Volume Converter
Volume Converter translates L, mL, m³, US gal, US cup, and fl oz through litres. Gallon, cup, and fluid ounce are specifically US customary definitions in this implementation; imperial quantities are different. Volume conversion does not account for temperature expansion, density, or the mass of a substance.
Runs locally — files stay on your deviceHow many litres are in one US gallon?
Exactly 3.785411784 litres under the stored US liquid gallon definition.
Cubic and liquid-capacity units share a volume dimension
One cubic metre is 1000 litres. The tool uses 1 US gallon = 3.785411784 L, 1 US cup = 0.2365882365 L, and 1 US fluid ounce = 0.0295735296 L.
How it works
The entered value is normalized to litres and then scaled to the destination unit. Precision affects display only.
Key concepts
US and imperial units differ
A US gallon is not an imperial gallon.
Volume-to-mass needs density
One litre has different mass for different substances and conditions.
When to use it
- Translate US recipes to metric volume.
- Convert litres and cubic metres.
- Compare liquid container capacities.
When not to use it
- Do not use the results for imperial gallons or cups.
- Do not convert volume to mass without density.
- Do not assume a labelled cup always follows the US legal definition.
Worked examples
US gallon
- Input
1 US gal- Expected output
3.785411784 L
The US liquid definition is used.
Cubic metre
- Input
1 m³- Expected output
1000 L
A litre is one cubic decimetre.
Millilitres to cups
- Input
473.176473 mL- Expected output
About 2 US cups
Display rounding can affect the final digits.
Common mistakes
Choosing the wrong gallon
Imperial and US gallons differ. Correction: Confirm the measurement system.
Treating fl oz as mass ounce
One is volume and the other mass. Correction: Use Weight Converter for avoirdupois ounces.
Converting ingredients without density
Volume and mass are not interchangeable. Correction: Use a substance-specific density.
Best practices
- Label US units explicitly.
- Use mass-based recipes when precision matters.
- Round according to measuring-device resolution.
Related operations and differences
Area Converter
Choose Area Converter when you need to convert common metric and imperial areas.; use Volume Converter specifically for convert.
Data Storage Converter
Choose Data Storage Converter when you need to convert decimal and binary storage units.; use Volume Converter specifically for convert.
Energy Converter
Choose Energy Converter when you need to convert joules, calories and watt-hours.; use Volume Converter specifically for convert.
Fuel Economy Converter
Choose Fuel Economy Converter when you need to convert MPG, L/100 km and km/L.; use Volume Converter specifically for convert.
Length Converter
Choose Length Converter when you need to convert metric and imperial length units.; use Volume Converter specifically for convert.
Power Converter
Choose Power Converter when you need to convert watts, kilowatts and horsepower.; use Volume Converter specifically for convert.
Limitations and privacy
- US customary liquid units only.
- No imperial gallon, teaspoon, tablespoon, or density conversion.
- No temperature or compressibility correction.
Values are converted locally in this browser and are not uploaded.
Frequently asked questions
Which gallon is used?
US liquid gallon.
How many litres are in 1 m³?
1000.
Is a fluid ounce a mass?
No.
Can litres be converted directly to kilograms?
Only with density information.