About this calculator
Find momentum, mass or velocity.
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
p = m × v; impulse = F × t = change in momentum
- m
- mass
- v
- velocity
Worked example
A 160 g cricket ball at 140 km/h
- 140 km/h = 38.89 m/s.
- p = 0.16 × 38.89 = 6.22 kg·m/s.
What the result means
Catching with soft hands spreads the change in momentum over a longer time, so the force is smaller.
Assumptions
- Speeds far below light speed.
Limitations
- Momentum has direction; this calculator works with its size.
Frequently asked questions
What is the unit of momentum?
kg·m/s, the same as N·s.
What is impulse?
Force × time, equal to the change in momentum.
Is momentum always conserved?
Yes, in any collision when no outside force acts.
Last reviewed on 6 October 2026. Found a mistake? Tell us.