Calculate reducer output torque, output speed, and transmitted horsepower using motor torque, motor speed, gear ratio, and gearbox efficiency.
This calculator is useful for motor and reducer selection, conveyor drives, rotary mechanisms, servo systems, and torque multiplication estimates.
It helps estimate reducer output torque, output speed, and transmitted horsepower for motors driving gear reducers. It is useful for conveyor design, rotary indexing tables, automation machinery, servo drives, and industrial power transmission systems.
This helps with reducer sizing, conveyor design, rotary mechanisms, servo applications, and confirming whether the selected transmission gives enough torque multiplication.
Enter the torque and speed available from the motor or upstream drive before applying the reducer ratio.
Use the reducer ratio or calculated gear ratio. Higher ratios increase output torque while reducing output speed.
Real gearboxes lose power through friction, gear mesh losses, seals, lubrication, and bearings. Efficiency keeps the estimate more realistic.
Compare the output torque and RPM against manufacturer ratings, service factor, duty cycle, thermal limits, and shock load.
Enter motor torque, motor speed, gear ratio, and gearbox efficiency. The calculator estimates output shaft torque, output speed, and transmitted horsepower.
Save setups, reload prior inputs, and reuse common checks.
Output torque is estimated as motor torque multiplied by gear ratio and efficiency. This is a practical engineering estimate and does not account for shock loading, service factor, thermal limits, backlash, or peak acceleration loads.
A reducer can appear strong enough based on steady-state output torque but still be wrong for the application if the machine has high inertia, frequent start-stop cycles, product jams, indexing motion, reversing loads, or impact conditions.
Use this calculator as a first-pass output estimate, then verify the actual reducer against catalog ratings, application service factor, duty cycle, allowable overhung load, mounting orientation, lubrication requirements, and thermal limits.
This calculator is great for a first-pass estimate, but real gearbox selection still needs more review. After getting output torque and speed, you should check service factor, allowable overhung load, duty cycle, acceleration demand, and the manufacturer’s continuous and peak ratings.
This matters even more in conveyors, indexing tables, and high-inertia systems where startup loads or repeated reversals can stress the reducer far more than steady-state calculations suggest.
Get connected with a qualified automation integrator if you are sizing a reducer, matching a motor to a conveyor, or checking whether a gearbox can support a real application.
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