Everyday & industry
Speed Converter
Convert a speed between common metric, imperial and navigation units. Optionally view an approximate pace reference.
Enter a speed, choose the source unit, and convert it instantly to another common speed unit.
Conversions use fixed mathematical relationships and do not require external data.
Results update as you edit. Calculations run locally in your browser; your inputs are not saved.
Choose your speed units.
Calculated locally · Speed Converter
Your Speed Conversion
The converted value represents the same speed expressed in another unit.
Result Detail
Conversion Breakdown
Source value × source-unit-to-metres-per-second factor ÷ target-unit-to-metres-per-second factor. Displayed decimals may be rounded; internal values are not.
Example: 100 kilometres per hour to miles per hour
Static example: 100 km/h ÷ 1.609344 = 62.1371192237… mph. The displayed value follows the chosen decimal precision.
About this calculator
Quick conversion references
These are static reference relationships, not results calculated from your inputs.
- 1 mph = 1.609344 km/h.
- 100 km/h ≈ 62.1371 mph.
- 1 m/s = 3.6 km/h.
- 1 ft/s = 1.09728 km/h.
- 1 knot = 1.852 km/h.
- 1 knot ≈ 1.15078 mph.
Metres per second as the internal unit
Each conversion first expresses the entered speed in metres per second, then converts to the requested unit. The table uses that same full-precision internal value for every row.
- 1 km/h = 1000 ÷ 3600 m/s.
- 1 mph = 0.44704 m/s.
- 1 ft/s = 0.3048 m/s.
- 1 knot = 1852 ÷ 3600 m/s.
- One knot is one nautical mile per hour.
How speed relates to pace
The optional reference expresses the time required to cover one kilometre or mile at the entered constant speed, rounded to the nearest second. It does not estimate race performance or prescribe a target pace.
Frequently asked questions
How do I convert kilometres per hour to miles per hour?
Divide km/h by 1.609344. For example, 100 km/h is approximately 62.137119 mph.
How do I convert miles per hour to kilometres per hour?
Multiply mph by 1.609344. For example, 60 mph is 96.56064 km/h.
How do I convert metres per second to kilometres per hour?
Multiply m/s by 3.6. For example, 10 m/s is 36 km/h.
How many kilometres per hour is one knot?
One knot is exactly 1.852 km/h.
What is a knot?
A knot is a speed of one nautical mile per hour, commonly used in navigation.
How can speed be converted to running pace?
For a positive speed in km/h, divide 3600 by km/h to get seconds per kilometre. Divide 3600 by mph to get seconds per mile. The optional reference formats these times; the separate Running Pace Calculator supports distance-and-time projections.
A deterministic speed conversion utility with an optional pace reference at constant speed. No GPS, routes, live vehicle data or performance recommendations.