Momentum & Impulse Calculator
Compute an object's initial and final momentum (p = mv), the impulse (change in momentum), and the average force applied over the time of the change.
Inputs explained
- Mass (kg) — The object's mass in kilograms.
- Initial velocity (m/s) — Velocity before the impulse, in metres per second.
- Final velocity (m/s) — Velocity after the impulse, in metres per second.
- Time (s) — How long the velocity change takes, in seconds (used for average force).
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: A 2 kg object accelerating from 3 m/s to 7 m/s gains 8 kg·m/s of momentum; over 2 seconds that requires an average force of 4 N.
Frequently asked questions
What's the difference between momentum and impulse here? Momentum (p = mv) is a snapshot of an object's motion at one instant, while impulse is the change between the initial and final momentum values — it's what the average force acted over the given time to produce.
Can the average force come out negative? Yes, if the final velocity is less than the initial velocity the momentum change is negative, meaning the force was decelerating the object rather than speeding it up.
Is the Momentum & Impulse Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Mass (kg), Initial velocity (m/s), Final velocity (m/s), Time (s). Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Momentum & Impulse Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.