Online Speed Converter

Our free online Speed Converter allows you to convert between metric and imperial speed/velocity units instantly. Perfect for automotive, aviation, physics, sports, and travel. Convert km/h, mph, m/s, knots, and more with precision.

Features:

• Metric Units: Convert meters per second (m/s) and kilometers per hour (km/h).
• Imperial Units: Convert miles per hour (mph) and feet per second (ft/s).
• Nautical & Aviation: Convert knots (kn) and Mach numbers.
• Real-time Conversion: Instant results as you type.
• High Precision: Accurate calculations for professional use.

1. Understanding Speed Units

Metric (km/h): Kilometers per hour - used in most countries for road speeds.
Imperial (mph): Miles per hour - used in USA, UK for road speeds.
Scientific (m/s): Meters per second - SI unit, used in physics and engineering.
Nautical (knots): Nautical miles per hour - used in maritime and aviation (1 knot = 1.852 km/h).
Mach: Speed relative to sound (Mach 1 ≈ 1,235 km/h at sea level, varies with temperature).

2. Common Speed Conversions

KM/H to MPH: Multiply by 0.6214 (e.g., 100 km/h = 62.14 mph)
MPH to KM/H: Multiply by 1.609 (e.g., 60 mph = 96.56 km/h)
M/S to KM/H: Multiply by 3.6 (e.g., 10 m/s = 36 km/h)
KM/H to Knots: Multiply by 0.54 (e.g., 100 km/h = 54 knots)

3. Practical Applications

• Automotive: Speed limits, vehicle specifications, GPS readings
• Aviation: Aircraft speeds, wind speeds, flight planning
• Maritime: Ship speeds, ocean currents, navigation
• Sports: Running pace, cycling speed, racing statistics
• Physics & Science: Velocity calculations, projectile motion, experiments

4. Speed Benchmarks

• Walking: 5 km/h (3 mph)
• Jogging: 10 km/h (6 mph)
• City Driving: 50 km/h (30 mph)
• Highway: 100-130 km/h (60-80 mph)
• High-speed Train: 300 km/h (186 mph)
• Commercial Jet: 900 km/h (560 mph or Mach 0.85)
• Speed of Sound: 1,235 km/h (767 mph or Mach 1 at sea level)

5. Speed Conversion Tips

• For quick estimates: 100 km/h ≈ 60 mph (multiply km/h by 0.6)
• To convert mph to km/h quickly: add 60% (60 mph → 60 + 36 = 96 km/h)
• Knots are slower than km/h: 100 knots = 185 km/h
• Remember speed limits when traveling: 70 mph (USA) ≈ 110 km/h
• Running pace: 6 min/km ≈ 10 km/h ≈ 6.2 mph
• Mach number varies with altitude and temperature