COP, EER and kW/ton Efficiency Converter

COP is dimensionless, EER is BTU/h per watt, and kW/ton is common for chillers. They describe the same steady-state efficiency.

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Formula

EER = COP × 3.412
kW/ton = 12 ÷ EER

Example calculation

EER 12 = COP 3.52 = 1.0 kW/ton.

Practical HVAC use

Compare equipment rated in different systems.

Common mistakes

Converting SEER directly to COP — SEER is seasonal.

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Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators