Heat Pump COP Calculator
Coefficient of performance (COP) compares useful thermal energy delivered with the electrical energy used over the same period. It is a measured-period ratio rather than a seasonal guarantee.
How to use this calculator
- Enter useful thermal energy, electrical energy and electricity price per kWh.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by heat pump cop estimator calculator
COP = useful heat output in kWh ÷ electricity input in kWh.
- COP = useful heat output in kWh ÷ electricity input in kWh.
- Performance changes with weather, temperature lift, defrosting, circulation pumps and measurement boundaries. Use matched energy readings.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
A system delivers 18 kWh of heat while using 5 kWh of electricity.
18 ÷ 5 = COP 3.6.
Measured-period COP is 3.6.
Understanding the result
Coefficient of performance (COP) compares useful thermal energy delivered with the electrical energy used over the same period. It is a measured-period ratio rather than a seasonal guarantee.
Performance changes with weather, temperature lift, defrosting, circulation pumps and measurement boundaries. Use matched energy readings.
Important notes
Performance changes with weather, temperature lift, defrosting, circulation pumps and measurement boundaries. Use matched energy readings.
Treat the result as an estimate from the entered assumptions. For commercial, statistical, engineering or health-related decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Can COP be greater than 1?
Yes. A heat pump moves thermal energy rather than converting electricity only into heat.
Is this seasonal performance factor?
Only if the inputs cover the full season and all relevant energy boundaries.
How should I interpret this result?
Performance changes with weather, temperature lift, defrosting, circulation pumps and measurement boundaries. Use matched energy readings.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.