Velocity Calculator
Calculate final velocity with v = u + at, or average velocity from displacement and time. Enter your values to solve for speed in m/s.
Final velocity (v = u + a·t)
30 m/s
In km/h
108 km/h
Velocity in m/s. Multiply by 3.6 for km/h. A negative value indicates motion in the opposite direction.
Frequently Asked Questions
How do you calculate final velocity?
Use the kinematic equation v = u + a·t, where u is the initial velocity, a is the acceleration, and t is the time. The result is the velocity in metres per second (m/s).
What is the difference between speed and velocity?
Speed is how fast something moves regardless of direction, while velocity is speed with a direction. In one-dimensional motion they share the same magnitude, but velocity can be negative to indicate the opposite direction.
How do you calculate average velocity?
Average velocity is total displacement divided by total time: v_avg = Δx / Δt. For constant acceleration it also equals the average of the initial and final velocities, (u + v) / 2.
What is the formula v = u + at?
It is the first equation of motion for constant acceleration. The final velocity v equals the initial velocity u plus the acceleration a multiplied by the elapsed time t.
What units does velocity use?
The SI unit of velocity is metres per second (m/s). To convert to km/h, multiply by 3.6; to convert to mph, multiply by about 2.237.