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Momentum calculator

Compute momentum from mass and velocity (p = mv).

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Enter Mass (kg), Velocity (m/s) and the Momentum calculator works out Momentum (kg·m/s) straight away. For instance, with Mass (kg) = 10 and Velocity (m/s) = 5 it returns Momentum (kg·m/s) = 50.

How to use it

  1. Enter your values: Mass (kg), Velocity (m/s).
  2. Read the result instantly: Momentum (kg·m/s).

Frequently asked questions

What does the Momentum calculator actually compute?

It takes Mass (kg) and Velocity (m/s) and derives Momentum (kg·m/s) from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Mass (kg) and Velocity (m/s). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Mass (kg) = 10 and Velocity (m/s) = 5, the calculator returns Momentum (kg·m/s) = 50. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Mass (kg) = 11 and Velocity (m/s) = 10 instead, Momentum (kg·m/s) goes from 50 to 110 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Mass (kg) = 9 and Velocity (m/s) = 3, Momentum (kg·m/s) comes out at 27. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Checking a homework answer, sizing something before building it, and getting an order of magnitude before committing to a design — a torque on a bolt, the force a spring returns, the frequency a circuit resonates at, how long light takes to arrive.

What is the most common mistake?

Feeding in a value in the wrong unit. Physics formulas assume SI throughout, so grams instead of kilograms or centimetres instead of metres shifts the answer by powers of ten without any warning.

What is the difference between the Momentum calculator and the Centripetal force calculator?

This one returns Momentum (kg·m/s); the Centripetal force calculator returns Centripetal force (N). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Escape velocity calculator is the closest one after this: Compute the escape velocity of a body from its mass and radius.

What else is worth having open alongside it?

Kinetic energy calculator and Orbital velocity calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
GuideThe Four Kinematics Equations: Which One to Use, and What Each One Leaves OutFive variables, four equations, and each equation is missing exactly one of them. Choose by looking at the variable the question never mentions.ExplainerProjectile Motion Explained: Range, Height, Flight Time — and Why 45° Is Not Always BestThree formulas cover the whole of projectile motion on level ground. The catch is level ground: the moment launch and landing heights differ, the 45° result stops being true.ExplainerWhat Is Kinetic Energy? The KE = ½mv² Formula ExplainedKinetic energy is the energy of motion, given by KE = ½mv². Learn what the formula means, why speed matters most, and see worked examples in joules.ExplainerWhat Is Horsepower? Mechanical hp, Metric PS, and kWHorsepower measures the rate of doing work. Learn where the unit came from, how mechanical hp differs from metric PS/CV, and how both relate to kilowatts.ExplainerHow the Doppler Effect Works: The Formula, the Sign Convention, and Why Moving the Source Is Not the Same as Moving the ListenerFor sound, f' = f(v + v_o)/(v − v_s) — and getting the signs backwards is the classic error. Here is the convention spelled out, a 440 Hz source computed at four speeds, and why light needs a different equation entirely.ExplainerWhat Is the Reynolds Number? The Formula, the Units That Cancel, and Why 2 300 Is Only for PipesRe = ρvL/μ compares inertia with viscosity, and the units really do cancel. See the number worked out for honey, a household pipe, an artery, a swimmer and a wing — and why the 2 300 threshold belongs to pipe flow alone.