How does the Motor Sizing Calculator work?

Calculate: P = (T × RPM) / 5252 for mechanical power Then: Apply service factor 1.15-1.25 for continuous duty Then: Select standard motor size meeting service factor requirement.

Can you give an example of how to use the Motor Sizing Calculator?

Example: Input Pump load 7.5 kW continuous, service factor 1.25 gives a result of Motor = 7.5 × 1.25 = 9.4 kW, select 10 kW standard motor (Next size up).

Is the Motor Sizing Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Motor Sizing Calculator?

Our Motor Sizing Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Uzmanlaşmış

Motor Sizing Calculator

Torque (in-lbs)

RPM

Motor sizing matches horsepower to load requirements. Over-sizing wastes energy; under-sizing risks overheating and failure.

Symbol	Name	Unit	Description
P	(T × RPM) / 5252 for mechanical power	—	(T × RPM) / 5252 for mechanical power
T	T value	—	Variable used in the calculation
RPM	RPM value	—	Variable used in the calculation

Difficulty:intermediate

References

›Motor Sizing — Wikipedia

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