Speed Converter
Convert between different speed units with precision
Conversion
1 m/s = 3.59999712 km/h
Quick Reference
| Meter per Second | Kilometer per Hour |
|---|---|
| 1 m/s | 3.59999712 km/h |
| 5 m/s | 17.9999856 km/h |
| 10 m/s | 35.9999712 km/h |
| 25 m/s | 89.999928 km/h |
| 50 m/s | 179.999856 km/h |
| 100 m/s | 359.999712 km/h |
Speed?
Speed is how quickly an object moves, measured as the distance covered per unit of time. Given the distance an object travels and the time it takes, you can determine its "rate" of motion. Importantly, speed does not account for direction; it only indicates how fast something is moving, regardless of where it is headed. That's why speed is classified as a scalar quantity. When direction is considered, the term becomes velocity, a vector. Speed is a common concept in daily life: it's the speed of a car on the road, a runner's pace during a race, wind and ocean currents, and the cruising speed of airplanes and ships.
Understanding How Speed Is Measured
Speed is calculated by dividing the distance traveled by the elapsed time.
Core Formula
Speed = Distance ÷ Time
This simple relationship underpins most speed calculations, whether measuring a sprint or tracking a satellite's motion.
Practical Speed Measurement
Measure the distance traveled, such as 100 meters, 5 kilometers, or 60 miles. Record the time taken in seconds, minutes, or hours, and compute the speed by dividing the distance by the time, yielding a value expressed as "distance per unit of time."
Tools Used to Measure Speed
Various tools are used in different situations. Below are some of the most common:
- Speedometers (vehicles): estimate speed from wheel rotation or sensor data.
- GPS devices and apps: determine speed by tracking changes in position over time.
- Radar/Lidar guns: measure speed by detecting reflected waves and are widely used for traffic enforcement.
- Timing gates (sports): record the time taken to cover a known distance.
- Scientific sensors: precisely monitor motion in labs, engineering tests, and experiments.
Average Speed vs. Instantaneous Speed
- Average speed: total distance divided by total time for the entire trip.
- Instantaneous speed: the speed at a specific moment, as shown on a speedometer.
Example: Driving 60 km in 1 hour yields an average speed of 60 km/h, regardless of fluctuations in speed during that hour.
Units of Speed Explained
Speed is always expressed as distance per unit of time, such as "kilometers per hour" or "meters per second." Different fields prefer different units depending on the context (cars, aircraft, ships, sports, and physics).
Below are clear definitions of common speed units.
Meters per Second (m/s)
The standard metric unit of speed in science and physics, representing how many meters an object travels in one second. Its brevity makes it ideal for precise calculations, and it is frequently used in formulas involving motion, force, and energy. It is commonly encountered in physics problems, engineering tests, and scientific measurements.
Kilometers per Hour (km/h)
A widely used unit of speed that measures how far something travels in an hour. It is convenient for road travel because it aligns with typical vehicle speeds. Many countries use km/h on speed-limit signs and vehicle dashboards. You'll also find it on road signs, in cars, and on cycling speedometers.
Miles per Hour (mph)
A standard unit of speed in countries that use miles for distance, especially the United States, where it remains in use on some roads. It indicates how many miles are traveled in one hour and is commonly used for speed limits and on car dashboards, with miles as the primary unit of distance. mph appears on US road signs, vehicle speedometers, and sometimes in weather updates.
Knot (kn)
A unit of speed used primarily in aviation and maritime contexts. It equals one nautical mile per hour. Because nautical miles are based on Earth's shape, knots are practical for navigation and mapping. This helps pilots and sailors relate speed to charts, coordinates, and routes. Knots are commonly used to indicate the speed of ships and aircraft, and they also appear in marine weather updates.
Feet per Second (ft/s)
A unit of speed commonly used in engineering, construction, ballistics, and certain sports where feet are the standard unit. It measures how far an object travels in one second and is especially useful for quickly assessing fast-moving objects that require precision. You can find it in technical data, sports stats, and engineering formulas.
Speed is a key measure of motion because it links two everyday experiences: distance and time. Whether you're checking a car's dashboard, planning a trip, evaluating athletic performance, or doing physics calculations, speed lets you describe motion accurately and compare different types of motion.