Simple Machine Calculators
Free, practical tools for every simple machine — find a lever’s mechanical advantage, a pulley system’s effort force, a gear ratio, a ramp’s force, a wheel-and-axle’s torque, and a screw’s mechanical advantage.
Lever Calculator
Find a lever's mechanical advantage and the effort force needed to lift a load, from the effort and load arm lengths measured from the fulcrum.
Pulley Calculator
Find a pulley system's mechanical advantage and effort force from the number of supporting rope segments, with an optional efficiency figure.
Gear Ratio Calculator
Turn a pair of gear tooth counts into a gear ratio, and see the resulting output speed and torque if you supply an input speed or torque.
Inclined Plane Calculator
Find a ramp's mechanical advantage, angle, and the force needed to push a load up it, with an optional friction coefficient.
Wheel & Axle Calculator
Convert an effort force applied at a wheel's rim into the load it can turn at the axle, plus the resulting torque.
Screw Calculator
Find a screw's mechanical advantage from the turning lever-arm length and the screw's pitch, plus the effort force needed.
Simple Machines Reference
All six machines side by side — each formula, a worked example at typical values, and what's traded for the force change — computed live from the calculators above.