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Plant Engineering Calculator

Pump Energy Cost Calculator — kWh, Annual Spend & Cost per Volume

Calculate pump electrical input from flow, head, density and overall efficiency, then annualize energy cost and cost per pumped volume.

Inputs

Results

Electrical input 26.15 kW
Annual energy 156906 kWh
Annual cost $15691
Annual volume 1080000 m³
Cost per 1,000 m³ $14.53

Formula

P=ρgQH/η; annual cost=P×hours×tariff.

Worked example

A 50 L/s water pump at 40 m head and 75% overall efficiency needs about 26.2 kW input before annualization.

Assumptions & limits

  • Overall efficiency should include pump and motor losses for electrical cost.
  • Actual duty can vary across the system curve; use a load profile for variable duty.

FAQs

What does this Pump Energy Cost Calculator calculate?

Calculate pump electrical input from flow, head, density and overall efficiency, then annualize energy cost and cost per pumped volume.

What should I verify before using the result?

Check units, operating point, measured site data and OEM limits. This calculator is a transparent screening tool, not a substitute for equipment selection or code-required design.

Why are intermediate results included?

Intermediate values expose the engineering chain so you can audit assumptions, compare scenarios and catch unrealistic inputs.

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Last updated: 2026-09-17