Enter a volume, choose its source and destination units, and get the matching amount without confusing US and Imperial measures.
Advanced options
Table of contents
How to use our Volume Conversion Calculator
- Enter the number from your recipe, label, worksheet, or specification in "Volume amount."
- Under "Convert from," choose the exact unit printed with that number, including its US or Imperial label when shown.
- Under "Convert to," choose the unit requested for your answer and select "Calculate."
- Read "Converted volume" first, then confirm that its unit is the one you selected under "Convert to."
- Use "Destination units per source unit" to check the conversion path, or open "Advanced options" if you need a different number of displayed decimal places.
Definitions
Volume: The amount of three-dimensional space something occupies, measured in units such as liters, cups, or cubic feet.
Liter (L): A metric unit of volume. One milliliter (mL) is 0.001 L, and one cubic centimeter (cm^3 or cc) equals one mL.
US liquid unit: A US volume measure such as a US cup, fluid ounce, pint, quart, or gallon.
Imperial unit: A volume measure in the Imperial system, such as an Imperial fluid ounce, pint, or gallon. It is not interchangeable with a US unit of the same name.
Fluid ounce (fl oz): A unit of volume. It differs from oz without "fluid," which commonly describes an ounce of mass.
Conversion factor: The number of destination units in one source unit. Multiply the entered amount by this factor to get the converted volume.
Common mistakes and quick fixes
Mistake: Choosing an Imperial gallon, pint, or fluid ounce for a US measure.
Fix: Match the full name on the label or problem. US and Imperial units with the same name are different sizes.
Mistake: Typing "oz" after the number.
Fix: Enter only the number, then choose a fluid-ounce unit if the source is volume. "Oz" by itself usually means weight.
Mistake: Using a comma as a decimal, such as 1,5.
Fix: Use a decimal point for decimals, such as 1.5. Use commas only for thousands, such as 1,500.
Mistake: Entering a range or calculation such as 2-3 or 1+1.
Fix: Enter one nonnegative number. Work out arithmetic first and convert each end of a range separately if needed.
Mistake: Treating the displayed rounded number as the full conversion value.
Fix: Increase "Result decimal places" when a small result needs more visible detail.
Limitations & Key Assumptions / Boundary Conditions
- This tool converts volume only. Converting weight or mass would require the density of the material.
- US and Imperial fluid ounces, pints, and gallons are different units, so the selected system must match the source.
- The selected decimal-place setting rounds the visible result only; the conversion calculation uses the unrounded value.
- Physical volume must be zero or greater. Negative values, ranges, formulas, unit text, and malformed comma grouping are rejected.
- A container's labeled capacity may differ from the amount currently inside it. Enter the actual volume you want to convert.
Methodology
Conversion method
Each supported unit has a fixed size in liters. The calculator changes the source amount into liters, then divides by the size of the destination unit. Metric volume relationships and US customary conversion factors follow NIST references.
conversion factor = liters per source unit / liters per destination unit
converted volume = entered volume amount * conversion factor
Worked example
Convert 2 US liquid gallons to liters. One US liquid gallon equals 3.785411784 L, so the conversion factor is 3.785411784 liters per US gallon.
converted volume = 2 * 3.785411784 = 7.570823568 L
With six decimal places selected, the displayed answer is 7.570824 L. The longer value is kept for the calculation before display rounding.