Skip to content
Calculator tabs
Online Gear CalculatorsPick a card and start calculating

Choose a calculator card and open its page with “Use”

Each calculator has its own card. The “Use” button opens that tool page where you can start calculations and add notes or visuals if needed.

Module Calculator

Active
Module

Module recommendation and checks based on gear size, tooth count, and quality.

Gear Ratio Calculator

Active
Ratio

Ratio, rpm, and torque relation from z1/z2 or d1/d2.

Tangential Force / Torque Calculator

Active
Force

Calculates Ft = 2·T/d (Ft = 2000·T/d for T in N·m and d in mm) plus Fr/Fa components.

Helical Axial Force Calculator

Active
Helix

Calculates Fa using helix and pressure angles; bearing load estimate.

Contact Ratio Calculator

Active
Contact

Estimates contact sequence with e_alpha + e_beta (profile + overlap).

Lubricant Viscosity Selector

Active
Lubrication

ISO VG and lubrication method recommendation from ks and v values.

Gear Weight / Body Optimization

Active
Weight

Weight and savings estimate using geometry + pocket/rib data.

Backlash Calculator

Active
Backlash

Min/nom/max backlash with module, center distance, and temperature input.

Similar calculators

Related calculators

Explore calculators with similar categories or tags.

Bolt Size & Torque

Free

Calculate stress area and preload from nominal diameter, pitch, and grade.

Tolerance Lab

Free

Analyze linear tolerance stacks with worst-case, RSS, and sensitivity contribution views.

Spring Force Chart

Free

Generate an F-x chart from spring constant and displacement.

Tensile Stress

Free

Compute tensile stress from force and cross-section area.

Other picks

These might help too

Review alternative calculators for adjacent needs.

Power - Torque - RPM

Free

Compute torque or power from kW, hp, and rpm.

Shaft Torsion

Free

Compute torsional stress and twist angle from torque and shaft size.

Gear Force & Torque

Free

Compute gear torque and transmitted forces.

Unit Converter

Free

Fast unit conversions for length, force, pressure, and energy.