MPH to KMH Converter - Speed Tool
Precise Speed Conversions • Visual Speedometer • Real-world Benchmarks
Quick Conversions
Convert speeds between miles per hour (mph) and kilometers per hour (km/h) with precision. Essential for international travel, understanding speed limits, athletic training, and converting between imperial and metric speed measurements.
How to Use
- Enter the speed value
- Select conversion direction (mph to km/h or km/h to mph)
- View the instant conversion result
- Use the conversion formula: 1 mph = 1.60934 km/h
- Reference the conversion table for common speeds
Features
- Bidirectional conversion (mph ↔ km/h)
- Precise calculations to multiple decimal places
- Conversion formula and explanation
- Table of common speed conversions
- Supports decimal inputs
- Real-time conversion as you type
- Includes speed limit comparisons
- Mobile-friendly interface
Common Use Cases
- International travel and car rental
- Understanding foreign speed limits
- Running and cycling speed tracking
- Automotive specifications comparison
- Aviation and nautical speed conversions
- Athletic training and race pacing
- Weather reports (wind speed)
- GPS and navigation systems
Tips & Best Practices
1 mph = 1.60934 km/h (exact conversion)
1 km/h = 0.621371 mph (exact conversion)
Quick mental math: 1 mph ≈ 1.6 km/h
Highway speed: 60 mph ≈ 100 km/h
Most countries use km/h, US and UK use mph
Speed limits: 30 mph ≈ 50 km/h (urban), 70 mph ≈ 110 km/h (highway)
Running pace: 6 mph ≈ 10 km/h (10-minute mile)
Conversion Guide & FAQs
Mile is a bigger unit than Kilometer.
1 mile per hour = 1.609 kms per hour .
1 km per hour = 0.621 miles per hour .
1 mile per hour = 0.447 meters / sec.
1 km per hour = 0.277 meters/sec
Most countries use the metric system (kms, meters) while the US uses miles per hour.
This is the System international (SI) unit for measuring speed.
It is the standard measurement.
Miles and Kilometer are units of distance.
Miles per hour (mph) and kilometers per hour (kmh or kph) are units of speed in the metric system which is the distance travelled in a specified duration of time.
Speed (in mph) = Distance travelled (in miles) / Time (in hours) .
Speed (in kph) = Distance travelled (in kms) / Time (in hours) .
The SI unit for speed is in meters/second.
Knot is used as measure of speed in sea (1 nautical mile per hour).
Nautical mile measures distance in sea.
1 Knot is equal to 1.15 miles per hour and 1.85 kms/hour.
Mach is used in aviation as a percentage to speed of sound .
An average human walking speed is 3 miles per hour (around 5 kms/hour and 1.3 meters/sec)
The fastest clocked in a running rac is 27.5 mph (44.25 kms/hour and 12.3 m/s).
The average running speed of human beings will be the range of 5-6 mph.
Speed of light 299,792,458 metres per second or 300,000 kms / hour, 186451.21 miles per hour .
Speed of sound 343 meters / sec, 1234.8 kms / hr, 767 miles per hour .
Mach is the (speed of object / speed of sound). It is mostly used in aviation .
1 Mach = speed of sound which is 332 m/s or 1195 km/hr or 717 miles/hour .
Supersonic 1.2 – 5.0 Mach .
Hypersonic between 5.0 - 10.0 Mach .
The SI Unit of both speed and velocity is meters/sec.
Speed is a scalar unit and it measures the distance covered over a period of time.
Velocity is the net displacement over a period of time.
If a person walks 100 steps eastward in 1 min and 100 steps westward in 1 min, then net displacement is 0 and velocity is 0 .
