How Many Liters in a Gallon?

There are 3.785 liters in a US gallon and 4.546 liters in a UK (imperial) gallon. The US gallon is the standard used in American recipes and fuel measurements.

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

Use the related converter below for custom values.

Formula

Answer: There are 3.785 liters in a US gallon and 4.546 liters in a UK (imperial) gallon. The US gallon is the standard used in American recipes and fuel measurements.

Example

Question: How many liters in a gallon? Answer: There are 3.785 liters in a US gallon and 4.546 liters in a UK (imperial) gallon. The US gallon is the standard used in American recipes and fuel measurements.

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

Is a US gallon the same as a UK gallon?

No. A US gallon is 3.785 liters (128 fl oz), while a UK imperial gallon is 4.546 liters (160 fl oz). The UK gallon is about 20% larger.

How many liters in a half gallon?

There are 1.893 liters in a half gallon (US).

How many 500ml bottles in a gallon?

There are about 7.57 bottles of 500ml in 1 US gallon (3.785 / 0.5 = 7.57).

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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.