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Efficiency Calculator
Work out efficiency from useful output and total input, and the energy lost.
bolt Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Efficiency
Compare Your Options And Get Clear Answers
Work out efficiency from useful output and total input, and the energy lost.
Efficiency Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Efficiency = Output / Input 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
Efficiency Quick Guide
Typical values for reference.
| Output | Input | Efficiency | |
|---|---|---|---|
| 800 | 1000 | 80.0% | |
| 35 | 100 | 35.0% | |
| 90 | 100 | 90.0% | |
| 300 | 1000 | 30.0% | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Efficiency Calculator FAQ
Answers to common questions about this calculator.
Useful output divided by total input, times 100.
No for energy conversion; heat pumps use COP instead.
All energy or power supplied to the system.
It is only as accurate as your measurements.