Free Online Volume Converter

A volume tool maps a value across litres, millilitres, US/UK gallons, fluid ounces, cups, pints, m³, in³ and ft³ — using millilitres as the pivot.

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Result
0.264172 gallon (US)
1 L = 0.264172 gallon (US)

How to Use This Converter

  1. Pick a From unit (note the US or UK suffix where it matters).
  2. Pick a To unit from the second dropdown.
  3. Type the value; the result and ratio display instantly.
  4. Tap the swap button to reverse the direction.

What Is a Volume Converter?

Volume conversion turns into a minefield the moment US and UK customary units meet. A US gallon is 3.78541 L; the UK Imperial gallon is 4.54609 L, almost 20% larger. US fluid ounces are 29.5735 ml; UK fluid ounces are 28.4131 ml. The same recipe printed on either side of the Atlantic refers to different amounts of liquid.

This tool tags every regional variant explicitly. Cooks scaling US recipes for a metric kitchen, brewers comparing UK and US gallon batches, fuel-economy nerds reconciling mpg-US against mpg-UK and engineers reading datasheets in cubic inches all need the right variant on both sides.

Internally everything normalises to millilitres, then converts to the target unit; the 1-to-1 factor is shown alongside.

Frequently Asked Questions

How many ml in a cup?
1 US cup = 236.588 ml. Metric cup = 250 ml. Check which standard you need.
Gallons to liters?
1 US gallon = 3.785 liters. 1 UK gallon = 4.546 liters.
What about fluid ounces?
1 US fl oz ≈ 29.57 ml. UK fl oz ≈ 28.41 ml. Specify your region for accuracy.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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