The 10 kWh reading is a calculation example, not a measurement taken from a refrigerator. A short observation cannot prove that an appliance is faulty or predict every season. It gives you a dated figure to compare with the annual label estimate.
Start with two different kinds of evidence
An EnergyGuide label gives a standardized annual energy estimate for a particular model. A meter observation records what happened in your home during a stated period. Keep those values separate until they use the same time basis.
Record the label's annual kWh, model number and estimated operating cost. The EnergyGuide buying guide explains how to read and reprice those fields. This guide begins after that step and asks whether a measured period provides a fair consumption comparison.
The FTC explains that an EnergyGuide operating cost (opens in a new tab) uses typical operation and a national energy-price assumption. Your local price can change the dollar result even when annual kWh does not change.
Turn a measured period into a daily average
Write down the start reading, end reading, start time and end time. Subtract the readings to obtain the kWh used during complete elapsed days.
Daily average kWh = measured kWh ÷ complete observation days.
Projected annual kWh = daily average kWh × 365.
For the hypothetical observation, 10 kWh ÷ 7 days = 1.4286 kWh per day. Extending the unrounded average across a chosen 365-day year gives 521.43 kWh. At the June 2026 U.S. residential benchmark of $0.1834/kWh, confirmed in the EIA monthly retail-sales data (opens in a new tab), the projected annual cost is $95.63.
This projection assumes every day resembles that week. It does not say that the refrigerator will use exactly 521.43 kWh over the next year.
Use a worksheet instead of comparing two dollar labels
| Record | Hypothetical observation | Your refrigerator | Why it matters |
|---|---|---|---|
| Label annual kWh | Not supplied | _____ | Provides the standardized annual comparison |
| Measured energy | 10 kWh | _____ | Records energy used during the observation |
| Complete days observed | 7 days | _____ | Defines the time basis |
| Daily average | 1.4286 kWh/day | _____ | Lets you compare periods of different lengths |
| Projected annual use | 521.43 kWh | _____ | Matches the label's annual time basis |
| Electricity rate | $0.1834/kWh | _____ | Keeps both cost calculations on one price basis |
Do not fill the missing label value with a generic refrigerator number. Use the annual kWh printed for your exact model. If you do not have the label, check the manufacturer or seller before making a label comparison.
Separate a price difference from a consumption difference
First multiply the label's annual kWh by your chosen local rate. That updates the price assumption without changing the label's energy estimate. Then compare the label annual kWh with the projected annual kWh from your observation.
If only the repriced dollar amount changes, you have shown a price difference. If the projected annual kWh also differs, you have found a consumption question to investigate. You have not diagnosed the cause. A short observation can be affected by room temperature, door openings, recently added food, defrost cycles, settings or an unusual household schedule.
Repeat the observation under ordinary conditions before drawing a strong conclusion. Keep the dates, duration, settings and any unusual events beside each result.
Check operating conditions without assigning a penalty
ENERGY STAR refrigerator guidance (opens in a new tab) recommends keeping the appliance away from heat sources, allowing air circulation and checking door seals. Compare the installation with the refrigerator's own manual before changing anything.
A warm room, damaged seal or blocked clearance can be an observation worth recording. This guide does not assign a universal percentage increase to age, temperature or door openings. If food is not staying properly chilled or the appliance behaves abnormally, contact the manufacturer or a qualified appliance technician.
Use a plug-in monitor only when its manufacturer permits the appliance and electrical load. Do not improvise adapters or open electrical equipment. Ask a licensed electrician when an electrical connection needs assessment.
Use the right calculator input
For a cumulative meter result, energy divided by elapsed hours gives an average kW; multiply by 1,000 for average watts. Enter that average in the appliance running-cost calculator, use the complete daily period and keep duty cycle at 100%. The average already includes cycling observed during the measurement.
Do not paste annual kWh into a watts field or multiply it by hours again. Use the label's annual-kWh formula directly when you only need to reprice the label.
Read the appliance measurement guide for meter evidence and the electricity-rate guide for tariff inputs. Fixed account charges, demand charges and detailed time-of-use prices remain outside this comparison.