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Transformer Efficiency Calculator
Calculate transformer efficiency from output power and core and copper losses.
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Efficiency
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Calculate transformer efficiency from output power and core and copper losses.
Transformer Efficiency Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Efficiency = output / (output + core loss + copper loss) x 100.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Transformer Quick Guide
Typical values for reference.
| Output kW | Core | Copper | Efficiency |
|---|---|---|---|
| 20 | 0.8 | 1.5 | 89.69% |
| 90 | 0.8 | 1.5 | 97.51% |
| 250 | 0.8 | 1.5 | 99.09% |
| 500 | 0.8 | 1.5 | 99.54% |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Transformer Efficiency Calculator FAQ
Answers to common questions about this calculator.
Large units reach 98 to 99.5 percent efficiency.
Hysteresis and eddy-current losses that occur whenever the unit is energised.
I2R losses in the windings, rising with load.
When copper loss equals core loss.