UrbiTools

How Many Cups in a Gallon?

16 cups in a gallon — US or UK. Convert gallons to cups and back instantly, with the right gallon for your recipe. Everything runs in your browser; nothing is uploaded.

Convert gallons ⇄ cups

Both gallons hold exactly 16 of their own cups — but a US cup and an imperial cup are different sizes.
16 US cups
1 US gal = 16 US cups (US gallon = 16 US cups)

Formula: 1 US gal × 16 = 16 US cups

How the gallons to cups conversion works

The ratio is exact: cups = gallons × 16. A US gallon is defined as 231 cubic inches and a US cup as 14.4375 cubic inches — 231 ÷ 14.4375 is exactly 16. The imperial system was built the same way: 1 imperial gallon = 4 imperial quarts = 8 imperial pints = 16 imperial cups.

Worked example: a recipe calling for 2 US gallons of stock needs 2 × 16 = 32 US cups. Going the other way, 40 US cups is 40 ÷ 16 = 2.5 US gallons.

The trap isn't the number 16 — it's the size of the cup. An imperial cup (≈ 284.1 ml) is a fifth larger than a US cup (236.588 ml), so 16 imperial cups is 4.546 litres while 16 US cups is only 3.785 litres. Match the gallon type to your recipe before measuring.

Cups in a gallon questions

How many cups are in a gallon?
16 cups — in both systems. A US gallon holds 16 US cups (2,304 fluid ounces' worth of volume), and an imperial (UK) gallon holds 16 imperial cups. The catch is that the two cups are different sizes: a US cup is 236.588 ml, an imperial cup is about 284.1 ml.
How many cups in half a gallon?
8 cups (half of 16). A gallon also breaks down neatly: 1 gallon = 4 quarts = 8 pints = 16 cups — each step doubles the previous one in both the US and UK systems.
Is a UK gallon the same as a US gallon?
No — the imperial gallon (4.54609 litres) is about 20% larger than the US liquid gallon (3.78541 litres). So 1 UK gallon is 16 imperial cups ≈ 4.546 litres, while 1 US gallon is 16 US cups ≈ 3.785 litres. Use the gallon-type switch above to match your recipe.
How many cups in 2 gallons?
32 cups (2 × 16). More examples: 1 quart = 4 cups, 1 pint = 2 cups, and a gallon of milk in the UK (1 imperial gallon) is 4.546 litres.
How do I convert cups back to gallons?
Divide by 16: gallons = cups ÷ 16. So 48 US cups is 48 ÷ 16 = 3 US gallons. Switch the direction above to do it.

More converters

mg to ml ConverterMilligrams to millilitres with density presets.ml to oz ConverterMillilitres to US fluid ounces and back.Liters to Gallons ConverterLitres to US or UK (imperial) gallons.Steps to km ConverterSteps to kilometres with adjustable stride length.cups to ml ConverterUS cups to millilitres and back.kg to lbs ConverterKilograms to pounds and back.Fahrenheit to Celsius ConverterFahrenheit to Celsius and back.grams to cups ConverterGrams to US cups with ingredient presets — flour, sugar, butter and more.ounces to grams ConverterOunces to grams and back — exact 28.3495 g per ounce.tablespoons to ml ConverterUS tablespoons to millilitres and back.teaspoons to ml ConverterUS teaspoons to millilitres and back.grams to tablespoons ConverterGrams to US tablespoons with ingredient presets.liters to quarts ConverterLitres to US quarts and back.cups to tablespoons ConverterUS cups to tablespoons and back — 16 tbsp per cup.tablespoons to teaspoons ConverterTablespoons to teaspoons and back — 1 tbsp = 3 tsp.pints to cups ConverterUS pints to cups and back — 1 pint = 2 cups.quarts to cups ConverterUS quarts to cups and back — 1 quart = 4 cups.grams to ml ConverterGrams to millilitres with ingredient presets.liters to pints ConverterLitres to US or UK pints — the pint of beer and milk.fluid ounces to cups ConverterFluid ounces to US cups and back — 8 fl oz per cup.teaspoons to cups ConverterTeaspoons to US cups and back — 48 tsp per cup.ml to liters ConverterMillilitres to litres and back — divide by 1,000.stone to kg ConverterStones to kilograms and back — exact 6.35029 kg per stone.

Sources & official guidance

Estimate only — check which gallon your recipe uses before measuring. See our disclaimer.