Volume Converter Free Online
Convert between metric and imperial volume units instantly. Supports liters, milliliters, cubic meters, cubic centimeters, cubic inches, cubic feet, US/UK gallons, quarts, pints, fluid ounces, and cups.
All Conversions
Pro — bulk batch conversion, API access, history & favorites
API access · Priority queue · Team workspace
Related Tools
How It Works
Enter a Value
Type the number you want to convert into the From input. The conversion runs as you type — no Convert button needed. Decimals and very small or very large numbers are supported via scientific notation.
Pick Source & Target Units
Use the two dropdowns to choose source (From) and destination (To) units. The result updates automatically. Use the swap button to flip the conversion direction in one click.
See All Conversions
Below the main result, the All Conversions panel shows your input value converted into every supported unit at once — perfect for comparing metric vs imperial side by side.
Volume Converter Features
Metric Capacity
Milliliter, liter, cubic meter, cubic centimeter. 1 mL = 1 cm³ exactly. Liter is the everyday SI unit (1 L = 0.001 m³).
US Customary
US gallon, quart, pint, cup, fluid ounce. 1 US gallon = 3.785 L. Useful for American recipes, fuel volumes, and beverage sizes.
UK Imperial
UK gallon (4.546 L) is about 20% larger than US gallon. Critical when converting British recipes or fuel-economy figures (mpg UK vs US).
Cubic Units
Convert between flat (liter, gallon) and cubic (m³, ft³, in³) units. 1 m³ = 1000 L. Useful for shipping, construction, and HVAC sizing.
Live Conversion
Result updates on every keystroke. Toggle between US/UK or metric/imperial without retyping the value.
100% Private
All math runs in your browser. Safe for confidential lab measurements, recipe IP, or industrial volumes.
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| All 12 volume units | ||
| Live conversion | ||
| All-units result table | ||
| Bulk CSV / Excel conversion | — | |
| REST API access | — | |
| Custom precision settings | — |
Frequently Asked Questions
The US gallon (3.785 L) and UK imperial gallon (4.546 L) come from two different historical definitions. The US adopted the older Queen Anne wine gallon in 1707; Britain switched to the imperial gallon in 1824. The difference matters for fuel economy (mpg), recipes, and large beverage volumes.
1 US fluid ounce = 29.5735 mL exactly. 1 UK fluid ounce = 28.4131 mL. The two are different — recipes from the US and UK are not interchangeable for very precise baking.
Yes, exactly. 1 L = 1 dm³ = 1000 cm³ = 1000 mL. The liter is defined as exactly 0.001 m³ since 1964.
1 cubic meter = 264.172 US gallons = 219.969 UK gallons. Use the All Conversions panel to see both side-by-side.
Yes — but for precise baking, use the dedicated Cooking Converter which adds tablespoon, teaspoon, and ingredient-density presets (a cup of flour ≠ a cup of water by weight).