Gear Speed Calculator
Calculate Output RPM
Output RPM = Input RPM × (Driving Teeth / Driven Teeth)
Find Gear Teeth for Desired RPM
Driven Teeth = Driving Teeth × (Input RPM / Desired Output RPM)
Two-Stage Gear Train
Final RPM = Input RPM × (T1_drive/T1_driven) × (T2_drive/T2_driven)
Formula
Output RPM = Input RPM × (Driving Teeth / Driven Teeth) | Gear Ratio = Driven Teeth / Driving Teeth
Frequently Asked Questions
How do I calculate gear output speed?
Output RPM = Input RPM × (Driving Teeth / Driven Teeth). For example, if the motor runs at 1800 RPM with a 20-tooth driving gear and 60-tooth driven gear: Output = 1800 × (20/60) = 600 RPM.
What is a gear ratio?
Gear ratio = Driven Teeth / Driving Teeth. A ratio greater than 1:1 means speed reduction (more torque). A ratio less than 1:1 means overdrive (more speed). A 3:1 ratio means the output is 1/3 the speed but 3× the torque.
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