m/s · km/h · mph · ft/s · knot · Mach
Free Speed Converter
Convert speed units instantly — km/h, mph, m/s, knots, Mach, ft/s. Type into any field and all others update. Free, symmetrical, no sign-up.
Why symmetrical conversion?
How This Converter Works
Speed is measured in different units depending on context — km/h and mph for vehicles, m/s for physics, knots for maritime and aviation, and Mach for supersonic speeds. All 6 units update simultaneously.
Quick reference
Common Conversions
| m/s | km/h | mph | Context |
|---|---|---|---|
| 1.4 m/s | 5 km/h | 3.1 mph | Walking speed |
| 4.5 m/s | 16.2 km/h | 10 mph | Cycling speed |
| 27.8 m/s | 100 km/h | 62.1 mph | Highway speed limit (Europe) |
| 44.7 m/s | 160.9 km/h | 100 mph | Fast car on track |
| 340 m/s | 1,224 km/h | 761 mph | Speed of sound (Mach 1) |
FAQ
Frequently Asked Questions
1How do I convert km/h to mph?
Multiply by 0.621371. So 100 km/h = 62.14 mph. For a quick mental estimate, multiply by 0.6 or divide by 1.6.
2What is a knot in km/h?
One knot equals 1.852 km/h or 1.151 mph. Knots are used in aviation and maritime contexts because they are based on nautical miles.
3What is Mach 1?
Mach 1 is the speed of sound, approximately 343 m/s (1,235 km/h or 767 mph) at sea level at 20°C. The exact value varies with temperature and altitude.
4How do I convert mph to m/s?
Multiply by 0.44704. So 60 mph = 26.82 m/s. The reverse: multiply m/s by 2.237 to get mph.
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