Cooking Conversion Calculator

Cooking Conversion Calculator: convert cooking conversion instantly. Full formula, unit table, and worked example.

A volume converter switches between metric units (millilitres, litres, cubic metres), US customary units (fluid ounces, cups, pints, quarts, gallons), UK imperial units (UK pints and gallons differ from US), and cubic measurements (cubic inches, cubic feet). Volume measurement is essential in cooking, chemistry, fuel pricing, engineering, and everyday shopping — and the differences between US and UK standards cause constant confusion.

Key distinction: the US gallon (3.785 L) is smaller than the UK imperial gallon (4.546 L). US fluid ounce and UK fluid ounce are also different. A US recipe "cup" is 240 mL; a UK metric cup is 250 mL.

Enter the volume value and select the source unit — specify US or UK for gallons, pints, and fluid ounces.
The converter shows equivalents in metric, US customary, and UK imperial simultaneously.
For cooking: US cups (240 mL) are used throughout American cookbooks; metric-based recipes may use 250 mL as 1 cup.

Key volume conversion factors

1 US fluid ounce = 29.5735 mL | 1 UK fluid ounce = 28.4131 mL

1 US cup = 8 fl oz = 236.588 mL | 1 US pint = 2 cups = 473.176 mL

1 US gallon = 4 quarts = 8 pints = 3.78541 L | 1 UK gallon = 4.54609 L

1 litre = 1,000 mL = 33.814 US fl oz = 0.264172 US gallons

1 cubic foot = 28.3168 litres = 7.48052 US gallons

Volume conversion reference

Common volume benchmarks

Beverage cans: US standard 12 fl oz = 355 mL. Wine bottle: 750 mL = 25.36 fl oz. Beer keg (half barrel): 15.5 US gallons = 58.67 L. Fuel economy: 1 mpg (US) = 0.425 km/L = 235.2 L/100km; European fuel economy stated in L/100km (lower is better). A US car fuel tank: 12–18 US gallons = 45–68 L. Human daily water intake recommendation: 8 cups = ~1.9 L (US); 2–2.5 L (WHO general guidance).

Conversion tips and best practices

The US and UK cup differ: US cup = 240 mL, UK metric cup = 250 mL — for precision baking, weigh ingredients in grams rather than using cups.
When comparing international fuel economy: divide 235 by mpg (US) to get L/100km — a 35 mpg car uses 6.7 L/100km.
Metric litre and US liquid quart are close: 1 quart ≈ 0.946 L — close enough for informal cooking but not chemistry.
Cooking measurement equivalents: 1 tablespoon = 3 teaspoons = 14.79 mL (US); 1 cup = 16 tablespoons = 48 teaspoons.

Americans consume approximately 50 billion litres of bottled water per year — roughly 150 litres per person.
The US uses approximately 390 million gallons (1.48 billion litres) of gasoline per day — the largest national fuel consumption in the world.
An Olympic swimming pool holds approximately 2.5 million litres (660,000 US gallons) of water.

Common mistakes to avoid

Using US gallons for a UK recipe or vice versa — the 20% difference in gallon size can ruin large-batch cooking or brewing calculations.
Confusing fluid ounces (volume) with ounces (weight) — 1 fl oz of water weighs approximately 1 oz, but 1 fl oz of honey weighs about 1.5 oz.
Not specifying US vs metric cups in international recipes — this 4% difference matters in precision baking.

Volume measurement standards in commercial transactions are governed by NIST (USA) and national metrology institutes elsewhere. Fuel pump calibration, food labelling, and pharmaceutical volumes are subject to regulatory standards — consult applicable regulations for commercial applications.