How it works
One metre per second is 3.6 kilometres per hour. One mile per hour is 1.609344 kilometres per hour.
Result = value × source factor / target factor
Worked example
Show example inputs and result
Value: 100 · From unit: km/h · To unit: m/s.
- Converted value
- 27.77777778 m/s
Questions and answers
What does a knot mean?
A knot is one nautical mile per hour, exactly 1.852 kilometres per hour. The tool converts speed, not travel duration.
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