Convert between gallons, liters, cups, fluid ounces, tablespoons, teaspoons, and milliliters instantly. Essential for cooking, fuel, beverages, and liquid measurements.
Most commonly needed liquid volume conversions
Enter any liquid volume in gallons, liters, cups, ounces, or milliliters and get accurate conversions across all units.
Open Unit Converter →Our volume converter covers all major liquid measurement systems:
Metric: milliliters (mL), centiliters (cL), deciliters (dL), liters (L)
US customary: teaspoons (tsp), tablespoons (tbsp), fluid ounces (fl oz), cups, pints, quarts, gallons
Imperial (UK): Imperial fluid ounces, pints, and gallons (different from US!)
Key warning: US and UK gallons are different. 1 US gallon = 3.785 L, but 1 UK Imperial gallon = 4.546 L — about 20% larger. Similarly, US and UK fluid ounces differ slightly (US fl oz = 29.57 mL; UK fl oz = 28.41 mL).
Cooking is the most common reason people need volume conversions. International recipe sites often mix systems. Here's the complete US cooking measurement ladder:
1 teaspoon = 4.93 mL ≈ 5 mL
1 tablespoon = 3 teaspoons = 14.79 mL ≈ 15 mL
1 fluid ounce = 2 tablespoons = 29.57 mL ≈ 30 mL
¼ cup = 4 tablespoons = 59.15 mL ≈ 60 mL
⅓ cup = 5⅓ tablespoons = 78.86 mL ≈ 79 mL
½ cup = 8 tablespoons = 118.3 mL
1 cup = 16 tablespoons = 8 fl oz = 236.6 mL
1 pint = 2 cups = 473.2 mL
1 quart = 4 cups = 946.4 mL
1 gallon = 16 cups = 3.785 L
For travelers between the US and countries using the metric system, fuel pricing can be confusing. Gas stations in Europe, Canada, Mexico, and most of the world price fuel per liter, while the US prices per gallon.
If you see a gas price of €1.70/liter in Europe, the per-gallon equivalent is: 1.70 × 3.785 = ~€6.44/gallon. This often surprises American travelers who see what appears to be a "low" per-liter price.
Car fuel tank conversions: 50 L tank = 13.2 gallons | 60 L = 15.9 gal | 70 L = 18.5 gal | 20-gallon tank = 75.7 L
Beverage containers mix metric and imperial labeling. US containers often show both, but knowing conversions helps:
12 fl oz can = 355 mL (standard US soda/beer can)
16 fl oz = 473 mL ("pint" glass, though a US pint is also 473 mL)
20 fl oz = 591 mL (common US bottle size)
32 fl oz = 946 mL (just under 1 liter)
1 liter = 33.8 fl oz | 500 mL = 16.9 fl oz | 750 mL = 25.4 fl oz (wine bottle)
Aquarium sizing is typically stated in gallons in the US but liters internationally. Common fish tank sizes:
5 gallon = 18.9 L (nano tank) | 10 gallon = 37.9 L (starter tank) | 20 gallon = 75.7 L
55 gallon = 208 L | 75 gallon = 284 L | 125 gallon = 473 L
Water changes (typically 10–25% weekly): 20-gallon tank → 2–5 gallon change = 7.6–18.9 L. Knowing the liter equivalent helps when using metric water conditioners dosed in mL per liter.
Concrete mixing uses volume ratios (cement:sand:aggregate) and water is measured in gallons or liters depending on region. A standard bag of Portland cement yields about 0.6 cubic feet = 17 liters of mixed concrete when properly hydrated. One cubic yard of concrete = 201.97 gallons = 764.6 liters of material volume.
1 US gallon = 3.785 liters. Multiply gallons by 3.785 for liters. 1 UK Imperial gallon = 4.546 liters — 20% bigger. Important distinction when working internationally.
1 US cup = 236.6 mL. UK/AU cup = 250 mL. Most international recipes use 250 mL per cup. 1 liter = 4.227 US cups = 4 international cups.
1 liter = 33.814 US fluid ounces. 1 fl oz = 29.57 mL. A 16 oz bottle = 473 mL. A 20 oz bottle = 591 mL. A 32 oz bottle ≈ 946 mL (nearly 1 liter).
1 tsp ≈ 5 mL | 1 tbsp ≈ 15 mL | ¼ cup = 60 mL | ½ cup = 118 mL | 1 cup = 237 mL. 3 teaspoons = 1 tablespoon. These rounded values are accurate enough for cooking.