mechanical

Gear Ratio

Output RPM, torque, and gear ratio from driver/driven tooth counts.

Inputs

Driver Teeth N₁

teeth

Driven Teeth N₂

teeth

Input RPM (optional)

RPM

Input Torque (optional)

N·m

Results

Gear Ratio GR = N₂/N₁—

Output RPM—

Output Torque (ideal)—

GR = N₂/N₁ · ω_out = ω_in/GR · T_out = T_in × GR

Output torque assumes 100% efficiency.
Real-world: apply η ≈ 0.95–0.98 for spur gears.