Volume converter

Enter a volume and convert it between metric, US liquid, and imperial units without confusing similar unit names.

Volume to convert
Converted volume

Contents

Show one volume in another unit

The same capacity shown as liquid in a vessel and as a grid of cubic units

Enter a volume in either field, then choose two units. The paired value updates at once, with separate choices for metric, US liquid, and imperial measures.

The litre is the common bridge

Every listed unit has a factor that states how many litres it contains. The converter multiplies by the source factor and divides by the target factor.

V2=V1ร—k1k2V_2=V_1\times\frac{k_1}{k_2}

For example, a US liquid gallon contains exactly 3.785411784 L, while an imperial gallon contains exactly 4.54609 L. The names are similar, but the sizes are not. US factors follow the NIST volume table.

Three useful checks

A drink bottle: 1.5 L equals 1,500 mL. This metric conversion moves the decimal point without introducing an approximation.

A tank drawing: 2 mยณ equals 2,000 L. The converter changes the unit, not the physical amount the tank can hold.

A US specification: 10 US liquid gallons equal 37.854118 L. Choosing imperial gallons instead would produce 45.4609 L, so the unit system belongs in the result.

Volume is not mass

A litre of water and a litre of oil have the same volume but different masses. Converting litres to kilograms requires the material's density, so this tool does not guess it.

The interface shows up to six decimal places and switches to scientific notation for extreme values. That keeps a tiny nonzero result visible, but it does not add accuracy to the original measurement. The barrel option is the US oil barrel of exactly 42 US liquid gallons.

Questions about volume conversion

The safest conversion keeps the number, unit name, and measurement system together.

Is one litre the same as one cubic decimetre?

Yes. One litre equals exactly one cubic decimetre, and one millilitre equals one cubic centimetre.

Are US and imperial gallons equal?

No. A US liquid gallon is 3.785411784 litres, while an imperial gallon is 4.54609 litres.

Can I convert litres to kilograms here?

No. That conversion also needs the material's density, which is not determined by volume alone.

Can I type in the converted field?

Yes. Both fields are editable, and the field changed most recently becomes the source value.

Why does a result use scientific notation?

A very small or very large value is shown that way so a nonzero quantity is not rounded away or displayed as an unwieldy line of digits.

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