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Kinetic energy calculator

Compute kinetic energy from mass and velocity (½mv²).

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Kinetic energy chicken cookerA famous physics joke, made calculable: could you cook a chicken by throwing it? Each throw deposits kinetic energy ½mv²; cooking it needs enough heat to raise it to 74 °C (Q = m·c·ΔT). It reports the energy per throw and how many throws — at your chosen speed — the meal would take.Potential energy calculatorCompute gravitational potential energy from mass, height and gravity (E = mgh).Spring potential energy calculatorCompute the elastic potential energy stored in a spring (E = ½kx²).E = mc² Calculator (Mass–Energy)Convert mass into energy and back with a realistic efficiency — 100 % for antimatter, 0.7 % for fusion, 0.09 % for fission — and read the result in joules, kWh, kcal and tonnes of TNT.Photon Energy CalculatorEnter a wavelength, a frequency or an energy and get all three from E = hf = hc/λ, in eV, keV, MeV and joules, with the spectral band named and the colour identified for visible light.Centripetal force calculatorCompute the centripetal force on an object moving in a circle (F = mv²/r).Escape velocity calculatorCompute the escape velocity of a body from its mass and radius.Momentum calculatorCompute momentum from mass and velocity (p = mv).

Enter Mass (kg), Velocity (m/s) and the Kinetic energy calculator works out Kinetic energy (J) straight away. For instance, with Mass (kg) = 2 and Velocity (m/s) = 10 it returns Kinetic energy (J) = 100.

How to use it

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

Frequently asked questions

What does the Kinetic energy calculator actually compute?

It takes Mass (kg) and Velocity (m/s) and derives Kinetic energy (J) 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) = 2 and Velocity (m/s) = 10, the calculator returns Kinetic energy (J) = 100. 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) = 2 and Velocity (m/s) = 20 instead, Kinetic energy (J) goes from 100 to 400 — 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) = 2 and Velocity (m/s) = 5, Kinetic energy (J) comes out at 25. 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 Kinetic energy calculator and the Kinetic energy chicken cooker?

This one returns Kinetic energy (J); the Kinetic energy chicken cooker returns Kinetic energy per throw (J) and Energy to cook (J). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Potential energy calculator is the closest one after this: Compute gravitational potential energy from mass, height and gravity (E = mgh).

What else is worth having open alongside it?

Spring potential energy calculator and E = mc² Calculator (Mass–Energy) — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
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.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 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.ExplainerHooke's Law Explained: F = kx, Real Spring Constants, and Where It Stops HoldingHooke's law says force is proportional to stretch — but only below the elastic limit. Here is F = kx with worked numbers, what a 200 N/m spring actually feels like, and how springs combine.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.