Volume Converter
Convert between liters, gallons, cups, milliliters, fluid ounces, pints, and cubic units instantly.
- Free, no account
- No watermark
- No usage limit
About the Volume Converter
Most volume converters hand you two dropdowns, a "from" and a "to," and make you convert one pair at a time. That's fine until you notice the unit names themselves are unreliable. A "gallon" is two different sizes. A "cup" is at least four. So you pick "gallons" somewhere, the tool quietly assumes the US one, and if you meant the British gallon your answer is off by about a fifth with nothing to warn you.
This one cuts out the guessing. Type a single number, pick the unit you have, and it shows that amount in all sixteen volume units at once, updating live as you type. Liters and milliliters, US and Imperial gallons, cups, pints, quarts, fluid ounces, tablespoons and teaspoons, plus cubic meters, centimeters, inches and feet. Because every unit sits in one table together, you can see the US-versus-Imperial gap for yourself instead of trusting one number you have no way to check.
Need your value in three units? It's already there, with no re-converting and no second lookup. It all runs in your browser too, nothing you type is uploaded, and once the page has loaded it keeps working with no connection.
How to use
- Type your amount in the Value box. Any number works, whole, decimal, very small, or very large.
- Pick the unit you have in the From dropdown. Gallons, pints and fluid ounces are each labeled US or Imperial (UK) on their own line, so you always know which one you selected.
- Read the answer straight off the table below. Every unit updates as you type, and the row for your chosen unit is highlighted so you don't lose your place among sixteen of them.
- Hit copy on any row to grab that one number. Or use Copy shareable link, which rebuilds the page address with your value and unit baked in, so whoever opens it lands on the exact same conversion.
Leave the box empty or type something that isn't a number and you'll get a dash, not a crash or a NaN.
The gallon and the cup both lie
US and UK units share names but not sizes, and that mismatch wrecks more recipes and fuel figures than any actual arithmetic slip.
- US gallon: about 3.785 liters (128 US fluid ounces)
- Imperial gallon: about 4.546 liters (160 Imperial fluid ounces)
The Imperial gallon is roughly 20% bigger, so a "5 gallon" bucket in Britain holds noticeably more than a "5 gallon" bucket in the States. The same gap runs right through the family. A US pint is 473 mL, an Imperial pint is 568 mL. The fluid ounce flips the pattern. The US one (29.57 mL) is a hair bigger than the Imperial (28.41 mL), even though the US pint is smaller. A US pint is 16 fluid ounces, an Imperial pint is 20, so the ounce counts don't line up and you cannot reason your way to the right number by feel. That is exactly why the tool labels each one and shows both side by side.
Cups are messier still, there's no single cup. This converter uses the US customary cup, 236.6 mL, but a US nutrition-label cup is 240 mL, a metric cup (Australia, much of Europe) is 250 mL, and a Japanese rice cup is only 180 mL. The Japanese one is the real trap. A Japanese rice recipe written in "cups" means that 180 mL measure, so scoop it with a 237 mL American cup and you've overshot the rice by nearly a third, and the whole pot comes out wrong. When a recipe comes from somewhere else, convert it to milliliters first and the ambiguity just goes away.
If you ever need the gallon math by hand, multiplying US gallons by about 0.833 gets you Imperial, and 1.201 brings you back the other way.
Getting the most out of the all-units view
Showing every unit at once matches how volume work actually goes. You rarely need just one target. Dosing an aquarium is the classic case, the additive bottle is marked in milliliters, the tank is rated in liters, and the dosing instructions are per US gallon. Type the tank size once and all three sit right there. Same story for a car (fuel bought in liters, economy quoted in US or UK mpg) or a lab bench where one instrument reads metric and the next reads US customary.
A couple of things worth knowing to use it well:
- The copy button saves you hunting for the right row. One click grabs that unit's figure, which beats dragging to select the digits by hand when sixteen numbers sit stacked together.
- The shareable link is for handoffs. Sending a spec to a supplier or a teammate? Copy the link instead of typing "2.5 gallons" into a message and hoping they read it as the same gallon you meant. They open the page and the value and unit are already set.
On precision, the table keeps eight significant figures, because most conversions across the metric-to-US line don't land on round numbers and hiding digits would just make the tool a little wrong. When a result gets very big or very small the row switches to scientific notation so it stays readable. Round to whatever your task actually needs, the tool leaves that call to you on purpose.
Frequently asked questions
Why is a cubic foot 28.3 liters and not 30.5?
Because volume grows with the cube of length, not the length itself. A foot is 30.48 cm, but a cubic foot is 30.48 cm cubed, which comes to 28,317 cm³, or 28.317 liters. Forgetting to cube the factor is the classic error behind a tank or container that "should" hold far more than it does. The converter already applies the cubed factors for cubic meters, centimeters, inches and feet, so you never raise anything to the third power yourself.
Is a US teaspoon really 5 mL?
Not quite. A US teaspoon is 4.929 mL and a US tablespoon is 14.79 mL, both a touch under the round 5 and 15 mL most kitchens assume. The clean 5 mL figure is the separate metric teaspoon used in medicine and across much of the Commonwealth. For cooking the difference is nothing. For measuring liquid medicine it can matter, which is why pharmacies push a marked syringe over a spoon from the drawer.
Can I convert flour or sugar from cups to grams here?
No, and that's down to physics rather than a gap in the tool. Cups measure volume (space), grams measure mass (weight), and the bridge between them is the ingredient's density. A cup of flour and a cup of sugar weigh different amounts, so there's no single factor to apply. This tool converts volume to volume perfectly, cups to mL, mL to fluid ounces, and so on. For baking, a kitchen scale beats any cup measurement for consistency anyway.
Does the shareable link store my numbers anywhere?
No. The link just tucks your value and unit into the page address itself. There's no account, no database, and nothing saved on a server. Whoever opens it runs the same local conversion in their own browser. And if you never click the link button, nothing about your input leaves your device at all.
Are the conversion factors exact, or rounded off?
The defined ones are exact. A US gallon is precisely 3.785411784 liters, an Imperial gallon 4.54609, an inch exactly 2.54 cm, so those conversions carry no rounding at all in the actual math. Only the display is trimmed, down to eight figures. That's also why a couple of numbers here can look slightly off from a rounder figure you saw on another site, the other tool rounded the factor itself and this one doesn't.
Does this cover a US dry pint, like the kind used for berries?
Not this tool. The pints and quarts here are liquid (fluid) measures. The US also keeps a separate dry pint of about 550 mL, used for produce like berries and cherries, which is bigger than the liquid pint of the same name. If you're measuring liquid or the space something fills, the units here are what you want. Dry produce measures are a different standard the tool doesn't include.