Electric Motor Efficiency, Loss Segregation & Energy Waste Calculator
Calculate electric motor losses (copper, iron core, friction), IEC efficiency classes (IE1–IE5), and wasted power costs.
Last reviewed by the myCalculator Editorial Team
Input Parameters
e.g. 22 kW (30 HP) motor
4,000 hrs/yr is typical 2-shift commercial operation; 8,000 hrs is continuous 24/7
Calculation Results
Visual Growth Breakdown
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Formula & How Electric Motor Efficiency, Loss Segregation & Energy Waste Calculator Works
Motor efficiency is the mechanical output divided by the electrical input. A motor delivering 22 kW at the shaft while drawing 24.2 kW is 22 ÷ 24.2 = 90.9% efficient, so 2.2 kW is lost as heat. Over 4,000 operating hours that is 8,800 kWh, which at 28 cents per kWh costs $2,464 a year. Losses are split between copper losses in the windings, iron losses in the core, friction and windage, and stray losses, as set out in IEC 60034-2-1. Higher efficiency classes (IE3, IE4) cost more but often repay the difference in a few years at high running hours. Match the motor size to the load, because lightly loaded motors run less efficiently.
- Enter Shaft Mechanical Output Power (kW) (kW): Input your target parameter value.
- Enter Electrical Input Power Drawn (kW) (kW): Input your target parameter value.
- Enter Annual Operating Hours (hrs/yr): Input your target parameter value.
- Enter Electricity Tariff (¢/kWh) (¢/kWh): Input your target parameter value.
- Apply Formula: Calculate using
Efficiency η = (P_mech ÷ P_elec) × 100 | Losses = P_elec - P_mech | Cost = Wasted kWh × ($/kWh). - Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Cite this Calculator
Are you using our calculation results for a university assignment, research paper, or academic report? Use the auto-generated citations below to accurately reference this tool in your bibliography.
MyCalculator.com.au. (2026). Electric Motor Efficiency, Loss Segregation & Energy Waste Calculator. Retrieved October 24, 2026, from https://www.mycalculator.com.au/calculators/engineering/motor-efficiency-losses
MyCalculator.com.au. (2026) 'Electric Motor Efficiency, Loss Segregation & Energy Waste Calculator'. Available at: https://www.mycalculator.com.au/calculators/engineering/motor-efficiency-losses (Accessed: 24 October 2026).
Frequently Asked Questions (FAQs)
What is the difference between IE3 and IE4 electric motors?
IE3 (Premium Efficiency) motors achieve ~92.5–94% efficiency for typical industrial sizes, while IE4 (Super-Premium) and IE5 (Ultra-Premium SynRM) reduce electrical losses by a further 15–20%, saving thousands of dollars in lifetime power bills.
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Authoritative Standards & Verified Reference Citations
Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:
Australian Standards including AS/NZS 3000 (Wiring Rules), AS 3600 (Concrete Structures), and AS 4100 (Steel Structures).
Accreditation and technical guidelines for civil, structural, mechanical, and electrical engineering.
Dedicated Australian home loans, borrowing capacity, mortgage repayments & refinance modeling.