Gallons to Liters Converter
Convert US gallons to liters instantly. Free gal to L converter with formula, reference table, and no signup required.
What Is a Gallons to Liters Converter?
Converting gallons to liters is essential for comparing fuel costs across countries, sizing containers and tanks for international shipping, and following metric-based instructions for automotive, industrial, and agricultural products. Pool owners converting between US equipment manuals (gallons) and metric chemical dosing instructions (liters) use this conversion regularly. The conversion is also critical in the beverage industry, where production volumes are tracked in both systems.
The Conversion Formula
The formula to convert gallons to liters is:
Liters = Gallons × 3.78541
The reverse formula is: Gallons = Liters ÷ 3.78541
Gallons to Liters Reference Table
| Gallons (gal) | Liters (L) |
|---|---|
| 0.25 gal | 0.95 L |
| 0.5 gal | 1.89 L |
| 1 gal | 3.79 L |
| 1.5 gal | 5.68 L |
| 2 gal | 7.57 L |
| 3 gal | 11.36 L |
| 4 gal | 15.14 L |
| 5 gal | 18.93 L |
| 6 gal | 22.71 L |
| 8 gal | 30.28 L |
| 10 gal | 37.85 L |
| 12 gal | 45.42 L |
| 15 gal | 56.78 L |
| 16 gal | 60.57 L |
| 20 gal | 75.71 L |
| 25 gal | 94.64 L |
| 30 gal | 113.56 L |
| 40 gal | 151.42 L |
| 50 gal | 189.27 L |
| 100 gal | 378.54 L |
How to Use This Converter
- Enter your gallons value in the input field above.
- View the result — the liters equivalent appears instantly.
- For manual conversion, use the formula: Liters = Gallons × 3.78541.
- Check the reference table above for 20 pre-calculated common values.
Conversion Tips
- Multiply gallons by 3.8 for a quick estimate. 5 gallons is about 19 liters (actual: 18.93). For fuel purchases abroad, this helps you estimate cost when pump prices are displayed per liter.
- US gas prices are per gallon; European prices are per liter. To compare: multiply the per-liter price by 3.785. If gas is 1.80 euros/liter in Europe, that is equivalent to about $7.50/gallon - not a typo.
- The standard water recommendation of 8 glasses per day equals about 2 liters or 0.53 gallons. A gallon-a-day water challenge (3.8 liters) is nearly double the standard recommendation.
Related Conversions
- Liters to Gallons Converter
- Milliliters to Cups Converter
- Cups to Milliliters Converter
- Teaspoons to Milliliters Converter
- Tablespoons to Milliliters Converter
All conversions are calculated client-side in your browser. No data is sent to any server. For the authoritative source on unit definitions, see the National Institute of Standards and Technology (NIST).
Frequently Asked Questions
How many liters are in a gallon?
One US gallon equals 3.785 liters. For quick estimation, multiply gallons by 3.8. A 5-gallon container holds approximately 18.9 liters.
How many liters are in a gallon of milk?
A standard US gallon of milk contains 3.785 liters. A half-gallon carton holds 1.89 liters, and a quart holds 0.946 liters.
How do I compare gas prices between gallons and liters?
Divide the per-gallon price by 3.785 to get the per-liter price. For example, $3.50/gallon = $0.925/liter. Conversely, multiply the per-liter price by 3.785 to get the per-gallon equivalent.
What is a gallon in metric measurements?
One US gallon = 3.785 liters = 3,785 milliliters = 128 fluid ounces = 16 cups. The gallon is not an SI unit — it exists only in the US customary and Imperial measurement systems.
Results are calculated in your browser using standard formulas and are provided for reference only. For critical or high-stakes decisions, verify results with an authoritative source.
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