mechanics
Kinetic Energy Calculator
Use one six-mode workspace for angled work, kinetic energy, gravitational potential energy, power, mechanical-energy conservation, and efficiency; solve any supported variable.
Calculator
Formula
W = Fd cosθ; K = ½mv²; U = mgh; P = E/t; Kᵢ+Uᵢ = Kf+Uf; η = Eout/Ein
- Eₖ — Kinetic energy
- J · kJ
- m — Mass
- kg · g · mg
- v — Speed
- m/s · km/h
Assumptions and limits
- Select the matching physical model; conservation mode assumes no non-conservative work, while losses are represented explicitly only by efficiency mode.
Example
A 1,000 kg car at 20 m/s
The calculator starts with an editable example.
Sources
- University Physics Volume 1 — OpenStax
Frequently asked questions
Are my inputs uploaded?
No. This calculator runs locally in your browser. Inputs are placed in a URL only when you explicitly copy a share link.
Why are units converted first?
Canonical units prevent scale errors when inputs use mixed units. The result is converted back to your selected output unit afterward.
Does the result replace professional judgment?
No. The result applies only to the stated model and assumptions. Qualified people should review high-risk engineering, medical, or laboratory decisions.