⚙ Hardware · Engineer · Interactive Tool

Gear Ratio Calculator

Input your motor cartridge, gear stages, and wheel size — get output RPM, top speed, torque multiplier, and a visual gear diagram.

Quick presets

Fast drivetrain (600 → 36:48)

Balanced drivetrain (200 direct)

Intake rollers (600 direct)

Arm low-torque (100 → 1:5)

Arm high-torque (100 → 1:36)

Motor

Cartridge

Wheel diameter (in)

Stage 1

Driver teeth Driven teeth

Stage 2 (opt)

Driver teeth Driven teeth

Stage 3 (opt)

Driver teeth Driven teeth

0.75

Gear Ratio

450

Output RPM

—

Speed (ft/s)

—

Speed (in/s)

1.33×

Torque Mult.

Drivetrain (fast) — typical use for this configuration