How it works
One cubic metre is 1,000 litres. A US liquid gallon is exactly 3.785411784 litres and contains 128 US fluid ounces.
Result = value × source factor / target factor
Worked example
Show example inputs and result
Value: 100 · From unit: L · To unit: mL.
- Converted value
- 100,000 mL
Questions and answers
Is the gallon the same in every country?
No. This tool uses US liquid gallons. Imperial gallons and dry gallons have different volumes and are not offered here.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Conversion reference: NIST SI Guide
Method reviewed: October 8, 2026 · Methods & accuracy