Volume Converter
Convert between liters, gallons, cups and more.
How to use Volume Converter
Enter your volume amount
Click the input field labeled 'Enter Volume' and type your numerical value. Use decimal points for partial amounts (e.g., 2.5 for 2.5 liters).
Select your source unit
Click the 'From' dropdown menu below the input field and choose your starting unit (liters, gallons, cups, milliliters, fluid ounces, pints, quarts, or tablespoons).
Choose your target unit
Click the 'To' dropdown menu and select the unit you want to convert to. The conversion calculates automatically.
View and copy your result
Read the converted value in the blue result box labeled 'Result'. Click the copy icon next to the result to copy it to your clipboard.
Related Tools
Volume converter: liters, gallons, pints, quarts, and more
Volume converter: liters, gallons, pints, quarts, and more
Convert between liters, milliliters, US gallons, UK gallons, quarts, pints, cups, and fluid ounces at ToolHQ's volume converter, with clear US vs. UK distinction. Free, no account required.
Volume units are where US and UK measurements diverge most confusingly. A US gallon is 3.785 liters. A UK imperial gallon is 4.546 liters. A US pint is 473ml. A UK pint is 568ml. Even "fluid ounce" differs between the two systems. Following a UK recipe in the US, or comparing fuel volumes internationally, requires knowing which system is in use.
ToolHQ's volume converter handles US customary, Imperial UK, and metric volume units simultaneously, with all equivalents returned from a single input.
Key Takeaways
- US gallon = 3.785 liters; UK gallon = 4.546 liters (UK is 20% larger)
- US pint = 473 ml; UK pint = 568 ml
- 1 US cup = 240 ml; 1 metric cup (AU/CA) = 250 ml
- 1 liter = 33.81 US fl oz = 35.2 UK fl oz = 4.227 US cups
- No data is stored or transmitted, all calculations run locally in your browser
US vs. UK volume units: the key differences
The most common source of confusion in volume conversion is that US customary units and UK imperial units use the same names for different amounts:
| Unit | US customary | UK imperial |
|---|---|---|
| Gallon | 3.785 liters | 4.546 liters |
| Quart | 0.946 liters | 1.136 liters |
| Pint | 473 ml | 568 ml |
| Cup | 240 ml | 284 ml |
| Fluid ounce | 29.57 ml | 28.41 ml |
| Tablespoon | 14.79 ml | 17.76 ml |
| Teaspoon | 4.93 ml | 5.92 ml |
Key rules:
- UK gallon, quart, pint, cup, and tablespoon are all larger than their US equivalents
- The exception: US fluid ounce (29.57 ml) is slightly larger than UK fluid ounce (28.41 ml)
- Australian and Canadian recipes use a "metric cup" of 250 ml, 4% larger than the US cup
Why the difference? The UK and US systems diverged after American independence. The US adopted different standard volumes from those that the British standardized in the 1824 Weights and Measures Act. The result: two different "gallon" standards, one in the US (wine gallon) and one in the UK (defined in 1824).
All calculations run locally in your browser, no data is stored or transmitted.
Volume conversion reference table
| From | To liters | To US gallons | To UK gallons | To US fl oz |
|---|---|---|---|---|
| 1 liter | 1 L | 0.2642 US gal | 0.2200 UK gal | 33.81 fl oz |
| 1 US gallon | 3.785 L | 1 US gal | 0.8327 UK gal | 128 fl oz |
| 1 UK gallon | 4.546 L | 1.201 US gal | 1 UK gal | 153.7 fl oz |
| 1 US quart | 0.946 L | 0.25 US gal | , | 32 fl oz |
| 1 US pint | 0.473 L | , | , | 16 fl oz |
| 1 US cup | 0.240 L | , | , | 8 fl oz |
| 1 US fl oz | 0.02957 L | , | , | 1 fl oz |
| 1 milliliter | 0.001 L | 0.000264 US gal | , | 0.0338 fl oz |
Mini-story 1: Amelia was following a traditional British recipe that called for "1 pint of milk." She was cooking in the US and assumed a pint was a pint. She bought a US pint (473 ml) of milk. The recipe would have needed a UK pint (568 ml). She entered 1 UK pint into ToolHQ's volume converter and got 568 ml, then found that 568 ml is about 2.4 US cups, so she added 2 cups plus about 6 tablespoons of milk to match the recipe's intent. The dish turned out correctly this time.
Convert volume units free at ToolHQ
How to use the ToolHQ volume converter
- Go to the tool. Navigate to ToolHQ's volume converter. No account or sign-up required.
- Enter your value. Type any number in the input field.
- Select your source unit. Choose from liters, milliliters, US gallons, UK gallons, quarts, pints, cups, fluid ounces, tablespoons, or teaspoons.
- Read all results. The converter returns the equivalent in all supported units simultaneously.
Cooking volume reference table
For recipes, the most useful conversions are between US customary cooking units and metric:
| Unit | Milliliters | Liters | US fl oz |
|---|---|---|---|
| 1 US teaspoon | 4.93 ml | 0.00493 L | 1/6 fl oz |
| 1 US tablespoon | 14.79 ml | 0.01479 L | 0.5 fl oz |
| 1/4 US cup | 59 ml | 0.059 L | 2 fl oz |
| 1/3 US cup | 79 ml | 0.079 L | 2.67 fl oz |
| 1/2 US cup | 120 ml | 0.12 L | 4 fl oz |
| 1 US cup | 240 ml | 0.24 L | 8 fl oz |
| 1 metric cup (AU/CA) | 250 ml | 0.25 L | 8.45 fl oz |
| 1 US pint | 473 ml | 0.473 L | 16 fl oz |
| 1 US quart | 946 ml | 0.946 L | 32 fl oz |
| 1 US gallon | 3,785 ml | 3.785 L | 128 fl oz |
Quick mental conversions:
- 1 cup = roughly 240 ml (or 250 ml for a metric cup)
- 1 tablespoon = about 15 ml
- 1 teaspoon = about 5 ml
- 1 fluid ounce = roughly 30 ml
For cooking-specific unit conversions (including weight measurements for baking), ToolHQ's cooking converter covers cups, grams, ounces, and more alongside volume units.
Mini-story 2: Marcus was buying a pressure washer online. One model listed a water flow rate of 2.5 GPM (gallons per minute). Another listed 9.5 LPM (liters per minute). He needed to compare them. He entered 2.5 US gallons into ToolHQ's volume converter and got 9.46 liters. The two pressure washers had virtually identical flow rates, the first at 2.5 GPM and the second at 9.5 LPM were essentially the same machine rated in different units.
Frequently asked questions
Is a US gallon the same as a UK gallon?
No. A US gallon is 3.785 liters. A UK (imperial) gallon is 4.546 liters, about 20% larger. This difference also cascades into quarts, pints, cups, and tablespoons, which are all defined as fractions of the gallon.
How many ml in a cup?
A US cup is 240 ml (or exactly 236.6 ml). An Australian or Canadian metric cup is 250 ml. A UK cup is 284 ml. For US recipes, use 240 ml. For metric-country recipes, use 250 ml unless the recipe specifies otherwise.
What is the difference between fluid ounce and ounce?
A fluid ounce measures volume. A regular ounce measures weight (mass). They are not interchangeable. 1 US fluid ounce = 29.57 ml. 1 ounce (weight) = 28.35 grams. For water specifically, 1 fluid ounce of water weighs approximately 1 ounce, but this coincidence does not apply to other liquids.
How do I convert liters to US gallons?
Multiply liters by 0.2642. Example: 40 liters x 0.2642 = 10.57 US gallons. Or divide liters by 3.785 to get the same result.
Is the volume converter free?
Yes. ToolHQ's volume converter is completely free, with no account, no sign-up, and no usage limits.
The short version
Volume conversion requires knowing whether you are in the US customary or UK imperial system, they share unit names but not unit sizes. The US gallon (3.785 L) is 20% smaller than the UK gallon (4.546 L), and pints, quarts, cups, and tablespoons follow the same ratio. The only exception: US fluid ounces are slightly larger than UK fluid ounces. For cooking, 1 US cup = 240 ml, 1 tablespoon = 15 ml, and 1 teaspoon = 5 ml. ToolHQ's volume converter handles all three systems simultaneously, returning every equivalent from a single input.
For related tools, ToolHQ's cooking converter handles cups, grams, and ounces for baking, and ToolHQ's unit converter covers weight, length, and temperature alongside volume. Explore more converter tools at ToolHQ.
Convert volume units free at ToolHQ