I need to buy 10 liters of paint. How many gallons is that?

10 liters ≈ 2.64 gallons. Most paint stores sell in 1, 5, and 55-gallon containers, so you'd buy a 5-gallon bucket.

My car's fuel tank is 15 gallons. How many liters is that?

15 US gallons ≈ 56.8 liters. That's a modest tank by US standards; SUVs and trucks often have 25+ gallon tanks. (Note: This converter uses US gallons; UK imperial gallons are larger.)

How do I estimate gallons to liters mentally?

Rough estimate: multiply by 4 (or 3.75 for better accuracy). Example: 5 gallons × 4 = 20 liters. For precision, multiply by 3.78541.

I'm filling a 30-gallon fish tank. How many liters is that?

30 gallons ≈ 114 liters. Large aquariums are often sold in metric sizes (100-120L), making them nearly equivalent to 25-30 gallon US tanks.

Gallons (gal) to Liters (L) Converter

Enter a value to instantly convert between volume units.

From

Precision4 dp

1 US Gallon = 3.7854 Liter

Key Formulas

Liter → US Gallon

gal = L × 0.264172

US Gallon → Liter

L = gal × 3.78541

US Cup → Milliliter

mL = cup × 236.588

Milliliter → US Cup

cup = mL × 0.00422675

Formula

liters = gallons × 3.78541

One US gallon equals 3.78541 liters. Whether you're comparing fuel efficiency when traveling abroad, filling a swimming pool, or checking beverage volumes, this conversion bridges US and metric measurements seamlessly across daily life applications.

Source: NIST SP 811, Table B.8

Frequently Asked Questions

Real-World Examples

Milk jug or paint can. US standard container; about 128 fluid ounces or 8 cups.

1 gal = 3.785 L

Typical car fill-up at a US gas station. Most people buy 5-15 gallons depending on tank size.

5 gal = 18.93 L

Half-full tank for a mid-size vehicle. A 20-gallon tank is typical for cars; 20-40 gallons for trucks.

10 gal = 37.85 L

Industrial barrel or emergency water storage. Standard for chemical storage and fuel containers.

55 gal = 208.2 L

liters to gallons cups to ml ml to cups fl oz to ml ml to fl oz

Gallons (gal) to Liters (L) Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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