Speed Converter Online
Free online speed and velocity converter. Convert between km/h, mph, knots, m/s, ft/s, and Mach. Instant, precise results.
⇄
Tip: Click any result row to instantly copy its value to clipboard
💡 Definition
Speed Converter
- Speed measures how fast an object moves over a given distance per unit of time.
- Common units include km/h (metric), mph (imperial), knots (maritime/aviation), and m/s (scientific).
- This tool converts between all major speed units instantly.
📖 How to use
Step by Step
- Enter a speed value and choose your source unit from the Convert From dropdown
- All equivalent speeds display instantly in the results grid
- The source unit row is highlighted in purple for clarity
- Click any result row to copy that value to your clipboard
🎯 Use cases
When to use
- Converting vehicle speed between km/h and mph
- Aviation and nautical speed calculations
- Physics and engineering velocity conversions
- Running pace and athletic performance tracking
Frequently Asked Questions
How many mph is 100 km/h?▾
100 km/h is approximately 62.137 mph. To convert km/h to mph, divide by 1.60934. This is close to the common highway speed limit in many countries.
What is a knot?▾
A knot is one nautical mile per hour (approximately 1.852 km/h or 1.151 mph). It is the standard unit for wind speed, ship speed, and aircraft airspeed.
What is Mach speed?▾
Mach 1 is the speed of sound, approximately 343 m/s (1,235 km/h or 767 mph) at sea level and 20°C. The exact value varies with temperature and altitude.