Gallons to Liters
Convert US gallons and UK (imperial) gallons to liters. Fast volume converter.
About the Gallons to Liters
Converting gallons to liters translates American or British volumetric liquid measurements into metric liters. The liter (L) is the global standard unit for liquid volume used in science, nutrition labels, and fuel dispensation worldwide.
To convert US gallons to liters, multiply by 3.785411784. To convert UK Imperial gallons to liters, multiply by 4.54609. One US gallon contains 4 liquid quarts, 8 liquid pints, or 128 fluid ounces (3,785.4 ml). One Imperial gallon contains 160 imperial fluid ounces (4,546.1 ml).
Whether calculating aquarium water volume, automotive oil capacities, home brewing batches, or international logistics freight, this tool eliminates guesswork between US and metric systems.
Converting a 55-gallon US home aquarium to metric liters: 55 US gallons × 3.78541 L/gal = 208.2 liters.
Tips for best results
- Remember: 1 US gallon = ~3.79 liters, while 1 Imperial gallon = ~4.55 liters.
- Water has a convenient metric density: 1 liter of pure water weighs almost exactly 1 kilogram (2.205 lbs). Therefore, 208 liters of water weighs approximately 208 kg.
- Double-check recipe sources; older vintage British cookbooks call for Imperial pints (568 ml) rather than American pints (473 ml).
How to use the Gallons to Liters
Why use Toolseza for Gallons to Liters?
Use this tool as often as you need with no paywalls, premium tiers, or hidden daily calculation quotas.
All calculations and file manipulations run inside your web browser. Your inputs are never sent to a cloud server.
Results update in real-time as you type or adjust settings, with instant one-click copy and export capabilities.
Works natively on smartphones, tablets, laptops, and desktop computers with zero installation or account creation.
Editorial Standards & Verification: All formulas, algorithms, and conversion factors implemented on Toolseza adhere to openly documented international standards (ISO, NIST, BIPM, W3C). Results are verified against benchmark reference datasets before publication.
Frequently Asked Questions
Is Gallons to Liters free to use?
Yes — Gallons to Liters is completely free, unlimited, and requires no sign-up.
How many gallons is 20 litres?
20 litres ÷ 3.78541 = 5.28 US gallons, or 20 ÷ 4.54609 = 4.40 UK imperial gallons.
How accurate is the conversion?
It uses the standard, internationally recognized conversion factor, so results are precise.
Does it work on mobile and tablet?
Yes — Gallons to Liters works on any modern browser, including mobile and tablet, no app required.