Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Torque Newton Meters (N·m)

Required number input.

Speed Rpm (rpm)

Required number input.

Mechanical shaft power from torque and revolutions per minute using P=T·2πn/60. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Power Watts (W)

The resulting power watts returned as a number.

• A compact formula cannot establish code compliance, safety, durability, manufacturability, or fitness for service. Boundary conditions, material variability, tolerances, dynamic and fatigue effects, environmental exposure, uncertainty, and failure modes may require a fuller model and governing standard.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Motor Torque From Power

  Shaft torque from mechanical shaft power and rotational speed: T=P/(2πn/60).

• Cutting Speed

  Cutting surface speed in meters per minute from rotating tool or workpiece diameter in millimeters and spindle RPM.

• Fan Power

  Ideal fan shaft power from volumetric airflow times pressure rise divided by overall fan efficiency.