🚀 Speed Converter
From a US speed limit in mph to wind speed in knots while sailing: convert any speed exactly between km/h, mph, m/s and knots. Handy for travel, sports, weather reports and shipping.
Result
62.137 mph
Formula
Result = (value × from-factor) ÷ to-factor, relative to m/s
Every speed unit has a fixed conversion factor to metres per second: 1 km/h = 1 ÷ 3.6 m/s (≈ 0.277778 m/s), 1 mph = 0.44704 m/s and 1 knot = 0.514444 m/s. The calculator converts your value to m/s first and then to the target unit.
Steps
- 1Enter the speed you want to convert.
- 2Choose the unit to convert from and to: km/h, mph, m/s or knots.
- 3Read the exact result instantly.
Speed units in metres per second
| Unit | In m/s |
|---|---|
| 1 m/s | 1 |
| 1 km/h | 0.277778 |
| 1 mph | 0.44704 |
| 1 knot | 0.514444 |
Km/h and knots are derived units; m/s is the SI base unit of speed.
commonMistakes
- Confusing knots (nautical miles per hour) with mph (statute miles per hour); a knot is slightly faster than one mph.
- Forgetting to divide km/h by 3.6 when converting to m/s (a common physics-class mistake).
- Mixing up wind speed and vehicle speed: weather reports often give wind in knots or Beaufort, not km/h.
useCases
- Converting a US speed limit (mph) to km/h for a road trip.
- Converting wind speed from a marine forecast (knots) into km/h.
- Comparing a running or cycling pace in m/s with the speed shown on a traffic sign.