The size of a portable router is determined by which specification?

• A. weight
• B. bit diameter
• C. horsepower rating of the motor
• D. speed setting

Answer: (C)

The size of a portable router is determined by motor horsepower. The horsepower rating shows how much power the motor can deliver, which in turn drives the need for a larger, more robust motor housing, cooling, and components. That direct relationship means higher HP routers are physically larger to accommodate the stronger motor and greater torque. Bit diameter only determines what bits you can use, not the tool’s overall size. Speed setting changes how fast the bit spins, but not the router’s dimensions. Weight reflects design choices and materials, not the fundamental size classification.