Volume Unit Converter

How to use this calculator

Volume field — Enter the quantity you want to convert. Decimals work fine. So do large numbers: 10,000 mL is a valid input.

From unit — Select the unit your value is currently in. The dropdown includes all supported units. Pick whatever your recipe, container label, or spec sheet uses.

To unit — The unit you want the result in. The primary converted result appears large in the output panel.

The result panel shows the converted value prominently, with five parallel readouts displayed simultaneously: mL, liters, US gallons, US cups, and US fl oz. These cover the most frequently needed cross-references without requiring additional conversions.

The container fill section below the result lets you calculate how many containers of a given size a volume fills — useful for batch cooking, brewing, and packaging calculations.

The problem this converter actually solves

Volume is the most unit-fragmented measurement in everyday life. A US recipe uses cups. A UK recipe uses ml and fluid ounces — but UK fluid ounces are different from US fluid ounces. A wine bottle is 750ml. A US “fifth” of spirits is 750ml too, but nobody calls it that anymore. A UK pint is 568ml. A US pint is 473ml. Same word. 20% more liquid.

Cooking databases, recipe apps, nutrition labels, and packaging specs each pick their preferred units without considering that you’re working across all of them simultaneously. The converter’s job is to eliminate the friction of switching between these systems.

The unit split that causes the most real-world confusion:

• US fluid ounce = 29.5735 mL
• UK (imperial) fluid ounce = 28.4131 mL
• US cup = 236.588 mL
• UK cup = 284.131 mL (used occasionally, not standard)
• US gallon = 3,785.41 mL
• UK (imperial) gallon = 4,546.09 mL

A recipe that says “1 gallon” means very different things depending on which country wrote it. The UK gallon is 20% larger than the US gallon. Over several gallons of a fermentation or brine recipe, that gap produces meaningfully different results.

The conversion formula

Every volume conversion is multiplication by a fixed factor. The converter uses liters as its internal base unit and converts all other units to and from liters.

Or equivalently:

The conversion factor between any two units is just the ratio of their liter equivalents. To find mL to US gallons: 0.001 liters per mL divided by 3.78541 liters per US gallon = 0.000264172 US gallons per mL.

You don’t need to memorize the factors. But knowing that the liter is the hub through which all other conversions route helps you verify results when something looks off.

Full unit reference table

Every supported unit with its exact liter equivalent and where it’s commonly used.

Unit	Symbol	In liters	Used for
Milliliter	mL	0.001	Medicine, recipes, nutrition labels
Centiliter	cL	0.01	Wine (10cL = standard glass)
Deciliter	dL	0.1	Nordic recipes, lab measurements
Liter	L	1.000	Beverages, fuel, general liquid
Cubic centimeter	cm³	0.001	Equivalent to mL — engineering, medical
Cubic meter	m³	1,000	Industrial, water systems, construction
US fluid ounce	fl oz	0.0295735	US recipes, beverage servings
US cup	cup	0.236588	US baking and cooking
US pint	pt	0.473176	US recipes, US beer servings
US quart	qt	0.946353	US recipes, large batch cooking
US gallon	gal	3.78541	US fuel, large volume cooking
UK fluid ounce	UK fl oz	0.0284131	UK recipes
UK pint	UK pt	0.568261	UK pub measure, UK recipes
UK quart	UK qt	1.13652	UK large-batch cooking
UK gallon	UK gal	4.54609	UK fuel, agricultural
Tablespoon (US)	tbsp	0.0147868	US recipes
Teaspoon (US)	tsp	0.00492892	US recipes, medicine

Note that cm³ and mL are exactly equal by definition. 1 cm³ = 1 mL. They’re used in different contexts (engineering vs cooking/medicine) but convert 1:1 with no factor needed.

Common conversions at a glance

From	To	Multiply by
Liters	mL	1,000
Liters	US fl oz	33.8141
Liters	US cups	4.22675
Liters	US gallons	0.264172
Liters	UK gallons	0.219969
mL	Liters	0.001
mL	US fl oz	0.033814
mL	US tsp	0.202884
mL	US tbsp	0.067628
US cups	mL	236.588
US cups	Liters	0.236588
US fl oz	mL	29.5735
US gallons	Liters	3.78541
UK gallons	Liters	4.54609
UK fl oz	mL	28.4131
UK pints	mL	568.261
US pints	mL	473.176

The UK-to-US pairs are the most practically important. A UK recipe calling for “1 pint of stock” means 568mL. A US recipe calling for “1 pint” means 473mL. Follow the wrong column in a brine or sauce recipe and you’re off by 20%.

Real-world examples

Scaling a recipe from cups to milliliters

A US recipe calls for 2.5 cups of milk. A kitchen scale in Europe measures in mL.

Brewing: converting a US gallon recipe to liters

A homebrewing recipe is written for 5 US gallons. The brewer’s kettle is marked in liters.

Medication dosing in mL vs teaspoons

A child’s medicine label says “give 10mL every 6 hours.” The measuring device only has teaspoon markings.

Fuel economy: liters to US gallons

A European car fills up 45 liters of fuel. A US friend wants to know how many gallons that is for cost comparison.

Cocktail batching for a party

A bartender is batching a negroni for 30 people. The original recipe is 1 fl oz each of gin, vermouth, and Campari (3 fl oz total per serve).

Industrial water: cubic meters to liters

A water treatment facility processes 2.4 m³ per minute.

The US vs UK volume problem in detail

The gap between US and UK volume units is where most recipe errors happen. Here’s the full picture.

The imperial system (UK) and the US customary system diverged in 1824 when Britain redefined its gallon. The US stuck with the older definition. Both systems kept the same names for units but assigned different values.

Unit	US volume	UK volume	Difference
Fluid ounce	29.5735 mL	28.4131 mL	UK is 4% smaller
Cup	236.588 mL	284.131 mL	UK is 20% larger
Pint	473.176 mL	568.261 mL	UK is 20% larger
Quart	946.353 mL	1,136.52 mL	UK is 20% larger
Gallon	3,785.41 mL	4,546.09 mL	UK is 20% larger

The cup divergence (20%) is the most consequential for cooking. UK recipes rarely use cups as a unit, which reduces the ambiguity — but US recipes exported to UK cookbooks or apps sometimes retain cup measurements without clarifying which cup standard.

When a recipe uses "cups," assume US unless explicitly stated otherwise. The US cup (236.6mL) is the global default in online recipes, food blogs, and cookbook publishing. UK sources that use cups typically specify "metric cup" (250mL) — which is a third, separate standard used mainly in Australia, Canada, and South Africa.

The Australian/Canadian metric cup (250mL) sits between the US cup and the UK cup. 250mL is a clean number that rounds nicely. The US cup at 236.6mL traces back to an old wine measure. Neither is more “correct” — they’re just different.

Volume in cooking: why precision matters and when it doesn’t

Baking is chemistry. The ratio of flour to liquid determines whether a loaf holds together, rises properly, and has the right crumb texture. A 20% error in liquid volume (the US-to-UK cup difference) can push a bread recipe from workable to unworkable.

Cooking (as opposed to baking) is more forgiving. Soups, stews, braises, and sauces tolerate volume variation. If a soup recipe calls for 2 cups of stock and you use 500mL instead of 473mL, nothing goes wrong. The 5.5% difference disappears into the natural variation of cooking.

A rough guide to when precision matters in volume measurement:

Critical to be exact: baked goods (bread, cake, pastry), pastry creams, ice cream bases, candy making, fermentation recipes (beer, wine, cider), medication dosing, chemical dilutions.

Approximate is fine: soups, stews, sauces, salad dressings, marinades, smoothies, most drinks.

Use weight instead of volume: For consistent baking results across different measuring environments, switch to grams. 100g of flour is 100g regardless of whether you’re using a US cup or a UK cup. This is why professional bakers and most European recipes use weight, not volume.

Common conversion mistakes

Using UK fluid ounces in a US recipe. A US recipe using “4 fl oz” means 118.3mL. If you convert assuming UK fl oz (113.7mL), the difference is small — 4mL across 4 fl oz — but it compounds across multiple ingredients and in precise baking it matters.

Confusing volume ounces with weight ounces. Fluid ounces measure volume. Weight ounces measure mass. 4 fl oz of water weighs approximately 4 weight ounces (because water density is close to 1 oz per fl oz at room temperature). 4 fl oz of honey weighs about 6 weight ounces because honey is denser. They’re different measurements and cannot be swapped.

Assuming 1 cup = 250mL universally. Only true for the metric cup (Australia, Canada, South Africa). The US cup is 236.6mL. For any recipe where the cup measurement was written by an American, use 236.6mL.

Using tablespoons without specifying country. US tablespoon = 14.79mL. UK/Australian tablespoon = 15mL. Close enough that it rarely matters, but if you’re measuring precise quantities of baking soda or other leavening agents, a recipe calls for a US tablespoon and you use a 20mL metric tablespoon (used in some countries), that’s a 35% dosing error.

The bottom line

Volume conversion is one multiplication by a fixed factor. The converter does it instantly and shows five additional reference values simultaneously so you’re not running five separate conversions for the same liquid.

The units that cause real problems are the US-versus-UK ones. The gallon, pint, quart, and fluid ounce all have different values in the two systems despite sharing names. The converter’s unit dropdown labels them clearly: “US gallons” and “UK gallons” are distinct selections.

For cooking and baking: check whether the recipe source is American, British, or Australian before deciding which cup or fluid ounce standard applies. For everything else, the conversion factors in the table above hold regardless of context.