Volume Converter
Type a number once — see it in every volume unit instantly.
Enter a number to see it in every unit.
All units at once
| Unit | Value |
|---|---|
| Milliliter (mL) | — |
| Liter (L) | — |
| Cubic meter (m³) | — |
| Cubic inch (in³) | — |
| Cubic foot (ft³) | — |
| Teaspoon US (tsp) | — |
| Tablespoon US (tbsp) | — |
| Fluid ounce US (fl oz) | — |
| Cup US | — |
| Pint US (pt) | — |
| Quart US (qt) | — |
| Gallon US (gal) | — |
| Gallon UK (imperial) | — |
| Fluid ounce UK (imperial) | — |
| Pint UK (imperial) | — |
Cups, pints, quarts, gallons, teaspoons and tablespoons are US customary units (1 US gallon = 3.785 L). Gallon UK is the larger imperial gallon (4.546 L).
US, UK, and metric volume — one base, many names
Volume is where measurement systems collide most often in daily life: a recipe in cups, fuel economy in gallons, an aquarium rated in liters, a shipping box in cubic meters. The trouble is that "gallon," "ounce," "cup," and "pint" all mean different amounts depending on whether they are US customary or UK imperial. This converter fixes every unit to its exact definition in liters and routes conversions through that single base, so a value typed once appears correctly in all eleven units at the same time.
How to use it
- Type the value you have.
- Set From to its current unit and To to the target; the ⇄ button swaps them.
- Read the highlighted result, or scan the full table to see teaspoons through gallons at once. Your last unit pair is remembered locally for next time.
The exact definitions (why "a pint" is ambiguous)
Everything is anchored to the liter. The US gallon is defined as exactly 3.785411784 L, and the US system builds down from it: 1 gallon = 4 quarts = 8 pints = 128 fluid ounces, so a US fluid ounce is 29.5735 mL. The UK imperial gallon is a completely separate 4.54609 L — about 20% larger — and its pint (568 mL) and fluid ounce (28.4131 mL) differ too. This tool exposes the US units by default and offers the imperial gallon as a clearly labeled "Gallon UK," so the two systems never blur together.
Worked examples
Reference: one unit in milliliters
| Unit | Exact value | System |
|---|---|---|
| Teaspoon (tsp) | 4.92892 mL | US customary |
| Tablespoon (tbsp) | 14.7868 mL | US customary |
| Fluid ounce (fl oz) | 29.5735 mL | US customary |
| Cup | 236.588 mL | US customary |
| Pint (pt) | 473.176 mL | US customary |
| Quart (qt) | 946.353 mL | US customary |
| Gallon US | 3,785.41 mL | US customary |
| Gallon UK | 4,546.09 mL | UK imperial |
| Liter (L) | 1,000 mL | Metric (base) |
| Cubic meter (m³) | 1,000,000 mL | Metric |
Common mistakes
- Mixing US and UK gallons. The imperial gallon is ~20% bigger; a fuel or tank figure converted with the wrong one is off by that much.
- Assuming the fluid ounce is universal. A US fl oz is 29.57 mL but a UK fl oz is 28.41 mL — close enough to miss, far enough to spoil a scaled recipe.
- Confusing fluid ounces with weight ounces. A fluid ounce measures volume; an ounce of weight is mass. 1 fl oz of water happens to weigh about 1 oz, but 1 fl oz of honey weighs much more — use a weight converter for the latter.
- Dry vs liquid measure. US "dry pints" and "dry quarts" (for produce) are larger than the liquid ones shown here; this converter handles liquid volume only.
Precision and scope
Results keep up to 10 significant figures and trim trailing zeros; extreme magnitudes switch to scientific notation so nothing rounds silently to zero. Volume alone does not tell you weight — converting flour or sugar between cups and grams depends on density, which a pure volume tool cannot know.
Sources & further reading
Frequently asked questions
How many liters are in a gallon? (US vs UK)
It depends which gallon you mean. 1 US gallon = 3.785411784 liters, while 1 UK (imperial) gallon = 4.54609 liters — about 20% larger. This converter defaults to the US gallon and labels the imperial one separately as "Gallon UK", so you never mix them up. So 5 US gal = 18.927 L, but 5 UK gal = 22.730 L.
How do I convert mL to fl oz and cups for cooking?
Using US customary kitchen units: 1 US fluid ounce = 29.5735 mL and 1 US cup = 236.588 mL (8 fl oz). So 250 mL ≈ 8.45 fl oz ≈ 1.06 cups, and 500 mL ≈ 2.11 cups. Type the milliliters once and the table shows teaspoons, tablespoons, fluid ounces and cups together — handy for scaling a recipe.
Which cup, ounce and gallon does this converter use?
By default it uses US customary units: 1 cup = 236.588 mL, 1 fluid ounce = 29.5735 mL, 1 pint = 473.176 mL, 1 quart = 946.353 mL and 1 gallon = 3.785411784 L. The imperial (UK) gallon is offered as a separate "Gallon UK" option at 4.54609 L. Every option and table row is labeled US or UK to avoid the common gallon and fluid-ounce mix-up.
How precise are the volume results?
Every conversion keeps up to 10 significant figures, then trailing zeros are trimmed for readability. Very large or very small numbers (roughly 1e15 and above, or below 1e-9) switch to scientific notation, so nothing is silently rounded away to zero. All values use the exact liter-based definition of each unit.
Is my input sent to a server?
No. This volume converter runs entirely in your browser — the number you type is never uploaded anywhere. The only thing saved is your last chosen unit pair (for example gallons → liters), kept in your browser's local storage so it is ready next time. The value itself is not stored.