# Momentum Calculator

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

> The momentum calculator finds linear momentum, p = mv, and the kinetic energy of a moving object. Type a momentum to solve for velocity.

## Inputs

- Mass (kg, lb, g, oz, st)
- Velocity (m/s, km/h, mph, ft/s, knots)

## Results

- Momentum
- Kinetic energy

## Formula

```
p = m × v
```

## Explanation

Momentum is conserved in collisions, which lets engineers and physicists predict what happens after impacts.

### How to use the Momentum Calculator

- **Mass**
- **Velocity**
- Want to work backwards? Type a value into **Momentum** and **Velocity** is calculated for you.

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

### How it works

Multiply mass by velocity.

### Inputs explained

FieldWhat to enterMassUnits: kg, lb, g, oz, stVelocityUnits: m/s, km/h, mph, ft/s, knots

### What each result means

- **Momentum** = [Mass] × [Velocity]
- **Kinetic energy** = 0.5×[Mass]×[Velocity]^2

### Example values

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

Velocity (m/s)Momentum (kg·m/s)202.9304.35405.8507.25608.78011.6

## Worked example

Inputs — Mass: 0.145 kg; Velocity: 40 m/s.

Results — **Momentum = 5.8 kg·m/s**; Kinetic energy = 116 J.

## FAQ

**Is momentum a vector?**
Yes, it has direction as well as size.

**What is impulse?**
The change in momentum, equal to force × time.

**What formula does the Momentum Calculator use?**
p = m × v.

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