Speed Converter
Convert between meters per second, kilometers per hour, miles per hour, feet per second, knots, and more.
Table of Contents
Common Speed Conversions
Quick reference for frequently used speed conversions.
| From | To | Result |
|---|---|---|
| 1 m/s | km/h | 3.6 km/h |
| 1 km/h | mph | 0.6214 mph |
| 1 mph | km/h | 1.6093 km/h |
| 1 knot | km/h | 1.852 km/h |
| 1 Mach | m/s | 343 m/s |
| 1 ft/s | m/s | 0.3048 m/s |
| 100 km/h | mph | 62.14 mph |
| 1 km/h | m/s | 0.2778 m/s |
How to Use Our Unit Converter
- Select the category you want to convert (Length, Weight, Temperature, Area, Volume, or Time) by clicking the corresponding tab.
- Enter your value in the "From" field.
- Select the source unit and destination unit from the dropdown menus.
- See the result instantly — no need to click any button.
- Use the swap button to reverse the conversion direction.
About Speed Conversion
Speed is the rate at which an object covers distance. The most commonly used speed units include meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), feet per second (ft/s), and knots (kn).
The SI unit of speed is meters per second (m/s). Kilometers per hour (km/h) is widely used for road speeds, while miles per hour (mph) is common in the United States and United Kingdom. Knots are used in aviation and maritime navigation.
To convert between speed units, use these key relationships: 1 m/s = 3.6 km/h, 1 km/h = 0.621371 mph, 1 knot = 1.852 km/h, 1 Mach ≈ 343 m/s.
Frequently Asked Questions
How do I convert km/h to mph?
Select "Kilometer per Hour" as the source unit and "Mile per Hour" as the destination. Enter your value and the result appears instantly. As a rule of thumb, divide km/h by 1.609 to get mph.
What is the difference between km/h and m/s?
Kilometers per hour (km/h) measures speed in kilometers traveled per hour. Meters per second (m/s) is the SI unit measuring meters traveled per second. To convert, divide km/h by 3.6 to get m/s.
How fast is Mach 1?
Mach 1 is the speed of sound, which is approximately 343 m/s, 1,235 km/h, or 767 mph at sea level in standard conditions (20°C).
What are knots used for?
Knots are primarily used in aviation and maritime navigation. One knot equals one nautical mile per hour, which is exactly 1.852 kilometers per hour or approximately 1.151 miles per hour.
Is this speed converter free?
Yes, this converter is completely free and uses precise conversion factors. All calculations happen in your browser with no data sent to any server.
Can I convert the speed of light?
Yes! The converter includes the speed of light (c) as a unit. The speed of light in vacuum is approximately 299,792,458 m/s or about 1,079,252,849 km/h.