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

Hydraulic Power Watts (W)

Required number input.

Shaft Power Watts (W)

Required number input.

Pump hydraulic efficiency from hydraulic output power divided by shaft input power. 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]

Efficiency Percent (%)

The resulting efficiency percent returned as a number.

• Fan, pump, turbine, and propeller performance varies with speed, flow, head, density, efficiency map, cavitation margin, installation, control, and off-design operation. Similarity or ideal-power equations do not replace manufacturer curves.
• 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.

• Pump Hydraulic Power

  Hydraulic output power ρgQH delivered by a pump, excluding shaft and motor losses.

• Transformer Efficiency Simple

  Transformer efficiency as output real power divided by input real power.

• Chiller Cop

  Chiller coefficient of performance as cooling output divided by electrical input power, in matching power units.