TorqueMath

Calculators for drives, gears and machines

Belts, chains and every kind of gear, shafts and bearings, motors and hydraulics, plus speeds, feeds, taps and fits for the machine shop. Every tool draws your design live and tells you exactly what to fix.

19free tools
ISO · AGMAstandards
mm + inchunits
Nosign-up
live 3D · move your mouse over it

Belts & chains2 tools

Pulley & Belt CalculatorBelt length, ratio, belt speed, standard V-belts and timing belts, multi-stage reduction.
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Chain & Sprocket CalculatorLinks, center distance for an even chain, sprocket sizes, chain pull and safety factor.
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Gears5 tools

Spur & Helical Gears CalculatorGear ratio, all diameters, profile shift, helix angle forces, gear trains and CAD export.
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Worm Gear CalculatorRatio, lead angle, DIN 3975 dimensions, efficiency and self-locking check.
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Planetary Gear CalculatorAll six setups, speeds and torques, planet bearing speed, assembly check, ratio finder.
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Rack & Pinion CalculatorTravel per turn, linear speed, rack force, rack length and stepper resolution.
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Bevel Gear CalculatorStraight bevel cone angles, blank dimensions (Gleason), speeds and bearing forces for any shaft angle.
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Shafts & bearings2 tools

Bearing Life CalculatorL10 life in hours (ISO 281), equivalent load, reliability factor and required load rating.
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Shaft Diameter CalculatorShaft size for torque and bending with shock factors and keyway, plus twist and deflection check.
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Motors & hydraulics2 tools

Motor Speed & VFD CalculatorSynchronous speed, slip, and speed, torque and power on a frequency inverter.
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Hydraulic Cylinder CalculatorPush and pull force, speeds, return flow, pump power and rod buckling.
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Linear motion & lifting2 tools

Lead & Ball Screw CalculatorDrive torque, linear speed, self-locking, critical speed and buckling.
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Block & Tackle CalculatorReal mechanical advantage with friction, pull force, rope length and anchor load.
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Fasteners1 tools

Bolt Torque CalculatorTightening torque, clamp force and stretch for ISO metric and UNC/UNF bolts.
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Machining3 tools

Speeds & Feeds CalculatorSpindle RPM, feed rate, metal removal and cutting power for turning, milling and drilling.
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Tap Drill Size CalculatorDrill for metric, UNC and UNF taps, cutting or forming, with 6H check and blind hole depth.
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ISO Fits & Tolerances CalculatorHole and shaft limits for H7/g6, H7/p6 and any ISO 286 fit, plus shrink-fit temperature.
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Vehicles2 tools

Gearing & Differential CalculatorSpeed in every gear, RPM at cruise, final drive and differential in a turn.
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U-Joint & Driveshaft CalculatorSpeed swing of cardan joints, Z and W layouts and phasing check.
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See it, not just numbers

Every calculator draws your parts to scale and animates them, so a wrong input looks wrong straight away.

Tells you what to fix

Out-of-range fields blink red, show the allowed limits and suggest the change, instead of a silent “NaN”.

Checked against standards

Formulas follow ISO, DIN, ANSI and AGMA, and each tool is tested against published worked examples.