# Acceleration Calculator

URL: https://speedycalculator.com/calculators/physics/acceleration/
Last updated: 2026-10-25

> The acceleration calculator finds average acceleration from a change in velocity over time, a = (v − u) ÷ t. Results are shown in m/s², ft/s² and g.

## Inputs

- Initial velocity (m/s, km/h, mph, ft/s, knots)
- Final velocity (m/s, km/h, mph, ft/s, knots)
- Time (s, min, h)

## Results

- Acceleration
- Distance covered

## Formula

```
a = (v − u) ÷ t
```

## Explanation

Acceleration is the rate of change of velocity. Braking is negative acceleration.

### How to use the Acceleration Calculator

- **Initial velocity**
- **Final velocity**
- **Time**
- Want to work backwards? Type a value into **Acceleration** and **Final velocity** is calculated for you.

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Subtract initial velocity from final velocity and divide by the time taken.

### Inputs explained

FieldWhat to enterInitial velocityUnits: m/s, km/h, mph, ft/s, knotsFinal velocityUnits: m/s, km/h, mph, ft/s, knotsTimeUnits: s, min, h

### What each result means

- **Acceleration** = ([Final velocity] - [Initial velocity]) ÷ [Time]
- **Distance covered** = ([Initial velocity] + [Final velocity])÷2 × [Time]

### Example values

How the main result changes when **Final velocity** changes and everything else stays at the example values above:

Final velocity (m/s)Acceleration (m/s²)13.891.7420.832.627.783.4734.724.3441.675.2155.566.94

## Worked example

Inputs — Initial velocity: 0 m/s; Final velocity: 27.7778 m/s; Time: 8 s.

Results — **Acceleration = 3.47 m/s²**; Distance covered = 111.11 m.

## FAQ

**What is 0–100 km/h in 8 seconds in g?**
About 0.35 g.

**What does negative acceleration mean?**
The object is slowing down in the direction of motion.

**What formula does the Acceleration Calculator use?**
a = (v − u) ÷ t.

**Can I work backwards from the result?**
Yes. Type the result you want into Acceleration and the calculator finds the matching final velocity.


## Sources

- [NIST – Fundamental physical constants](https://physics.nist.gov/cuu/Constants/)