Speed converter — km/h, m/s, mph, knots, Mach
Convert speed between km/h, m/s, mph, knots and Mach. Fast online speed unit converter — free, no registration required.
Current for 2026Methodology →
Speed Calculator
The speed calculator works out average speed from the distance travelled and the time taken. Enter the distance in metres and the time in seconds, and the tool returns the speed in metres per second (m/s), in kilometres per hour (km/h), and the pace expressed in minutes per kilometre. The calculator uses the formula v = s / t and assumes uniform motion — a constant speed over the whole route. It is useful for physics problems, for planning running and cycling training, and for estimating travel time.
Na tej stronie
How we calculate speed
Speed in m/s = distance / time. Speed in km/h = speed(m/s) × 3.6. Pace (min/km) = (time in minutes) / (distance in kilometres). Results are rounded to two decimal places.
Example: 1000 m in 100 s
For a distance of 1000 m covered in 100 s, the average speed is 1000 / 100 = 10 m/s. Converted to km/h: 10 × 3.6 = 36 km/h. The pace is (100 / 60) / (1000 / 1000) = 1.67 min/km.
Frequently asked questions
How do I calculate average speed from distance and time?
Divide the distance travelled by the time taken: v = s / t. With distance in metres and time in seconds, the result is in m/s. For example, 1000 m in 100 s equals 10 m/s.
How do I convert m/s to km/h?
Multiply the m/s value by 3.6. One m/s equals 3.6 km/h. For instance, 10 m/s is 36 km/h.
What is pace in minutes per kilometre?
Pace (min/km) is the time needed to cover one kilometre. The lower the value, the faster you are. It is widely used in running and cycling.
How do I convert speed to pace?
Pace (min/km) = 60 / speed(km/h). For example, 12 km/h corresponds to a pace of 5 min/km.
What units does the calculator accept?
Distance in metres and time in seconds. Outputs are m/s, km/h and pace in min/km.
What is uniform motion?
Motion at constant speed, covering equal distances in equal intervals of time. The calculator assumes this model.
Is average speed the same as instantaneous speed?
No. Average speed covers the whole segment, while instantaneous speed is the value at a given moment. In real motion they can differ.
How do I find distance or time?
Distance = speed × time, and time = distance / speed. These rearrange the basic formula v = s / t.
What is the speed calculator used for?
Physics problems, planning running and cycling training, and estimating travel time over a known route.
The calculator assumes uniform motion (constant speed). Real-world motion may vary, and instantaneous speed can differ from the computed average speed.
Related calculators
Pace to Speed Calculator — runner's converter
Convert running pace (min/km) to speed (km/h) and back. Also calculates pace per mile. Free instant running calculator — no signup.
Velocity and Acceleration Calculator (kinematics)
Calculate average velocity, distance, time or acceleration. Formulas: v = s/t, s = v*t, t = s/v, a = (v-v0)/t. Results in m/s, km/h, m/s2 and g-fraction. Free physics calculator.