Speed Converter
Convert between km/h, mph, m/s, knots, and other speed units.
About this tool
Understanding speed limits when driving abroad, converting running pace to treadmill settings, or interpreting wind speeds — the Speed Converter handles all common speed units.
How the Speed Converter works
The Speed Converter converts between 5 speed units: kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), knots (kn), and feet per second (ft/s). Each unit serves different contexts — road travel, athletics, maritime, and science.
How to use this tool
- Enter the speed value you want to convert.
- Select the source unit from the 'From' dropdown.
- Select the target unit from the 'To' dropdown.
- Click 'Convert' to see the result.
Common use cases
Converting speed limits when driving in a different country
Comparing treadmill speed (km/h or mph) with running pace (min/km or min/mile)
Understanding wind speeds in weather forecasts
Converting between knots and km/h for maritime navigation
Examples
- 100 km/h = 62.1 mph. 60 mph = 96.6 km/h. 1 knot = 1.852 km/h = 1.151 mph.
- Usain Bolt's 100m world record (9.58s): average speed 10.44 m/s = 37.6 km/h = 23.4 mph.
Tips & best practices
- To convert running pace (min/km) to speed (km/h): divide 60 by the pace. A 5:00/km pace = 60 ÷ 5 = 12 km/h.
- To convert running pace (min/mile) to speed (mph): divide 60 by the pace. An 8:00/mile pace = 60 ÷ 8 = 7.5 mph.
- Knots are used in maritime and aviation because they directly relate to nautical miles on charts (1 knot = 1 nautical mile per hour).
- The speed of sound at sea level is approximately 1,235 km/h (767 mph, 343 m/s, 667 knots).
Common mistakes to avoid
❌ Confusing knots with km/h — 20 knots ≠ 20 km/h. 20 knots = 37 km/h. The difference is significant for navigation.
❌ Treating m/s and km/h as directly comparable — 10 m/s = 36 km/h. Multiply m/s by 3.6 to get km/h.
Frequently Asked Questions
How many km/h is 60 mph?
60 mph ≈ 96.56 km/h. The exact conversion: multiply mph by 1.609344.
What is a knot?
A knot equals 1 nautical mile per hour = 1.852 km/h = 1.151 mph. It is the standard speed unit in maritime and aviation navigation.
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