Speed Converter
Convert between common speed units including meters per second, kilometers per hour, miles per hour, knots, and feet per second. All conversions use exact factors based on international definitions.
Speed conversion is important in physics, transportation, aviation, and marine navigation. Different fields use different units: scientists use m/s, drivers use km/h or mph, pilots and sailors use knots.
Key Conversion Factors
- 1 km/h = 1,000/3,600 m/s (exact)
- 1 mph = 0.44704 m/s (exact, based on 1 mile = 1,609.344 m)
- 1 knot = 1,852/3,600 m/s (exact, based on 1 nautical mile = 1,852 m)
- 1 ft/s = 0.3048 m/s (exact)
- 1 mph ≈ 1.60934 km/h
- 1 knot ≈ 1.15078 mph
Common Reference Speeds
- Walking: ~1.4 m/s = ~5 km/h = ~3.1 mph
- Highway driving: ~30 m/s = ~108 km/h = ~67 mph
- Speed of sound in air: ~343 m/s = ~1,235 km/h = ~767 mph