💨

Speed Converter

Convert speed between mph, km/h, m/s, knots, and Mach number. Type in any field to update all others instantly.

Converter Tools Runs locally No data sent
mphkm/hm/sknotsMach
Speed
Miles per hour
mph
Kilometres per hour
km/h
Metres per second
m/s
Knots
kn
Feet per second
ft/s
Mach (sea level)
Mach
Quick examples
Speed reference
Referencemphkm/hm/s
Walking pace3.151.4
Cycling average12.4205.6
City speed limit315013.9
Motorway limit7011331.3
Usain Bolt (peak)27.844.7212.4
Speed of sound7671235343

What is a Speed Converter?

A speed converter translates a speed value between different units of measurement. Common units include miles per hour (mph, used in the US and UK), kilometres per hour (km/h, used in most countries), metres per second (m/s, the SI unit), knots (used in aviation and sailing), and Mach (a ratio to the speed of sound). This tool updates all units simultaneously when you type in any field.

How to Use Speed Converter

  1. Type a speed value into any field (mph, km/h, m/s, knots, ft/s, or Mach).
  2. All other fields update instantly with the converted values.
  3. Use the quick example buttons to load common reference speeds.
  4. Clear all fields with the Clear button to start over.

Related Tools

🌡️
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin. Type in any field to update the others.
 📐
Unit Converter
Convert length, weight, temperature, speed and more
 🌍
Time Zone Converter
Convert a time between any two time zones. Includes a world clock for 14 major cities.
 📈
Percentage Change
Calculate percentage increase or decrease between two values. Shows formula and absolute difference.
 🏛️
Roman Numeral Converter
Convert between Arabic numbers and Roman numerals instantly. Supports 1—999, works both ways.
Speed Units Explained ▾
Example
Input 100 km/h
Output 62.14 mph / 27.78 m/s / 53.99 kn
Common Use Cases
  • Converting car speed limits between mph and km/h for travel
  • Aviation: converting knots to km/h or mph
  • Physics and engineering: working in m/s
  • Checking athlete running or cycling speeds
Frequently Asked Questions
How many km/h is 60 mph?

60 mph = 96.56 km/h. To convert mph to km/h, multiply by 1.60934.

What is 1 knot in km/h?

1 knot = 1.852 km/h. Knots are used in aviation and maritime navigation.

What is Mach 1?

Mach 1 is the speed of sound at sea level —approximately 340.29 m/s, 1,235 km/h, or 767 mph. The exact value varies with air temperature and altitude.

How do I convert m/s to km/h?

Multiply m/s by 3.6. For example, 10 m/s × 3.6 = 36 km/h.