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Acceleration Calculator

Acceleration is the change in velocity per unit time, showing how quickly an object's motion changes. The unit is m/s².

Enter the initial velocity, final velocity, and elapsed time to instantly get the average acceleration. Useful for analyzing car acceleration or falling motion.

For example, going from rest (0 m/s) to 20 m/s in 4 s gives an acceleration of 5 m/s².

Acceleration Calculator

Acceleration Calculator Calculation Method

a = v - v_0 / t
a: acceleration, v0: initial velocity, v: final velocity, t: time
The acceleration (m/s²) is 0 .

About This Calculator

Acceleration is the rate at which velocity changes with time, measured in metres per second squared (m/s²). Positive acceleration speeds an object up, negative acceleration (deceleration) slows it down.

Enter the initial velocity, final velocity and elapsed time to find the average acceleration.

Useful real-world figures: a car reaching 100 km/h (27.8 m/s) in 10 seconds averages 2.78 m/s², a full ABS stop on dry tarmac is about 8 m/s², and a roller coaster pulls up to 3 g. From 100 km/h that braking rate needs roughly 48 metres, and doubling the speed quadruples the distance.

Key Formula:a = (v − u) / t

Frequently Asked Questions

Can an object accelerate while moving at a constant speed?

Yes. Acceleration is a change in velocity, and velocity includes direction. A car turning a corner at a steady 40 km/h is accelerating because its direction of travel keeps changing.

What is the acceleration due to gravity?

Near the Earth's surface, free-falling objects accelerate at about 9.8 m/s² (often rounded to 10 m/s² for estimates). This value is denoted g and decreases slightly with altitude and latitude.

What braking force does a full stop need?

The distance follows d = v² / (2a), so from 100 km/h with a = 8 m/s² it is about 48 metres. Wet tarmac cuts deceleration to around 5.5 m/s² and stretches the same stop beyond 70 metres, while snow at 2.5 m/s² needs more than 150 metres.

How do I convert 0–100 km/h into acceleration?

Convert the speed to metres per second (100 km/h = 27.78 m/s) and divide by the time. In 10 seconds that is 2.78 m/s² or 0.28 g; in 5 seconds it is 5.56 m/s². Average acceleration is total change in speed divided by total time.

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Sources & last update

2026-10-19