Calculators for drives, gears and machines

Belts, chains, gears, worm and planetary drives, motors, hydraulics, screws and bolts. Every tool shows a live drawing, warns you when a value is out of range, and tells you how to fix it. Free, no sign-up, works on your phone.

ISO · DIN · ANSI · AGMA standardsmm and inchChecked against reference examples13 tools

Belts & chains

Belts & chainsPulley & Belt CalculatorBelt length, ratio, belt speed, standard V-belts and timing belts, multi-stage reduction.Belts & chainsChain & Sprocket CalculatorLinks, center distance for an even chain, sprocket sizes, chain pull and safety factor.

Gears

GearsSpur & Helical Gears CalculatorGear ratio, all diameters, profile shift, helix angle forces, gear trains and CAD export.GearsWorm Gear CalculatorRatio, lead angle, DIN 3975 dimensions, efficiency and self-locking check.GearsPlanetary Gear CalculatorAll six setups, speeds and torques, planet bearing speed, assembly check, ratio finder.GearsRack & Pinion CalculatorTravel per turn, linear speed, rack force, rack length and stepper resolution.

Motors & hydraulics

Motors & hydraulicsMotor Speed & VFD CalculatorSynchronous speed, slip, and speed, torque and power on a frequency inverter.Motors & hydraulicsHydraulic Cylinder CalculatorPush and pull force, speeds, return flow, pump power and rod buckling.

Linear motion & lifting

Linear motion & liftingLead & Ball Screw CalculatorDrive torque, linear speed, self-locking, critical speed and buckling.Linear motion & liftingBlock & Tackle CalculatorReal mechanical advantage with friction, pull force, rope length and anchor load.

Fasteners

FastenersBolt Torque CalculatorTightening torque, clamp force and stretch for ISO metric and UNC/UNF bolts.

Vehicles

VehiclesGearing & Differential CalculatorSpeed in every gear, RPM at cruise, final drive and differential in a turn.VehiclesU-Joint & Driveshaft CalculatorSpeed swing of cardan joints, Z and W layouts and phasing check.