Simple Converter

Volume Converters

Convert between liters, milliliters, US gallons, cups, and fluid ounces — with the exact 231-cubic-inch gallon definition.

Volume converter

1 L = 0.264172 gal

All volume converters

Liters to Gallons

1 L = 0.264172 gal

Gallons to Liters

1 gal = 3.78541 L

mL to Cups

1 mL = 0.00422675 cup

Cups to mL

1 cup = 236.588 mL

Fl Oz to mL

1 fl oz = 29.5735 mL

About volume units

Metric volume is simple: the liter (one cubic decimeter) and the milliliter. The US customary side is built on the US liquid gallon, legally defined as exactly 231 cubic inches — which makes it exactly 3.785411784 liters. From the gallon descend the fluid ounce (1⁄128 of a gallon) and the cup (8 fluid ounces).

Watch out in recipes: the US customary cup (236.59 mL) is not the same as the US legal cup used on nutrition labels (240 mL), and both differ from the metric cup (250 mL) used in Australia. The converters here use the US customary definitions and say so on every page.