Volume Converter

Volume converter: liters, gallons, cups, and cubic units

Volume measures three-dimensional space—liquids in recipes, tanks in HVAC specs, displacement in automotive manuals. Metric uses liters and milliliters; US customary uses cups, fluid ounces, and US gallons; UK imperial gallons are larger still.

Pick units explicitly before converting. A gallon in a US nutrition label is not the same as an imperial gallon on a UK fuel receipt.

How to use this converter

1. Select the volume unit you are converting from.
2. Enter the quantity.
3. Choose the output unit.
4. Copy for lab notes, shopping lists, or equipment sizing.

Before and after examples

Volume anchors—always confirm US vs imperial.

US gallon vs imperial gallon

US liquid gallon ≈ 3.785 liters. Imperial (UK) gallon ≈ 4.546 liters—about 20% larger. Fuel economy and brewery recipes have failed because someone picked the wrong gallon.

Fluid ounces differ too: US fl oz is about 29.57 mL; imperial fl oz is about 28.41 mL. The dropdown labels matter more here than in length.

Cooking, chemistry, and cubic measures

US cups: 1 cup ≈ 236.6 mL (legal cup definition varies slightly by context). Metric recipes use 250 mL “metric cups” in some countries—another reason to convert from the stated unit, not assume.

Cubic meters (m³) appear in HVAC and civil engineering; cubic centimeters (cc) match milliliters for small volumes. Engine displacement may list liters or cubic inches.

Dry vs liquid measure

US dry pints and liquid pints differ. Baking forums still argue about “packed” cups of flour. Volume converters handle the arithmetic; they cannot fix how tightly flour was scooped.

Frequently asked questions