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Speed Converter
Convert between knots, miles per hour, kilometres per hour, metres per second, and feet per second. Enter any value and select your unit.
How it works
All conversions use metres per second (m/s) as a canonical intermediate value, which avoids rounding errors when chaining between units. The results shown maintain full floating-point precision internally and are formatted for readability.
Units supported
- Knots (kn) — the standard unit for maritime and aviation speed. 1 knot = 1 nautical mile per hour.
- Miles per hour (mph) — used in the US and UK for road and some nautical contexts.
- Kilometres per hour (km/h) — the SI-derived unit used internationally.
- Metres per second (m/s) — the SI base unit; used in scientific and engineering contexts.
- Feet per second (ft/s) — common in US engineering and some aviation contexts.
Reference values
- 1 knot = 1.15078 mph = 1.852 km/h = 0.514444 m/s = 1.68781 ft/s
- A typical cruising yacht: 6–8 knots
- A fast motor vessel: 20–30 knots