Convert US Gallons to US Cups
US gallons to US cups is an all-American conversion with a clean, exact answer. One US gallon is exactly 16 US cups, so the number gets sixteen times bigger going from gallons to cups — no messy decimals, just multiply by 16.
US Gallons to US Cups conversion table
| US Gallons (gal) | US Cups (cup) |
|---|---|
| 1 | 16 |
| 2 | 32 |
| 3 | 48 |
| 5 | 80 |
| 10 | 160 |
| 20 | 320 |
| 50 | 800 |
| 100 | 1,600 |
| 500 | 8,000 |
| 1,000 | 16,000 |
The formula
To convert US gallons to US cups, multiply the number of US gallons by 16:
US cups = US gallons × 16
A worked example
Say you're making a big batch of lemonade and the recipe yields 3 US gallons — how many cups is that for serving?
3 × 16 = 48 US cups
So three gallons pours out to 48 cups.
Why it's a whole number
Unlike the metric-to-American conversions with their long decimals, this one stays inside the US customary system, where the cup is defined as exactly one-sixteenth of a gallon. That clean 1-to-16 ratio is why party and catering recipes scale so neatly between gallons and cups.
When you'll use it
Scaling batch drinks and punch from gallons down to cup servings, planning catering quantities, working out how many cup portions a gallon container holds, and stepping through the gallon-quart-pint-cup ladder when adjusting a recipe.
Frequently asked questions
How many US cups are in a US gallon?
Exactly 16 US cups. It's an exact, whole-number relationship: a US cup is defined as one-sixteenth of a US gallon. So a half gallon is 8 cups and a quart is 4 cups.
Does this hold for UK gallons and cups too?
No — this is the US system. A UK (imperial) gallon is larger and the UK doesn't use the same cup, so the tidy '16 cups to a gallon' rule is a US-only thing. Stick to US units on both sides.
How do gallons, quarts, pints, and cups line up?
In US units: 1 gallon = 4 quarts = 8 pints = 16 cups. Each step doubles, which makes scaling a recipe up or down easy to do in your head.