How Many Cups in a Gallon?

There are 16 cups in a US gallon and 18.62 cups in a UK (imperial) gallon. The US gallon is the most commonly used measurement in recipes and cooking.

How many cups in a gallon? — see the answer and conversion table below.

Use the related converter below for custom values.

Formula

Answer: There are 16 cups in a US gallon and 18.62 cups in a UK (imperial) gallon. The US gallon is the most commonly used measurement in recipes and cooking.

Example

Question: How many cups in a gallon? Answer: There are 16 cups in a US gallon and 18.62 cups in a UK (imperial) gallon. The US gallon is the most commonly used measurement in recipes and cooking.

How to Use

  1. Read the direct answer at the top of the page
  2. Check the conversion table for common values
  3. Use the related converter for custom values
  4. Browse the FAQ for common follow-up questions

Frequently Asked Questions

How many cups are in a gallon of water?

There are exactly 16 US cups in 1 US gallon of water. This equals 3.785 liters or 128 fluid ounces.

Is a UK gallon the same as a US gallon?

No. A UK (imperial) gallon is 4.546 liters (about 18.62 cups), while a US gallon is 3.785 liters (16 cups). Always check which system your recipe uses.

How many cups are in a half gallon?

There are 8 cups in a half gallon (US). A half gallon equals 2 quarts or 1.893 liters.

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Author: Calczy Editorial Team Reviewed by: Calczy Editorial Team Last updated: 2026-09-16

This page was reviewed for accuracy by the Calczy editorial team. Our editorial process follows our editorial policy to ensure reliable, up-to-date conversion tools and reference content.