Mechanics & Energy Calculators
Five calculators covering the core of classical mechanics — force, moment, work, power and energy, all in consistent SI units.
One chain of ideas, five tools
These are not five unrelated formulas — they are one chain. A Force Calculator applies F = m·a. Apply that force at a distance from a pivot and you get a moment, from the Torque Calculator. Move the force through a distance and you have done work, from the Work Calculator. Divide that work by the time it took and you have power, from the Power Calculator. Give the mass a velocity and the energy is kinetic, from the Kinetic Energy.
Units are where the marks are lost
Every tool here works in SI base units: newtons, metres, seconds, kilograms, joules and watts. Mixing grams with metres, or millimetres with newtons, produces an answer that is out by a factor of a thousand and looks entirely plausible. Convert first with the Weight Converter or the Length Converter, then calculate.
Torque and work share a formula but not a meaning
Both are force multiplied by distance, and both come out as newton-metres dimensionally — but torque is a rotational effect measured in N·m and work is energy measured in joules. They are not interchangeable. The distinction is direction: in work the force acts along the displacement; in torque it acts perpendicular to the lever arm.
Going further
For material behaviour under those loads, move to the Stress Calculator and the rest of the materials tools. Every formula on this page is listed with its symbols on the engineering formulas reference reference page.