Unit Converters · Speed & Velocity
Speed Converter
Convert speed between kilometres per hour, miles per hour, metres per second, knots and feet per second using exact definitions.
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Quick start — try a typical case
Your result Live
1 Kilometers/hour =
0.6213711922 Miles/hour
1 Kilometers/hour = 0.6213711922 Miles/hour
- Meters/second
- 0.2777777778
- Knots
- 0.5399568035
- Feet/second
- 0.9113444153
How this is calculated
Result = Value × (m/s per 'from' unit) ÷ (m/s per 'to' unit)
- 1 km/h
- 1,000 m ÷ 3,600 s = 1/3.6 m/s exactly
- 1 knot
- 1 nautical mile (1,852 m) per hour = 1852/3600 m/s exactly
Speeds are converted through metres per second using exact definitions — 1 km/h is exactly 1/3.6 m/s and 1 knot exactly 1,852 m per hour — so 100 km/h is 62.13711922 mph, not a rounded approximation.
Assumptions & sources
- International mile and nautical mile; speeds are magnitudes (no direction).
- 1The International System of Units (SI Brochure) — BIPM
- 2NIST Handbook 44, Appendix C — General Tables of Units of Measurement — National Institute of Standards and Technology
Calculator ID UNIT-SPEED-001 · version 2.0.0
Common questions
How do I convert km/h to m/s?
Divide by 3.6. For example 90 km/h ÷ 3.6 = 25 m/s.
What is a knot?
One nautical mile (1,852 m) per hour — about 1.852 km/h or 1.151 mph. It's used at sea and in aviation.