Speed Converter
Convert any speed to any other speed unit: km/h, mph, m/s, ft/s, knots, even Mach. We use m/s as the internal base for accurate results.
Enter the speed you have.
All values will sync below.
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Switch the “From unit” to reverse convert.
Formulas we use
m/s is our base.
km/h = m/s × 3.6
mph = m/s × 2.236936
ft/s = m/s × 3.28084
knots = m/s × 1.943844
Mach = m/s ÷ 340.29 (approx. speed of sound at 20°C, sea level)
If you need a different Mach reference (altitude, temperature), convert to m/s here and then divide by the correct speed of sound for your conditions.
Common speed conversions
| km/h | mph | m/s | knots |
|---|
Table uses the exact same factors as the converter to avoid mismatches.
When do you need speed conversions?
Speed shows up everywhere: car specs (mph / km/h), running pace (m/s), aviation and nautical navigation (knots), physics problems (m/s), even engineering datasheets. Having a single, reliable tool saves you from memorizing several factors.
Accuracy note
All factors above are standard and widely used. For aviation/nautical work or performance-critical simulations, always check if your organization uses a slightly different knot or Mach reference.
FAQ
1. Are knots the same everywhere?
Yes, 1 knot = 1 nautical mile per hour = 1.852 km/h = 0.514444 m/s.
2. Why do I see a slightly different mph factor elsewhere?
Because sometimes mph is rounded differently. We use 1 m/s = 2.236936 mph, which is standard.
3. Can this convert pace (min/km)?
Not directly — this tool is for speed. Convert your speed to km/h or m/s, then invert to get time per distance.