Which efficiency metrics does this converter support?

It converts between COP, EER, and SEER.

What is the default SEER-to-EER factor?

The default seasonal factor α is 0.875.

Can I change the seasonal factor?

Yes. You can set α between 0.8 and 0.91.

What formula converts EER to COP?

COP is calculated as EER divided by 3.412.

How many decimal places can the result use?

You can choose from 0 to 8 decimal places.

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EER ↔ SEER ↔ COP Converter (Refrigeration Efficiency)

Convert between the three common refrigeration efficiency metrics: COP (dimensionless, W/W), EER (Btu/(W·h)), and SEER (seasonal Btu/(W·h)). Standard relations: COP = EER / 3.412, EER = COP × 3.412, SEER = EER / α (α seasonal weighting factor, default 0.875, adjustable 0.8–0.91 to match regional standards such as ARI 210/240). Enter any one metric and all three are reported.

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2 examples

From EER=10.5 -> COP≈3.0774, SEER≈12 (α=0.875)

EER=10.5. COP=EER/3.412=10.5/3.412≈3.0774. SEER=EER/α=10.5/0.875≈12 (per code).

{"result":"Efficiency conversion (from EER=10.5). COP=3.0774, EER=10.5 Btu/(W·h), SEER=12 (α=0.875).","metadata":{"input":{"fromMetric":"EER","value":10.5,"seerEerFactor":0.875},"result":{"inputMetric":"EER","inputValue":10.5,"COP":3.0774,"EER":10.5,"SEER":12,"seerEerFactor":0.875}}}

From SEER=18 -> EER≈15.75, COP≈4.6161 (α=0.875)

SEER=18. EER=SEER·α=18·0.875=15.75. COP=EER/3.412=15.75/3.412≈4.6161 (per code).

{"result":"Efficiency conversion (from SEER=18). COP=4.6161, EER=15.75 Btu/(W·h), SEER=18 (α=0.875).","metadata":{"input":{"fromMetric":"SEER","value":18,"seerEerFactor":0.875},"result":{"inputMetric":"SEER","inputValue":18,"COP":4.6161,"EER":15.75,"SEER":18,"seerEerFactor":0.875}}}

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4 options

SettingsAdjust formats, ranges, numbers, and modes.4

Input MetricselectOptionalWhich metric the Input Value represents. The other two are computed from it.Input ValuenumberRequiredValue of the selected Input Metric.SEER↔EER Factor αnumberOptionalSeasonal weighting factor α relating SEER and EER (SEER = EER/α). Default 0.875 (common US approximation). Adjust to match regional standards (0.8–0.91).Decimal PlacesnumberOptional

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EER ↔ SEER ↔ COP Converter (Refrigeration Efficiency)

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Examples

1. Convert an EER rating to COP and SEER

2. Convert a seasonal rating to EER and COP

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