Volume Converter

Volume Converter

Convert between milliliters, liters, US gallons, quarts, pints, cups, fluid ounces, tablespoons, and teaspoons instantly. Volume conversions are some of the trickiest unit conversions because the same unit name — like “pint” or “fluid ounce” — means different things in the US versus the UK. This converter uses US customary measurements throughout, which is the standard for most online recipes and product specs in North America. Knowing the exact conversion factor matters whether you are scaling a cocktail recipe, calculating the capacity of a fuel tank, or ordering the right size container for a liquid product.

How Volume Conversion Works

All conversions route through milliliters (mL) as the base unit. The formula is: Result = Value x (source unit in mL) / (target unit in mL). The exact mL equivalents for each US unit are:

• 1 teaspoon = 4.92892 mL
• 1 tablespoon = 14.7868 mL (3 teaspoons)
• 1 fluid ounce = 29.5735 mL (2 tablespoons)
• 1 cup = 236.588 mL (8 fluid ounces)
• 1 pint = 473.176 mL (2 cups)
• 1 quart = 946.353 mL (2 pints)
• 1 US gallon = 3,785.41 mL (4 quarts)
• 1 liter = 1,000 mL

For example, to convert 2.5 cups to milliliters: 2.5 x 236.588 = 591.47 mL.

Worked Examples

A baker is scaling a cookie recipe from 24 to 60 servings — a 2.5x increase. The original recipe calls for 1/3 cup of vanilla extract. Scaling up: 1/3 x 2.5 = 0.833 cups. Converting to tablespoons for easier measuring: 0.833 x 236.588 / 14.7868 = 13.3 tablespoons, or 13 tablespoons plus 1 teaspoon. That is a specific, measurable amount that does not require a second set of calculations.

A homeowner is filling a swimming pool and wants to know how many gallons of muriatic acid to add for the initial pH treatment. The treatment chart shows 1 liter per 10,000 gallons of water. The pool holds 15,000 gallons. First, convert pool volume to liters: 15,000 x 3,785.41 / 1,000 = 56,781 liters. Then: 56,781 / 10,000 = 5.68 liters of acid, which they round up to 6 liters to buy one full-bottle margin.

A traveler in Europe orders a 330 mL bottle of beer and wonders how it compares to a US 12 fl oz bottle. Converting 330 mL to fluid ounces: 330 / 29.5735 = 11.16 fl oz. The European bottle is about 7% smaller than a US standard bottle — close but not identical, which matters if they are calculating alcohol intake against US-standard drink guidelines.

Reference Conversion Table

When to Use This Converter

• Cooking with international recipes — European, Australian, and UK recipes almost always list liquid ingredients in milliliters and liters, not cups and tablespoons; this converter handles those exact conversions
• Scaling recipes up or down — when multiplying a recipe by a non-round number (like 2.5x), converting to mL first makes the math cleaner, then converting back to measurable units at the end
• Fuel and automotive calculations — gas tanks in Canada and Europe are sized in liters; a 60-liter tank holds 15.85 US gallons; knowing this helps plan fuel stops on cross-border road trips
• Homebrewing and fermentation — brew recipes are commonly written in metric (liters) but US homebrewers use gallon fermenters; converting accurately affects yeast pitch rates, hop additions per liter, and final ABV calculations
• Medication and infant feeding — liquid medication doses in the US may be listed in mL or teaspoons; 5 mL = 1 teaspoon exactly, and confirming this prevents dosing errors

Common Mistakes to Avoid

1. Mixing up US and Imperial (UK) gallons — a UK Imperial gallon is 4,546.09 mL, about 20% larger than a US gallon (3,785.41 mL). A recipe or product spec written for UK measurements will be significantly off if you apply US gallon conversions. Always confirm which gallon is intended.
2. Confusing fluid ounces and weight ounces — a fluid ounce measures volume (29.57 mL) while a weight ounce measures mass (28.35 g). Water happens to make these nearly equal in practice, but honey (which is denser) fills 1 fl oz at more than 1 oz by weight. Never use fluid ounce conversions for weight calculations.
3. Assuming 1 cup = 250 mL — the exact value is 236.59 mL. When making a single recipe this matters little, but when scaling to restaurant quantities (say, 50 batches) the difference is 50 x 13.4 mL = 670 mL, or nearly 3 extra cups of ingredient error.
4. Forgetting that 1 tablespoon = 3 teaspoons — when a recipe calls for a fractional tablespoon (like 1.5 tbsp), people sometimes convert incorrectly to 4 teaspoons instead of the correct 4.5 teaspoons. Always verify the tbsp-to-tsp relationship is 1:3, not 1:4.

Quick Reference Benchmarks

These six numbers cover 90% of everyday volume conversions:

• 1 tsp = 5 mL (close enough for cooking; exact is 4.929 mL)
• 1 tbsp = 15 mL (close enough; exact is 14.787 mL)
• 1 cup = 237 mL (or roughly 240 mL for mental math)
• 1 liter ≈ 4.2 cups (exact: 4.227 cups)
• 1 US gallon = 3.785 liters (or “about 3.8 liters”)
• 5 mL = 1 medical teaspoon — used on drug labels; always safe to use this exact figure

Tips

1. When halving or doubling a recipe, convert all volume measurements to mL first, do the arithmetic, then convert back to the most practical measuring unit — this prevents awkward fractions like 3/8 cup
2. A US liquid pint (473 mL) and a US dry pint (551 mL) are different units; in cooking, “pint” almost always means liquid pint unless you are measuring dry produce like blueberries
3. For fuel efficiency calculations comparing US and European cars, divide liters per 100 km by 3.785 and then divide 100 by that result to get miles per gallon: L/100km to mpg = 235.21 / (L/100km)
4. Water weighs 1 gram per mL at 4 °C (and approximately 1 g/mL at room temperature), so for water-based liquids you can treat mL and grams as interchangeable for quick estimates
5. If a cocktail recipe is written in centiliters (cl) — common in European bar guides — note that 1 cl = 10 mL; a 4 cl shot is 40 mL, which is 1.35 fl oz
6. For home canning and preserving, jar sizes are listed in ounces (fl oz) and quarts in the US; convert metric-sourced yield estimates to quarts to know how many jars you need before you start