Volume Unit Converter

Formula or method

Output = input × source volume factor ÷ destination volume factor, using liters as the reference. One US liquid gallon is 231 cubic inches = 3.785411784 L; one Imperial gallon is 4.54609 L. One cubic meter is 1,000 L.

How to use this calculator

1. Enter the Value to convert. The interface starts with 1; replace it with your measurement or quantity. Blank, nonnumeric and out-of-range values cannot produce a result.
2. Select From unit for the source unit. Match the complete label, including square/cubic units, decimal/binary prefixes or the gallon system when applicable.
3. Select To unit for the destination unit, then read Converted value with its unit label.
4. Try the worked example with its stated source and destination units. Results show at most eight fractional digits; very small nonzero values use scientific notation. Check the page limitations before interpreting the output.

Worked example

Select US gallon (gal) → liter (L), then enter 2. The result is 2 × 3.785411784 = 7.570823568 L, displayed as 7.57082357 L. Selecting Imperial gallon for the same input gives 9.09218 L.

Understanding the result

The output describes the same amount of space, not its mass. Two US gallons and two Imperial gallons are different volumes even though both are called gallons.

Limitations and assumptions

• Use a nonnegative volume. US quarts, pints and fluid ounces here are liquid measures, not dry measures.
• This does not compute volume from dimensions or convert volume to mass; mass conversion additionally requires density. Display rounding does not imply measurement accuracy.

Frequently asked questions

Sources

• NIST SP 811: quantity-specific conversion factors
• NIST SP 330: non-SI units accepted with the SI