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Volume Conversion
Tool Description
Volume Conversion is an online volume unit conversion tool that supports mutual conversion between metric (mL/L/m³/cm³), imperial/US (fl oz/pt/qt/gal/in³/ft³/yd³), cooking units (cup/tbsp/tsp), UK gallon, and oil barrel. Enter any value and unit to instantly view the corresponding results in all other units. Suitable for cooking and baking, scientific experiments, international trade, petrochemical industry, and more.
How to Use
- Enter a value
Type the value you want to convert in the input field, supporting integers and decimals, e.g.,
100,0.5 - Select source unit
Choose the volume unit of your value from the dropdown (mL/L/m³/cm³/fl oz/pt/qt/gal/in³/ft³/yd³/cup/tbsp/tsp/UK gal/bbl)
- View results
Click the "Convert" button or press Enter, and the result area below will display the corresponding values in all units. Each result has a copy button for convenience.
Use Cases
- Cooking & Baking: Convert cups, tablespoons (tbsp), and teaspoons (tsp) from foreign recipes to milliliters for precise measurements; 1 cup ≈ 236.6 mL
- Scientific Experiments: Quickly convert between milliliters (mL) and liters (L) in the lab for solution preparation and reagent measurement
- International Trade: Distinguish between US gallons (gal) and UK gallons, and convert between oil barrels (bbl) and liters to avoid trade disputes
Key Advantages
- Free and No Install
Completely free to use right in your browser, with no software to download or install and no device storage consumed.
- Private and Secure
All conversions run locally in your browser using pure JavaScript math; your input never leaves your device, keeping your data private.
- Broad Unit Coverage
Covers 15 units across metric, imperial, US, engineering volume, and cooking—one entry yields all results for lab, kitchen, and engineering needs.
- Cooking Specialized
Includes cups, tablespoons, and teaspoons for Western recipes, so you can convert without lookups and bake with precise ratios.
- Reliable Precision
Uses internationally standardized ratios (e.g., 1 US gal = 3.785411784 L) with double-precision calculation for accurate, trustworthy results.
- Easy Copy
Each result has a copy button on the right, letting you copy values with one click for use in documents, spreadsheets, or chat tools.
Metric Volume Unit Conversion
The following table shows the conversion relationships between metric volume units, using cubic meter (m³) as the base unit:
| Unit Name | Abbr. | Conversion Relationship | Equivalent m³ |
|---|---|---|---|
| Milliliter | mL | 1 mL = 1 cm³ | 0.000001 |
| Liter | L | 1 L = 1,000 mL | 0.001 |
| Cubic Meter | m³ | 1 m³ = 1,000 L | 1 |
| Cubic Centimeter | cm³ | 1 cm³ = 1 mL | 0.000001 |
Imperial/US & Cooking Unit Conversion
The following table shows the conversion relationships for imperial/US volume units, cooking units, and special units, using cubic meter (m³) as the base unit:
| Unit Name | Abbr. | Conversion Relationship | Equivalent m³ |
|---|---|---|---|
| Fluid Ounce | fl oz | 1 fl oz = 29.5735 mL | 0.0000295735 |
| Pint | pt | 1 pt = 16 fl oz | 0.000473176 |
| Quart | qt | 1 qt = 2 pt | 0.000946353 |
| Gallon | gal | 1 gal = 4 qt | 0.00378541 |
| UK Gallon | UK gal | 1 UK gal = 4.54609 L | 0.00454609 |
| Barrel | bbl | 1 bbl ≈ 158.987 L | 0.158987 |
| Cubic Inch | in³ | 1 in³ ≈ 16.387 mL | 0.000016387064 |
| Cubic Foot | ft³ | 1 ft³ = 1,728 in³ | 0.0283168 |
| Cubic Yard | yd³ | 1 yd³ = 27 ft³ | 0.764555 |
| Cup | cup | 1 cup = 8 fl oz | 0.000236588 |
| Tablespoon | tbsp | 1 tbsp = 3 tsp | 0.0000147868 |
| Teaspoon | tsp | 1 tsp ≈ 4.92892 mL | 0.00000492892 |
US Gallon vs UK Gallon
US Gallon is the volume unit commonly used in the United States. 1 US gallon = 3.785411784 L. In the US, gasoline, milk, beverages, and other liquid goods are typically measured in US gallons.
UK Gallon (Imperial Gallon) is the traditional volume unit used in the UK and Commonwealth countries. 1 UK gallon = 4.54609 L. The UK gallon is approximately 20% larger than the US gallon. Historically, Britain used several gallon standards (such as wine gallon and ale gallon) before standardizing to the imperial gallon in 1824. Special care is needed in international trade and when reading foreign literature to distinguish between the two.
FAQ
1 L = 1,000 mL, 1 m³ = 1,000 L = 1,000,000 mL. Metric volume units use a factor of 1,000: 1 m³ = 1,000 L = 1,000,000 mL = 1,000,000 cm³. In daily life, a typical water bottle is 500 mL (0.5 L), a water cooler jug is 18.9 L, and a standard bathtub holds about 200-300 L.
1 US gallon (US gal) = 3.785411784 L, 1 UK gallon (UK gal) = 4.54609 L. The UK gallon is about 20.1% larger than the US gallon. US gallons are used in the United States, Canada, and other American countries, while UK gallons are used in the UK and some Commonwealth countries. For example, US car fuel economy is expressed in MPG (miles per US gallon), while UK MPG uses miles per imperial gallon—the two cannot be directly compared.
1 standard oil barrel (bbl) = 42 US gallons ≈ 158.987 L. The tradition of measuring oil in barrels dates back to the early oil drilling days in 19th-century Pennsylvania, when whiskey barrels (42 gallons) were used as transport containers. Although oil is now transported via pipelines and tankers, the "barrel" has persisted as the standard unit. Common reference: Brent crude and WTI crude are both quoted in USD per barrel, and 1 metric ton of crude oil equals approximately 7.33 barrels (depending on crude density).
1 US cup = 8 fluid ounces (fl oz) ≈ 236.588 mL, 1 tablespoon (tbsp) = 3 teaspoons (tsp) ≈ 14.787 mL, 1 teaspoon (tsp) ≈ 4.929 mL. Common cooking approximations: 1 cup ≈ 240 mL, 1 tbsp ≈ 15 mL, 1 tsp ≈ 5 mL. Note that cup and spoon standards vary slightly between countries; this tool uses the US standard.
No. All conversion calculations run entirely in your browser using pure JavaScript math. Your input data never leaves your device.
This tool uses JavaScript double-precision floating-point numbers (64-bit IEEE 754) for calculations, which is sufficiently accurate for the vast majority of everyday scenarios. Imperial/US units use internationally standardized conversion ratios (e.g., 1 US gal = 3.785411784 L exact). Decimal portions are capped at 6 significant decimal places, and excessively long decimals are automatically truncated. For extremely large or small values, there may be minor errors due to floating-point precision limitations, but this has virtually no practical impact.
It supports 15 volume units: metric (mL, L, m³, cm³), imperial/US (fl oz, pt, qt, gal, UK gal, bbl), engineering volume (in³, ft³, yd³), and cooking units (cup, tbsp, tsp). Enter a value in one unit and the others are calculated automatically.
No. The tool is completely free and requires no registration or login. Just open the page and start using it—no ads, no personal information requested, ideal for quick lookups and professional references.
Yes. The page is responsive and works on phones, tablets, and desktop browsers alike. On mobile, simply tap the input, choose a unit, and tap convert to see results, just like on desktop.
Batch input is not yet supported. The current version converts one value at a time, but a single entry yields results for all 15 units at once, which covers most lab, cooking, and engineering scenarios.
They have different historical definitions. The US gallon is based on 231 cubic inches (about 3.785 L), while the UK gallon is 4.54609 L—about 20% larger. Car fuel tanks and MPG figures require confirming which gallon type is used to avoid calculation errors.
Click the copy icon on the right of the result box. Each unit result has a copy button that copies the value to your clipboard with one click, ready to paste into a document, spreadsheet, or chat window without manually selecting text.
Content last updated：2026-07-16
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