Speed Converter
Convert speed between m/s, km/h, mph, knot, ft/s units.
Input Information
Result
<strong>Speed Converter</strong> is a tool that provides accurate conversions between various speed units. You can quickly convert between meter/second (m/s), kilometer/hour (km/h), mile/hour (mph), knot, and foot/second (ft/s), and it is widely used from car, airplane, and wind speed to scientific calculations.
In physics and engineering, m/s is the standard, while in road traffic km/h is used, and in maritime and aviation, knots are used. This tool easily converts between these units to reduce communication errors.
For students and researchers, it serves as learning material for kinematics. For drivers, navigators, and weather forecasters, it is a practical tool. It is also very helpful when dealing with overseas vehicle specifications or wind speed data.
Conversion coefficients follow international standards. 1 m/s = 3.6 km/h, and 1 knot is the speed of traveling 1 nautical mile (1.852 km) in 1 hour, i.e., 1.852 km/h. When selecting units, distinguish according to the nature of the measurement target.
Term Glossary
- Knot and Nautical Mile
- A knot is the speed of traveling 1 nautical mile (1.852 km) in 1 hour (1.852 km/h). It is used in aviation and maritime, and should be distinguished from land km/h.
- Mile (mph)
- A speed unit used in English-speaking road systems, where 1 mph = 1.609344 km/h. It is used when comparing US/UK vehicle specifications and wind speed.
- Choose the input unit (m/s, km/h, mph, knot).
- Enter the speed value you want to convert.
- Choose the output unit.
- Press convert and the result is displayed instantly.
100 km/h Conversion
100 km/h = about 27.78 m/s = about 62.14 mph.
1 Knot Conversion
1 knot = about 1.852 km/h.
10 m/s Conversion
10 m/s = 36 km/h.
Speed Unit Conversion Relationships
Speed Unit Conversion Relationships
Converting 100 km/h to m/s:
100 km/h ÷ 3.6 = 27.78 m/s
Everyday Speed Comparisons
- Walking approx. 5 km/h, Bicycle 15~25 km/h, Highway 100~120 km/h
- Speed of sound approx. 1,235 km/h (343 m/s)
Unit Usage by Application
- km/h: Road traffic in most countries
- m/s: Scientific calculations and physics, mph: US/UK roads
- knot: Aviation and maritime traffic
Wind Speed Notation
- Weather forecasts mainly use km/h or m/s.
- Strong wind criteria are wind speed of 17 m/s (approx. 61 km/h) or higher.
Vehicle Performance Comparison
- 0→100 km/h acceleration time can be compared by converting to m/s².
- Braking distance calculations are more accurate in m/s units.
Aviation and Maritime Use
- Takeoff speed and navigation speed are managed in knot units.
- Useful for calculating actual speed considering wind speed and counter-currents.
Learning Tips
- Understand the difference between speed (scalar without direction) and velocity.
- Check the dimensions of the formula before unit conversion.
QHow do I convert m/s to km/h?
Multiply the m/s value by 3.6 to get km/h. For example, 10 m/s is 36 km/h. Conversely, divide by 3.6 to convert km/h to m/s.
QWhat is a knot?
A knot is a speed unit used in aviation and maritime, where 1 knot equals one nautical mile (about 1,852 m) per hour. So 1 knot is about 1.852 km/h.
QHow do mph and km/h differ?
mph measures speed in miles and is mainly used in the US and UK. 1 mph is about 1.609 km/h. Conversely, 1 km/h is about 0.6214 mph.
QHow does this compare to the speed of sound?
At sea level, the speed of sound is about 1,225 km/h (about 340 m/s), which equals Mach 1. This is very fast compared to typical car or aircraft speeds.
QWhich speed unit is used where?
Aviation uses knots internationally, road speeds use mph in the US and UK, and km/h in most other countries. Science and engineering often use m/s.