Velocity Calculator

This velocity calculator works with the simplest and most useful equation of motion, that average velocity equals distance divided by time, and solves it for whichever of the three quantities you need. Velocity is how fast something moves in a given direction, and for motion along a straight line it is the same number as speed, which is what most everyday problems involve. You choose whether to solve for the velocity, the distance or the time, then enter the other two and the calculator returns the answer: distance over time for velocity, velocity times time for distance, and distance over velocity for time. The result is an average over the whole trip, so it smooths out any speeding up and slowing down along the way. The only thing to keep an eye on is units, which must be consistent: metres and seconds give a velocity in metres per second, while kilometres and hours give kilometres per hour, and you should not mix the two without converting first. This is a staple of physics study and a handy everyday tool for working out travel times, average speeds and how far you will get in a set time. For motion that changes speed at a steady rate, the kinematics calculators handle acceleration as well. Enter your two known values to see the result straight away.

Use consistent units, for example metres and seconds for metres per second. Estimate only.