Speed Converter
Convert between km/h, mph, m/s, knots, and other speed units.
Overview
Convert speed between metres per second, kilometres per hour, miles per hour, knots, and feet per second. Speed unit conversion is needed in transportation, aviation, athletics, physics, and international vehicle spec comparison. The tool converts all units simultaneously from a single input value.
Common use cases
- Convert vehicle top speed specs between km/h and mph for international comparison.
- Translate race pace from m/s to km/h for running analytics.
- Convert wind speed from knots to km/h for weather interpretation.
- Check aircraft speed limits reported in different unit conventions.
Examples and notes
- 100 km/h is approximately 62.1 mph — common speed limit comparison.
- A 4-minute kilometre pace is 15 km/h or 9.3 mph.
- One knot equals 1.852 km/h — used in maritime and aviation speed reporting.
Important note
Knots are defined relative to nautical miles. Do not use knots outside of maritime and aviation contexts where nautical miles are the expected distance unit.
Frequently Asked Questions
How many km/h is 60 mph?
60 mph ≈ 96.56 km/h. To convert mph to km/h, multiply by 1.60934.
What is a knot and who uses it?
A knot equals 1 nautical mile per hour = 1.852 km/h. Knots are used in maritime navigation and aviation worldwide.
How fast is the speed of sound in km/h?
The speed of sound at sea level (at 15°C) is approximately 1,235 km/h (767 mph or 340 m/s).
What is a typical cruising speed for a commercial aircraft?
Commercial airliners cruise at approximately 900–920 km/h (about 560–570 mph or 490–500 knots) at altitude.