Convert Gallons to Liters

This page opens the volume converter preset to US gallons → liters. The US liquid gallon equals 3.78541 liters, so the formula is simply liters = gallons × 3.78541 — the tool computes with the full factor and rounds only for display.

Reference points: a gallon of milk is 3.79 liters, a 5-gallon bucket holds 18.9 liters, a typical 15-gallon car tank is 56.8 liters, and a 55-gallon drum is about 208 liters. You will reach for this direction when reading US product listings, pool and aquarium specs, or fuel figures in a metric country. Remember the UK gallon is a different, larger unit (4.54609 L).

Beyond gallons and liters, the full converter handles milliliters, fluid ounces, cups, pints, quarts and cubic meters, all in the browser with no server calls. Type in either field — the conversion works both ways — or press swap to flip to liters → gallons.