Speed Conversion Formulas
Complete formulas for converting between different speed units including mph, kph, m/s, knots, and specialized velocity measurements.
đ Speed Unit Overview
Land Transportation
mph: Miles per hour (US/UK)
kph: Kilometers per hour (Metric)
m/s: Meters per second (Scientific)
Marine & Aviation
Knots: Nautical miles per hour
Mach: Speed of sound multiples
fps: Feet per second
Scientific
c: Speed of light
km/s: Kilometers per second
cm/s: Centimeters per second
Specialized
km/h: Alternative notation
fpm: Feet per minute
in/s: Inches per second
đ Primary Speed Conversion Formulas
MPH â KPH (Most Common)
MPH to KPH
Example: 60 mph
60 mph = 96.6 kph
KPH to MPH
Example: 100 kph
100 kph = 62.1 mph
Meters per Second (m/s) Conversions
MPH to m/s
Example: 30 mph
30 mph = 13.4 m/s
KPH to m/s
Example: 72 kph
72 kph = 20 m/s
â Marine & Aviation Speed Formulas
Knots Conversions
Knots to MPH
Example: 25 knots
25 knots = 28.8 mph
Knots to KPH
Example: 25 knots
25 knots = 46.3 kph
Knots to m/s
Example: 25 knots
25 knots = 12.9 m/s
Mach Number Conversions
Mach to m/s (at sea level)
Example: Mach 2
Mach 2 = 686 m/s
Mach to MPH
Example: Mach 1.5
Mach 1.5 = 1,151 mph
đ Feet per Second & Specialized Units
Feet per Second (fps) Conversions
fps to MPH
Example: 44 fps
44 fps = 30 mph
fps to m/s
Example: 100 fps
100 fps = 30.5 m/s
MPH to fps
Example: 60 mph
60 mph = 88 fps
Scientific Speed Units
Kilometers per Second
m/s to km/s
Example: 5000 m/s = 5 km/s
Orbital speeds typically in km/s
Speed of Light Reference
c = 299,792,458 m/s
In km/s: c = 299,792.458 km/s
As percentage: 1000 km/s = 0.33% of c
Used in particle physics
đ Speed Conversion Reference Table
| Speed | MPH | KPH | m/s | Knots | fps |
|---|---|---|---|---|---|
| Walking Speed | 3 | 4.8 | 1.3 | 2.6 | 4.4 |
| Cycling Speed | 15 | 24.1 | 6.7 | 13.0 | 22 |
| City Driving | 30 | 48.3 | 13.4 | 26.1 | 44 |
| Highway Speed | 70 | 112.7 | 31.3 | 60.8 | 103 |
| Commercial Jet | 550 | 885 | 246 | 478 | 807 |
| Speed of Sound | 767 | 1,235 | 343 | 667 | 1,125 |
đ¯ Common Speed Benchmarks
Transportation
School zones25 mph
Residential streets35 mph
Interstate highways70-80 mph
High-speed rail200+ mph
Natural Phenomena
Light breeze5-10 mph
Strong wind25-30 mph
Hurricane74+ mph
Tornado200+ mph
Sports & Animals
Running (sprint)20+ mph
Cheetah70 mph
Baseball pitch100 mph
Tennis serve130+ mph