Convert US gallons to cups

1 gal (US)=15.7725cup

Use the converter below to change any US gallons value into cups instantly — with formula, conversion table, and real-world examples.

You have

Equals

15.77255

Conversion formula

Forward

cups = US gallons × 15.7725

Reverse

US gallons = cups × 0.0634

Example: 10 gal (US) × 15.7725 = 157.725 cup.

About both units

From

US Gallon

gal (US)

The US gallon equals 3.785411784 litres exactly. It is the standard fuel and liquid volume unit in the United States. A typical American car holds 14–18 US gallons of fuel. US fuel economy is quoted in miles per US gallon (mpg).

Real-world: US car tank ≈ 15 gallons (57 L). 1 US gallon of milk is a common grocery size (3.79 L). US paint often sold by the gallon.

Read full us gallon reference →

Cup

cup

The US cup equals 240 millilitres in common usage (legally defined as 236.588 ml). The metric cup (Australia, NZ) is 250 ml; the UK "cup" is 284 ml but rarely used in recipes. Cooking recipes from the US dominate online, so 240 ml is the safe default for "cup".

Real-world: 1 cup of water = 240 g = 240 ml. 1 cup of all-purpose flour weighs about 125 g. A Starbucks Tall is 12 fl oz = 1.5 cups.

Read full cup reference →

US Gallon to Cup conversion table

Common US gallons to cups values for quick reference.

US Gallon (gal (US))	Cup (cup)
1 gal (US)	15.7725 cup
2 gal (US)	31.5451 cup
5 gal (US)	78.8627 cup
10 gal (US)	157.725 cup
20 gal (US)	315.451 cup
50 gal (US)	788.627 cup
100 gal (US)	1,577.25 cup
200 gal (US)	3,154.51 cup
500 gal (US)	7,886.27 cup
1,000 gal (US)	15,772.55 cup

Tips & common mistakes

Quick tips

1 US gallon = 3.785 L = 128 US fluid ounces = 4 quarts.
Converting mpg (US) to L/100 km: 235.215 / mpg = L/100 km.
The US gallon is based on the old English Queen Anne wine gallon (1707).

Avoid these

Using UK gallons on a US fuel-economy figure — 30 mpg (US) = 36 mpg (UK).
Confusing US gallon (3.79 L) with UK gallon (4.55 L) — 20% difference.
Using "gallon" without qualifier in cross-Atlantic commerce.

Frequently asked questions

How many cups in a us gallon?

One us gallon equals 15.7725 cups.

How do I convert US gallons to cups?

Multiply the us gallon value by 15.7725 to get the equivalent in cups.

What is 100 US gallons in cups?

100 US gallons equals 1,577.25 cups.

Is a us gallon bigger than a cup?

Yes. 1 us gallon equals 15.7725 cups, so one us gallon is larger.

How to convert US gallons to cups without a calculator?

Multiply by 15.77 for a quick estimate; use a calculator for precise results.

Related volume conversions

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Convert US gallons to cups

🧮 Conversion formula