Free Engineering Tool
Motor Efficiency Calculator
Compare IE1–IE4 motor efficiency classes per IEC 60034-30-1:2014, plus indicative IE5 (Ultra Premium). Calculate annual energy cost and savings from upgrading to a higher efficiency class.
Results
Energy Consumption Formula
IE Class Minimum Efficiencies (4-pole, 50 Hz)
| Power (kW) | IE1 (%) | IE2 (%) | IE3 (%) | IE4 (%) |
|---|---|---|---|---|
| 0.75 | 72.1 | 79.6 | 82.5 | 85.7 |
| 1.5 | 77.2 | 82.8 | 85.3 | 88.2 |
| 3 | 81.5 | 85.5 | 87.7 | 90.4 |
| 7.5 | 86.0 | 88.7 | 90.4 | 92.6 |
| 11 | 87.6 | 89.8 | 91.4 | 93.3 |
| 22 | 89.9 | 91.6 | 93.0 | 94.5 |
| 55 | 92.1 | 93.5 | 94.6 | 95.7 |
| 110 | 93.3 | 94.5 | 95.4 | 96.3 |
| 200 | 94.0 | 95.1 | 96.0 | 96.7 |
Source: IEC 60034-30-1:2014 (Tables 3, 5, 7, 9), nominal efficiency limits for 4-pole, 50 Hz motors. IE class limits vary by pole count, frequency and rated power — do not apply this 4-pole table to 2-pole or 6-pole motors (the calculator uses separate data sets for each pole count). Limits are defined from 0.12 kW to 1000 kW; ratings above 200 kW use the 200 kW limit, and ratings below 0.75 kW have lower limits than shown here.
About IE5: IEC 60034-30-1:2014 defines only IE1–IE4 for line-operated motors; IE5 (Ultra Premium) appears there only informatively (Annex A) with a target of approximately 20 % lower losses than IE4. Normative IE5 limits were introduced later in IEC 60034-30-1:2025. The IE5 figures used by this calculator are indicative values derived from the 20 %-lower-losses target — consult IEC 60034-30-1:2025 (or IEC TS 60034-30-2 for converter-fed motors) for exact IE5 limits.
Professional vibration analysis for motor diagnostics. Detect bearing faults, unbalance, and misalignment early.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
