Gear Ratio Calculator

⚙ Gear Ratio Calculator

Enter gear teeth counts and motor specs — results update instantly

Drive Gear Teeth (T₁) input / motor side

Driven Gear Teeth (T₂) output / load side

Input RPM optional

Input Torque Nm — optional

Gearbox Efficiency % — default 97

Gear Ratio

—

: 1

Output RPM

—

RPM

Output Torque

—

Nm (actual)

📐 Worked Example

Conveyor drive: 15-tooth pinion → 45-tooth spur gear, 1,450 RPM input, 10 Nm, 97% efficiency

GR = 45 ÷ 15 = 3:1 | Output RPM = 1,450 ÷ 3 = 483 RPM | Output torque = 10 × 3 × 0.97 = 29.1 Nm