
16 4
20 5
40 10
Volumes worth knowing: Volume qt gal
A pint 0.5 0.125
A half-gallon carton of milk 2 0.5
One gallon 4 1
Engine oil capacity of many cars, about 5 1.25
A 5-gallon bucket 20 5
A 10-gallon aquarium 40 10; 4 quarts = 1 gallon holds in both the US and the UK system. The sizes differ: a US gallon is 3.785411784 L, an imperial (UK) gallon 4.54609 L, 20 % more, and each UK quart is larger by the same share.

qt	gal
1	0.25
2	0.5
3	0.75
4	1
5	1.25
6	1.5
8	2
10	2.5
12	3
16	4
20	5
40	10

Volume	qt	gal
A pint	0.5	0.125
A half-gallon carton of milk	2	0.5
One gallon	4	1
Engine oil capacity of many cars, about	5	1.25
A 5-gallon bucket	20	5
A 10-gallon aquarium	40	10

How it is calculated

Divide by four

gallons = quarts ÷ 4 and quarts = gallons × 4. The name says it: a quart is a quarter of a gallon. So 6 qt = 1.5 gal, 3 qt = 0.75 gal and, back again, 2.5 gal = 10 qt.

The gallon ladder

Every step down doubles, except the last one: 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces. Put differently, a quart is 2 pints, 4 cups or 32 fl oz; a pint is 2 cups or 16 fl oz. Cooks remember it as the “Gallon Man” picture, a big G with four Qs, each holding two Ps, and each of those two Cs. The line under the answer climbs down that ladder for your number: In US pints: 20; cups: 40; fluid ounces: 320. In liters: 9.464 L (US) or 11.365 L (UK).

Which gallon?

The ratio of 4 is the same on both sides of the Atlantic, but the size is not. A US gallon is 3.785 L and an imperial gallon 4.54609 L, which makes a UK quart 1.137 L against 0.946 L. For 10 quarts the difference is 1.9 L. Cooking in the US means the 3.785 L gallon; fuel in the UK is sold in litres, but older cars and the mpg figure still use the imperial gallon.

Where the numbers come from

Cars: engine oil capacity is often 5 quarts, which is 1.25 gallons, so one 5-quart jug covers a full oil change.
Milk and juice: a half-gallon carton is 2 quarts, and three quart cans of paint are 0.75 gallons, one can short of a full gallon.
Aquariums and buckets: a 5-gallon bucket holds 20 quarts; a 10-gallon tank holds 40.

For liters and gallons see liters to gallons, for liters and quarts liters to quarts.

Frequently asked questions

How many quarts are in a gallon?

Four. 1 gal = 4 qt, and a gallon is also 8 pints, 16 cups or 128 fluid ounces.

How do I convert quarts to gallons?

Divide by 4. For 10 quarts: 10 qt = 2.5 gal.

How many gallons is 6 quarts?

6 qt = 1.5 gal, one and a half gallons.

How many quarts is half a gallon?

0.5 gal = 2 qt, the usual half-gallon milk carton.

Is a UK gallon the same as a US gallon?

No. Both have 4 quarts, but a US gallon is 3.785 L and a UK imperial gallon is 4.546 L, about 20 % larger.

Sources and legal basis

As of: 5 October 2026 · Editorial policy