Speed Converter
Convert road speeds, wind speeds and machining feed rates. Includes mm/min, inches per minute and surface feet per minute for CNC work.
Speed Converter
Convert between 11 speed units.
1 Kilometer per Hour = 0.62137119 Mile per Hour
1 km/h equals
0.62137119 mph
In every unit
Speed units in practice
Road speeds in Pakistan are in km/h, while US and UK sources use mph. Ships and aircraft use knots.
CNC feed rates are set in mm/min on most metric controllers and in inches per minute on American ones. Cutting speed for turning and milling is often given in m/min or surface feet per minute (SFM).
Speed unit reference
| Unit | Symbol | In meters per second |
|---|---|---|
| Meter per Second | m/s | 1 m/s |
| Kilometer per Hour | km/h | 0.27777778 m/s |
| Mile per Hour | mph | 0.44704 m/s |
| Knot | kn | 0.51444444 m/s |
| Foot per Second | ft/s | 0.3048 m/s |
| Meter per Minute | m/min | 0.016666667 m/s |
| Millimeter per Minute | mm/min | 0.000016666667 m/s |
| Inch per Minute | in/min | 0.00042333333 m/s |
| Surface Feet per Minute | SFM | 0.00508 m/s |
| Mach (sea level) | Ma | 340.29 m/s |
| Speed of Light | c | 299,792,460 m/s |
Frequently asked questions
How do I convert km/h to mph?
Multiply by 0.621371. For example, 120 km/h is about 74.6 mph.
How do I convert m/s to km/h?
Multiply by 3.6. A wind of 10 m/s is 36 km/h.
How do I convert a CNC feed rate from mm/min to inches per minute?
Divide by 25.4. A feed of 3,000 mm/min is about 118 inches per minute.
What is a knot?
One nautical mile per hour, exactly 1.852 km/h or about 1.151 mph.