The best starting number
Use the refrigerator's annual kWh estimate when it is available. Divide annual kWh by 12 for an average month, then multiply by your local electricity price in dollars per kWh.
This approach is usually better than multiplying compressor watts by 24 hours because the compressor cycles off after the cabinet reaches temperature.
Estimate from watts when the label is missing
If you only know running watts, estimate how many equivalent full-power hours the compressor runs per day. For example, 150 watts for eight equivalent hours is 1.2 kWh per day, before any separate defrost or ice-making load is considered.
Measure a cycling appliance correctly
A short meter reading may capture only a compressor-on or idle period. Measure at least a full day, preferably several typical days, to include door openings and defrost cycles.
- Record kWh, not only the highest instantaneous watts.
- Avoid testing immediately after loading warm groceries unless that is typical.
- Repeat the measurement in hot weather if the kitchen temperature changes substantially.
Reasons use may be higher than expected
A damaged gasket, blocked ventilation, dusty accessible coils, frequent door openings, or a very cold setting can lengthen compressor runtime. An older second refrigerator in a hot garage may therefore cost much more than a newer kitchen model with the same basic capacity.
Rate source and limits
The default rate is the EIA U.S. residential average for April 2026, retrieved July 16, 2026. It is an average revenue per kilowatt-hour, not a quote for your utility plan. Fixed fees, taxes, tiers, and time-of-use prices can change the bill.
Open the EIA source