Gears
Ratio, speed, and torque for simple gear pairs, plus full geometry and ISO 6336 load rating for cylindrical gears.
Start from ratio, speed, or output torque, then define module, tooth counts, angles, and profile shifts before performing a strength rating.
Calculators in this category
Cylindrical Gear Geometry
Calculate cylindrical gear geometry and contact ratios.
Open calculator →Cylindrical Gear Load Rating (ISO 6336)
Estimate contact and tooth-root stress from torque, geometry and ISO 6336 factors.
Open calculator →Span Measurement over k Teeth (ISO 21771-2)
Calculate the span measurement Wk of an external cylindrical gear over k teeth, with the recommended number of teeth to span, the limits from the tooth thickness allowances and a minimum face width check for helical gears.
Open calculator →Gear Ratio Calculator from Tooth Counts
Calculate the ratio of a spur gear pair from the tooth counts and see the direction of the output shaft.
Open calculator →Gearbox Output Speed Calculator
Calculate the gearbox output speed from input speed and gear ratio.
Open calculator →Gearbox Output Torque Calculator
Calculate gearbox output torque from input torque, gear ratio and efficiency.
Open calculator →Worm Gear Ratio Calculator
Calculate the ratio of a worm drive from worm wheel tooth count and number of worm starts.
Open calculator →Worm Gear Efficiency Calculator
Calculate the mesh efficiency of a worm drive with driving worm from lead angle and friction angle.
Open calculator →Planetary Gear Calculator with Fixed Ring Gear
Calculate the carrier speed of a simple planetary gear set with a fixed ring gear.
Open calculator →