Velocity Converter

One mile per hour is 1.609344 km/h, so 100 km/h displays as 62.1371 mph. One knot is one nautical mile per hour, 1.852 km/h.

The mile length itself is on the length converter. Fuel use at a speed is a different question.

Miles per hour and kilometers per hour

The factor is the statute mile, 1609.344 m, divided by 3600 seconds. Feet per second use 0.3048 m/s per ft/s.

Knots

A knot uses the nautical mile of 1852 m per hour. It is the speed unit for boats and aircraft, not a statute mile per hour.

Worked example: 100 km/h

From kilometers per hour to miles per hour, 100 km/h displays as 62.1371 mph. One knot displays as 1.852 km/h.

\[ 100\,\mathrm{km/h}=62.1371\,\mathrm{mph} \]

Frequently asked questions

References

• Wikipedia — Kilometres per hour
• https://en.wikipedia.org/wiki/Conversion_of_units

Assumptions and limitations

Speed only, six significant digits. No wind, pace, or travel-time estimate.