Aviation Speed Converter: Knots, MPH, KPH
Convert aircraft airspeeds, groundspeeds, and rates of climb instantly across Knots, MPH, KPH, Meters per Second, and Feet per Minute.
Aviation Speed Converter
How to Convert Aviation Speed Units
Aviation operations, flight planning, and meteorology rely on various speed measurements depending on the aircraft type, operational phase, and regional airspace regulations. This tool provides instant translation between five primary units of speed and velocity:
- Knots (kt): The standard international unit for maritime and aerial navigation. One knot equals one nautical mile per hour.
- Miles per Hour (mph): Imperial unit primarily used by legacy aircraft, North American general aviation piston aircraft, and structural aircraft wind limit ratings.
- Kilometers per Hour (km/h): Metric speed unit used by aircraft manufactured in specific international regions and for select civilian airspace operations.
- Meters per Second (m/s): Scientific SI metric unit commonly utilized in glider operations, performance testing, and international wind or gust reporting.
- Feet per Minute (ft/min): The global standard aviation unit for tracking an aircraft’s vertical speed, specifically its rate of climb or rate of descent.
Aviation Speed Applications
Accurate speed conversion is vital for flight computer verification, tracking structural limits, and navigating varying international air traffic control rules.
| Application | Primary Units Used | Operational Context |
| En-Route Navigation | Knots (kt) | Used for Groundspeed (GS), True Airspeed (TAS), and Indicated Airspeed (IAS) operational limits. |
| Vertical Performance | Feet per Minute (ft/min) | Monitored via the Vertical Speed Indicator (VSI) to maintain target climb gradients and descent profiles. |
| General Aviation V-Speeds | Miles per Hour (mph) | Often featured on airspeed indicators (ASIs) of legacy aircraft to track safe structural limits (e.g., Vs, Vne). |
| Meteorological Reports | Knots / Meters per Second | Reporting wind velocities, crosswind components, runway wind gusts, and severe wind shear indicators. |
Complete Speed Conversion Formulas
Knots (kt) Conversions
- Knots to Miles per Hour: MPH = Knots × 1.15078
- Knots to Kilometers per Hour: KPH = Knots × 1.852
- Knots to Meters per Second: M/S = Knots × 0.514444
- Knots to Feet per Minute: Ft/Min = Knots × 101.2686
Miles per Hour (mph) Conversions
- Miles per Hour to Knots: Knots = MPH × 0.868976
- Miles per Hour to Kilometers per Hour: KPH = MPH × 1.60934
- Miles per Hour to Meters per Second: M/S = MPH × 0.44704
- Miles per Hour to Feet per Minute: Ft/Min = MPH × 88
Kilometers per Hour (km/h) Conversions
- Kilometers per Hour to Knots: Knots = KPH × 0.539957
- Kilometers per Hour to Miles per Hour: MPH = KPH × 0.621371
- Kilometers per Hour to Meters per Second: M/S = KPH × 0.277778
- Kilometers per Hour to Feet per Minute: Ft/Min = KPH × 54.6807
Meters per Second (m/s) Conversions
- Meters per Second to Knots: Knots = M/S × 1.94384
- Meters per Second to Miles per Hour: MPH = M/S × 2.23694
- Meters per Second to Kilometers per Hour: KPH = M/S × 3.6
- Meters per Second to Feet per Minute: Ft/Min = M/S × 196.85
Feet per Minute (ft/min) Conversions
- Feet per Minute to Knots: Knots = Ft/Min × 0.009871
- Feet per Minute to Miles per Hour: MPH = Ft/Min × 0.0113636
- Feet per Minute to Kilometers per Hour: KPH = Ft/Min × 0.018288
- Feet per Minute to Meters per Second: M/S = Ft/Min × 0.00508
Speed Units Quick Reference Matrix
| From Unit | To Knots (kt) | To MPH | To KPH | To M/S | To Ft/Min |
| 1 Knot | 1 | 1.15078 | 1.852 | 0.514444 | 101.2686 |
| 1 MPH | 0.868976 | 1 | 1.60934 | 0.44704 | 88 |
| 1 KPH | 0.539957 | 0.621371 | 1 | 0.277778 | 54.6807 |
| 1 M/S | 1.94384 | 2.23694 | 3.6 | 1 | 196.85 |
| 1 Ft/Min | 0.009871 | 0.0113636 | 0.018288 | 0.00508 | 1 |