Acceleration Calculator

Acceleration is worked out three ways here: from a change in velocity over a measured time, from the distance covered in that time, and from a net force acting on a mass. Enter the figures in whatever units you have, mixing miles per hour with seconds or pounds-force with kilograms, and the answer comes back in metres per second squared, feet per second squared, km/h per second and multiples of g. Each result shows the working and the converted SI values. The first two forms assume the acceleration held constant, so they give the average over the interval rather than the peak.

Calculator Type
Velocity Unit
Time Unit

The usual definition: how fast the velocity changed, divided by how long it took.

Use a negative number if the object starts out travelling the other way.
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Velocity Unit
Distance Unit
Time Unit

When you know how far it went and how long it took, rearranged from s = u t + 1/2 a t^2.

Enter 0 if it started from rest.
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Force Unit
Mass Unit

Newton's second law, a = F / m, with the force treated as the net force on the object.

The resultant after friction, drag and weight have been taken off. A negative value points the acceleration backwards.
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