About this calculator
The calculator also gives the distance covered while accelerating and the acceleration in g.
How to use it
- Choose what to find, enter the other values with their units, and read the answer in every common unit.
The formula
a = (v − u) ÷ t; v = u + at; s = (u + v) ÷ 2 × t
- u
- initial velocity
- v
- final velocity
- t
- time
- a
- acceleration
Worked example
A car from 0 to 100 km/h in 10 s
- 100 km/h = 27.78 m/s.
- a = 27.78 ÷ 10 = 2.78 m/s², about 0.28 g; it covers 138.9 m.
What the result means
A negative acceleration means slowing down. 1 g (9.81 m/s²) is the acceleration of free fall.
Assumptions
- Constant acceleration.
Limitations
- Real vehicles accelerate unevenly, so this gives the average.
Frequently asked questions
What is the unit of acceleration?
Metres per second squared (m/s²).
What is deceleration?
Negative acceleration: the final velocity is lower than the initial one.
What are the equations of motion?
v = u + at, s = ut + ½at² and v² = u² + 2as, for constant acceleration.
Last reviewed on 6 October 2026. Found a mistake? Tell us.