About the HVAC Efficiency Calculator
Convert between SEER, EER and COP, and compare the running cost of two units.
Also known as: seer to cop, eer calculator, cop calculator, air conditioner efficiency, heat pump cop.
How to use this calculator
- Enter i know the, rating, cooling or heating capacity, hours per year and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
COP = EER ÷ 3.412 · SEER ≈ EER ÷ 0.875
Worked example
Using the values pre-filled in the calculator above:
- I know the: SEER
- Rating = 16
- Cooling or heating capacity = 12,000 BTU/h
- Hours per year = 1,000
- Electricity rate per kWh = 0.25
the calculator returns:
- COP: 4.103
- EER: 14
- SEER (approx): 16
- Power draw: 0.857 kW