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Complete speed tool with unit converter (mph/km/h/m/s), velocity calculator, pace converter, average speed finder & distance-time calculator. Free & instant results!
Convert between different speed units instantly
Quick reference for converting between common speed units:
| From | To | Multiply By | Example |
|---|---|---|---|
| mph (miles/hour) | km/h (kilometers/hour) | 1.60934 | 60 mph = 96.56 km/h |
| km/h | mph | 0.621371 | 100 km/h = 62.14 mph |
| m/s (meters/second) | km/h | 3.6 | 10 m/s = 36 km/h |
| m/s | mph | 2.23694 | 10 m/s = 22.37 mph |
| knots | km/h | 1.852 | 100 knots = 185.2 km/h |
| knots | mph | 1.15078 | 100 knots = 115.08 mph |
| ft/s (feet/second) | mph | 0.681818 | 100 ft/s = 68.18 mph |
Speed = Distance รท Time
v = d / t
Where: v = speed, d = distance, t = time
Example: 150 km รท 3 hours = 50 km/h
Distance = Speed ร Time
d = v ร t
Example: 60 km/h ร 2.5 hours = 150 km
Time = Distance รท Speed
t = d / v
Example: 200 km รท 80 km/h = 2.5 hours
Average Speed = Total Distance รท Total Time
v_avg = ฮฃd / ฮฃt
For multiple segments with different speeds:
Example: 50 km at 100 km/h (0.5 hr) + 100 km at 50 km/h (2 hr)
Average = 150 km รท 2.5 hr = 60 km/h
Velocity (vector) = Displacement รท Time
vโ = ฮxโ / ฮt
Speed is the magnitude of velocity (always positive)
Velocity includes direction (can be negative)
Convert between running pace (min/mile or min/km) and speed (mph or km/h):
Speed (mph) = 60 รท Pace (min/mile)
Speed (km/h) = 60 รท Pace (min/km)
Example: 8 min/mile pace = 60 รท 8 = 7.5 mph
| Pace (min/mile) | Speed (mph) | Pace (min/km) | Speed (km/h) |
|---|---|---|---|
| 5:00 | 12.0 mph | 3:06 | 19.3 km/h |
| 6:00 | 10.0 mph | 3:44 | 16.1 km/h |
| 7:00 | 8.6 mph | 4:21 | 13.8 km/h |
| 8:00 | 7.5 mph | 4:58 | 12.1 km/h |
| 9:00 | 6.7 mph | 5:35 | 10.7 km/h |
| 10:00 | 6.0 mph | 6:13 | 9.7 km/h |
| 12:00 | 5.0 mph | 7:27 | 8.0 km/h |
To convert miles per hour to kilometers per hour, multiply by 1.60934. For example: 60 mph ร 1.60934 = 96.56 km/h. Our calculator does this conversion instantly for all speed units.
Speed is calculated using the formula: Speed = Distance รท Time. For example, if you travel 100 km in 2 hours, your speed is 100 รท 2 = 50 km/h. Our calculator handles all unit conversions automatically.
Average speed = Total distance รท Total time. For multiple segments, add all distances and divide by total time. Example: 50 km in 1 hour + 100 km in 2 hours = 150 km รท 3 hours = 50 km/h average speed.
Our speed calculator is built using standard physics formulas verified by physics educators and engineers. All conversion factors follow international standards.
All conversions use precise multiplication factors (e.g., 1 mph = 1.609344 km/h exactly) as defined by international measurement standards. Results are calculated to multiple decimal places for scientific accuracy.
This calculator is regularly reviewed and updated to ensure accuracy. Last verified: December 2024. We maintain compliance with current international measurement standards.