Volume Converter: Units, Formulas, and Examples
Convert liters, milliliters, cubic units, and clearly labeled US and Imperial liquid units.
How to convert volume
Converted value = input value × source factor ÷ target factor. Factors express each unit in liters.
Keep the source and target definitions consistent, apply the conversion to the original value, and round the final answer to the precision needed for your calculation.
Understanding volume units
Volume measures three-dimensional space. One liter equals 1,000 milliliters; one cubic meter equals 1,000 liters. US liquid gallons and Imperial gallons have different volumes. US dry measures are not included.
| Unit | In L |
|---|---|
| Liters (L) | 1 |
| Milliliters (mL) | 0.001 |
| Cubic meters (m³) | 1,000 |
| Cubic centimeters (cm³) | 0.001 |
| Cubic inches (in³) | 0.016387064 |
| Cubic feet (ft³) | 28.316846592 |
| US liquid gallons (US gal) | 3.785411784 |
| Imperial gallons (Imp gal) | 4.54609 |
| US liquid quarts (US qt) | 0.946352946 |
| US liquid pints (US pt) | 0.473176473 |
| US fluid ounces (US fl oz) | 0.0295735295625 |
| Imperial fluid ounces (Imp fl oz) | 0.0284130625 |
Worked volume examples
1 US liquid gallon = 3.785411784 liters. 1 Imperial gallon = 4.54609 liters. 1 cubic foot = 28.316846592 liters.
Frequently asked questions
Which definitions should I use?
Fluid ounces measure volume; ordinary ounces measure mass. Converting between volume and mass requires the substance’s density.
Why do displayed results sometimes differ slightly?
Intermediate arithmetic uses browser floating-point numbers. Display rounding and the precision of an original measurement can affect the last digits. The unit conversion does not improve the accuracy of a measured value.
Does converting back recover the original value?
Using the unrounded result normally recovers the original quantity within floating-point precision. Copying a rounded number can introduce a small difference.
How are the unit definitions documented?
For physical unit definitions and conversion factors, see the NIST conversion reference.