Volume Unit Converter
| Unit | Symbol | = base units |
|---|---|---|
| liter | L | 1 L |
| milliliter | mL | 0.001 L |
| cubic meter | m³ | 1,000 L |
| cubic centimeter | cm³ | 0.001 L |
| US gallon | gal | 3.785411784 L |
| US quart | qt | 0.946352946 L |
| US pint | pt | 0.473176473 L |
| US fluid ounce | fl oz | 0.02957353 L |
| US cup | cup | 0.236588236 L |
| cubic foot | ft³ | 28.316846592 L |
| oil barrel | bbl | 158.987294928 L |
| UK gallon | gal(UK) | 4.54609 L |
| UK pint | pt(UK) | 0.56826125 L |
| UK fluid ounce | fl oz(UK) | 0.028413062 L |
How to Use
Overview
Volume is where unit confusion costs the most: the US gallon and the UK gallon differ by about twenty percent, 3.785411784 L against 4.54609 L. This tool lists both chains separately, all fourteen units built on the litre, so an imported drum, a fuel tank and an English recipe are never mixed up. It also carries the oil barrel at 158.987 L for crude and chemical quotations, and the cubic foot for gas volumes. A quart is a quarter gallon and a pint half of that in both systems, so the families diverge only at the gallon definition itself. The two gallon chains exist because the imperial gallon was defined in 1824 against distilled water at a stated temperature, while the US gallon kept an older wine measure; that history is why a UK pint of milk and a US pint of beer are different volumes. The oil barrel is not a gallon multiple by accident either: forty-two US gallons was the standard wooden barrel of the Pennsylvania trade and stayed as the quoting unit after steel drums replaced wood. Knowing which chain a document uses matters more than the arithmetic itself. A fluid ounce is a volume, not a weight, so a label quoting ounces cannot be checked on a kitchen scale.
Features
- Fourteen units in one view: litre, millilitre, cubic metre, cubic centimetre, cubic foot, oil barrel
- US gallon, quart, pint, fluid ounce and cup are kept apart from the UK gallon, pint and fluid ounce
- Expression input such as 2*3.785 or 1/4, evaluated in litres and then shown in every unit
- Leave the target empty to see all units, or pin a single target for a focused answer
- Zero to eight decimals, sorted by value or by the reference order
- Batch lines may carry a unit such as "5 gal_uk" or "2 bbl", exported to TXT or CSV
How to use
- Enter a volume figure or expression, for example 3.5 or 2*0.5
- Choose the source unit, litres by default, or pick the US or UK gallon for imported liquids
- Leave the target empty for the full table, or select one unit such as millilitre or cubic foot
- Press Swap to convert the current result back, which is handy as a second check
- Paste several lines with a unit on each, then download TXT or export CSV
Notes
- Fourteen volume units run from litre and millilitre through cubic metre, US and UK gallons, quarts, pints, fluid ounces and cups to the oil barrel, with the litre as the base and both gallon families kept apart.
- The two gallons differ by about twenty percent at 3.785411784 L and 4.54609 L, so picking the wrong one shifts fuel, paint or bulk liquid results by nearly a fifth.
- A barrel is a trade convention rather than a geometric volume at 42 US gallons or 158.987294928 L; crude is quoted in barrels while retail fuel sells by litre or gallon.
- Cubic feet suit gas volumes at 28.316846592 L, yet the same volume holds different moles under other pressure and temperature, which this tool does not correct.
- The US cup is 236.5882365 mL following nutrition labelling; CSV holds numbers only, so normalise units before a batch summary.
- One US gallon is four quarts, eight pints and 128 fluid ounces; one UK gallon is four quarts, eight pints and 160 fluid ounces
- In a batch line like "5 gal_uk" the code must match the dropdown, for example gal_uk, pt_uk or floz_uk
- Decimals affect display only; the maths is double precision, so millilitre to cubic metre round trips keep their precision