Motor Efficiency Calculator
Solve η = m·g·v / (V·I) step by step — free motor efficiency calculator with worked examples, real-world defaults and instant answers.
Electric motor efficiency from mechanical output.
About Motor Efficiency Calculator
The Motor Efficiency Calculator solves η = m·g·v / (V·I) for you with the full working shown — every substitution, every unit, every step, exactly the way a good teacher writes it on the board. A hoist drawing 2.3 kW to lift 50 kg at 3 m/s runs at 64% — the gap is bearing friction, winding resistance and eddy currents, all of it heat.
How to use Motor Efficiency Calculator
- 1Enter your known values in the input fields (sensible real-world defaults are pre-filled).
- 2The tool substitutes them into η = m·g·v / (V·I) and recomputes live.
- 3Read the answer in the result box, then expand the step-by-step solution to see the full working.
- 4Copy the method into your notebook, or change inputs to explore how the result behaves.
Why use Motor Efficiency Calculator?
- ✓Solves η = m·g·v / (V·I) instantly as you type — no submit button, no waiting
- ✓Step-by-step solution shown for every calculation, not just the final answer
- ✓Realistic example values pre-loaded so you can see a worked example immediately
- ✓100% free, no sign-up, runs entirely in your browser — your numbers never leave your device
- ✓Mobile-friendly and fast enough to use mid-homework or mid-lesson
Frequently asked questions
What formula does the Motor Efficiency Calculator use?+
It uses η = m·g·v / (V·I). The steps section shows the formula with your actual numbers substituted, so you can follow (and verify) every stage of the calculation rather than trusting a black box.
What should I keep in mind when using this calculator?+
A hoist drawing 2.3 kW to lift 50 kg at 3 m/s runs at 64% — the gap is bearing friction, winding resistance and eddy currents, all of it heat. Industrial motors at rated load reach 85–96%, and because a big motor runs for years, a single efficiency point often outweighs its purchase price.
Is the Motor Efficiency Calculator free to use?+
Completely free, with no sign-up or limits. All computation happens client-side in your browser, so it is fast, private, and works even on slow connections once the page has loaded.
Can I use this for homework, teaching or exam prep?+
That is exactly what it is built for. The step-by-step working mirrors how solutions are presented in class, so you can check homework, build worked examples for teaching, or practise method recall before exams.
Embed Motor Efficiency Calculator on your website
Want Motor Efficiency Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/motor-efficiency-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Motor Efficiency Calculator — ToolJolt" loading="lazy"></iframe>Related Science tools
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