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CalcLab

Volume Converter

Convert between metric and US liquid volume units.
l
gallon
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No results yet — Enter values and run the tool to see results.

What is this converter?

Converts volume between metric units (millilitre, litre, cubic centimetre, cubic metre), imperial cubic units, and US liquid measures. All conversions pass through the litre.

Use it when:

  • A recipe or fuel figure uses a volume unit you do not work in.
  • You are converting between litres and US gallons.
  • You need cubic metres for a shipping or capacity calculation.

Intended for: Cooks, drivers, shippers, and anyone converting liquid or bulk capacity.

How is this calculated?

  1. Each supported unit is defined by a fixed conversion factor relative to one base unit for the quantity (for example, the metre for length).
  2. The value you enter is first converted from the source unit into that base unit by multiplying by the source unit's factor.
  3. The base value is then converted into the target unit by dividing by the target unit's factor.
  4. Because both factors are exact constants, the conversion is a single deterministic multiplication and division — the same input always produces the same output.

Example

Converting 10 litres to US gallons.

  1. 1 US liquid gallon is exactly 3.785411784 litres.
  2. 10 ÷ 3.785411784 ≈ 2.6417.

Result: 10 litres ≈ 2.64 US gallons.

Frequently asked questions

Is this the US gallon or the imperial gallon?

The US liquid gallon (3.785 litres). The imperial gallon used in the UK is 4.546 litres — about 20% larger — and is not in this list.

Is a millilitre the same as a cubic centimetre?

Yes, exactly. One millilitre is one cubic centimetre by definition.

Assumptions

What this converter takes as given:

  • Conversion factors are the internationally standardised definitions of each unit, not regional or historical variants.
  • The value you enter is treated as an exact quantity — no measurement uncertainty is carried through the conversion.
  • Results are rounded only for display; the underlying arithmetic uses full precision.

Limitations

What this converter cannot know or does not model:

  • The converter does not know the precision of your original measurement, so it cannot report significant figures for you.
  • Units that share a name but differ by region or era (for example, different definitions of a gallon or a ton) are offered only in the variants listed in the unit menu.
  • Very large or very small magnitudes are subject to the limits of double-precision floating-point arithmetic.

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