OnSumoTools

Volume Converter - ml, L, fl oz, Cups, Gallons and More

Enter a volume, pick your unit, and see all other units instantly with the formula shown.

Volume conversions trip people up because metric and US customary units use different base sizes, and US and UK gallons are not the same unit. This converter covers nine everyday units from milliliters to cubic meters, plus fluid ounces, cups, pints, quarts, and both US and UK gallons. Enter any value, pick your starting unit, and every other unit updates instantly with the conversion formula shown.

How to use the volume converter

  1. Enter the volume value you want to convert.
  2. Select the unit you are converting from (ml, L, m³, fl oz, cup, pt, qt, gal US, or gal UK).
  3. The tool shows all other units at once with the formula for each.
  4. Click Copy next to any result to copy it to your clipboard.

Worked examples

  • L to gal US: fuel economy

    Enter 50 and select liter. Formula: 50 times 0.26417 equals 13.209 gal US. A 50-liter fuel tank holds about 13.2 US gallons.

  • fl oz to ml: recipe

    Enter 8 and select fluid ounce (US). Formula: 8 times 29.574 equals 236.59 ml. One US cup of liquid is 8 fl oz, or 236.6 ml.

  • gal UK to L: water usage

    Enter 100 and select gallon (UK). Formula: 100 times 4.5461 equals 454.61 L. A UK water bill might quote usage in gallons; 100 UK gallons is about 454.6 liters.

  • ml to cups: baking

    Enter 500 and select milliliter. Formula: 500 times 0.0042268 equals 2.1134 cups. A 500 ml carton of cream is about 2.1 US cups.

Conversion factor reference

FromToMultiply by
Lfl oz US33.814
fl oz USml29.574
Lgal US0.26417
gal USL3.7854
Lgal UK0.21997
gal UKL4.5461
gal USgal UK0.83267
gal UKgal US1.2009
cupml236.59
pt USml473.18
qt USL0.94635
m³L1000

Common volume reference

Unitmlfl oz (US)cups / L
Teaspoon (US)4.929 ml0.1667 fl oz1/48 cup
Tablespoon (US)14.79 ml0.5 fl oz1/16 cup
1 US cup236.6 ml8 fl oz0.2366 L
Standard can (12 fl oz)355 ml12 fl oz0.355 L
1 US pint473.2 ml16 fl oz0.4732 L
1 US quart946.4 ml32 fl oz0.9464 L
1 US gallon3785 ml128 fl oz3.785 L
1 UK gallon4546 ml160 fl oz (UK)4.546 L

Frequently asked questions

  • How do you convert liters to gallons?

    Multiply the volume in liters by 0.26417 to get US gallons, or by 0.21997 to get UK gallons. For example, 10 L times 0.26417 equals 2.6417 US gallons.

  • How many milliliters are in a cup?

    One US cup equals 236.59 ml. This is based on 1 US fluid ounce being exactly 29.5735295625 ml and one cup containing 8 fluid ounces.

  • What is the difference between a US gallon and a UK gallon?

    A US gallon equals 3785.4 ml (about 3.785 L). A UK imperial gallon equals 4546.1 ml (about 4.546 L). The UK gallon is about 20% larger than the US gallon.

  • How many fluid ounces are in a liter?

    One liter equals 33.814 US fluid ounces. Conversely, 1 US fluid ounce equals exactly 29.5735295625 ml. So for a 500 ml bottle, that is about 16.9 fl oz.

  • How do you convert cubic meters to liters?

    Multiply cubic meters by 1000 to get liters. One cubic meter equals exactly 1000 liters because 1 liter is defined as 1 cubic decimeter (0.001 m³).

  • How many cups are in a quart?

    There are exactly 4 US cups in one US quart. A quart equals 32 US fluid ounces, and a cup equals 8 US fluid ounces. So 1 qt equals 946.35 ml.

  • How accurate are these volume conversions?

    Results are shown to at least 5 significant figures using exact conversion factors. The US fluid ounce is defined as exactly 29.5735295625 ml; the UK gallon is defined as exactly 4546.09 ml.

Related tools

Liters, gallons, cups and more

Volume units are a mess. Cooking uses cups and spoons. Fuel uses liters or gallons. Industry uses cubic meters. And a gallon in the US isn't the same as a gallon in the UK.

The converter handles the common ones in one place. Enter an amount, choose the units and read the result, with the formula shown next to it.

Know your gallon

A US gallon is 3.785 liters. A UK, or imperial, gallon is 4.546 liters, about 20 percent bigger. That's why a car's mpg figure looks better on a UK sticker than on a US one for the same car. The numbers aren't comparable until you convert.

Fluid ounces differ too, but only slightly. A US fluid ounce is 29.57 ml, and a UK one is 28.41 ml.

Kitchen numbers

One US cup is about 237 milliliters, though many labels round it to 240. A quart is 4 cups, a pint is 2 cups and a gallon is 16 cups. There are 8 fluid ounces in a cup, so a liter holds a bit over 33.8 fluid ounces.

One cubic meter is 1,000 liters. A cubic centimeter equals one milliliter, which is handy when a recipe or medicine label switches terms.

  • 1 liter = 4.227 US cups
  • 1 US gallon = 3.785 liters
  • 1 cup = 236.6 milliliters
  • 1 cubic meter = 1,000 liters

Accuracy

The factors are standard, so the math is exact to the digits shown. For baking, weigh dry ingredients when you can. A cup of flour can vary a lot depending on how it's packed, and volume only tells part of the story.

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