Volume Converter
Volume Conversion — Liters, Gallons, Cups, and More
Volume conversion is one of the most common needs in cooking, chemistry, brewing, medicine, and everyday life. The mix of metric and imperial systems — and the fact that the US and UK use different definitions for the same unit names — makes it easy to get wrong without a reliable converter.
Key Conversion Factors
Real-World Example
The default input is 1 liter, which converts to:
- Milliliters: 1,000 mL
- Fluid ounces (US): 33.81 fl oz
- Cups (US): 4.23 cups
- Pints (US): 2.11 pints
- Quarts (US): 1.06 quarts
- Gallons (US): 0.264 gallons
- Gallons (UK): 0.220 gallons
The US vs. UK Gallon Problem
The US gallon (3.785 L) and the UK/imperial gallon (4.546 L) are about 20% different — a meaningful gap that causes real confusion. The same confusion applies to pints: a US pint is 473 mL; a UK pint is 568 mL (the reason a UK pint of beer is noticeably larger).
This matters most for fuel economy comparisons. A car rated at 30 mpg in the UK would be rated at about 25 mpg in the US for the same vehicle, because UK miles per gallon uses the larger imperial gallon. Always check which gallon is being used when comparing international fuel economy figures.
Cooking Volume Conversions (US)
The US customary cooking system builds up logically from the teaspoon:
- 3 teaspoons = 1 tablespoon (14.79 mL)
- 2 tablespoons = 1 fl oz (29.57 mL)
- 8 fl oz = 1 cup (236.59 mL)
- 2 cups = 1 pint
- 2 pints = 1 quart
- 4 quarts = 1 gallon
These relationships are fixed — converting a recipe between metric and US cups is the most common kitchen use of this converter.
Frequently Asked Questions
Is a fluid ounce the same as a weight ounce?
No — they're completely different units that happen to share a name. A fluid ounce (fl oz) measures volume: 1 US fl oz = 29.57 mL. A weight ounce (oz) measures mass: 1 oz = 28.35 grams. One fluid ounce of water weighs approximately one weight ounce at room temperature, which is why the names are related — but a fluid ounce of honey, oil, or any other liquid has a different weight.
How do I convert a recipe from cups to milliliters?
1 US cup = 236.6 mL. For rough kitchen math: 1 cup ≈ 240 mL, 1/2 cup ≈ 120 mL, 1/4 cup ≈ 60 mL. For baking, using weight (grams) is more accurate than volume — a cup of flour can vary by 20% depending on how packed it is, while 125 grams of flour is always 125 grams.
How many liters in a standard water bottle?
The most common sizes: 500 mL (0.5 L) for single-serve bottles, 1 L and 1.5 L for larger bottles, and 2 L for the familiar large plastic bottle. A standard US water bottle sold in gyms and vending machines is typically 16.9 fl oz = 500 mL = 0.5 L. A gallon jug is 3.785 L = 128 fl oz.
What's the difference between a dry quart and a liquid quart?
In US measurement, dry and liquid quarts are slightly different: a liquid quart = 946 mL; a dry quart = 1,101 mL. This distinction matters in farming and produce contexts (dry quarts are used for berries, grains, etc.) but is rarely relevant in everyday cooking, where "quart" always means liquid quart.
How much is a standard drink in milliliters?
A standard drink in the US contains 14 grams of pure alcohol, which equals approximately: 355 mL (12 fl oz) of regular beer at 5%, 148 mL (5 fl oz) of wine at 12%, or 44 mL (1.5 fl oz) of spirits at 40%. Standard drink sizes vary by country — the UK, Canada, and Australia define them differently.