Refrigerator Electricity Cost Calculator
Enter your appliance data and electricity tariff to calculate energy use and cost. Example inputs are editable.
Enter your values and select Calculate.
Uses annual label energy divided by 365. Actual use depends on conditions. Average watts cannot size a generator or inverter. Energy charges only; fixed fees and taxes are excluded unless included in your rate. Use one currency consistently. Decimal point or comma accepted; no thousands separators.
Calculation formula
Daily energy = annual kWh / 365. Average watts = annual kWh × 1000 / 8760. Period energy = daily energy × days. Period cost = period energy × price per kWh.
A refrigerator does not draw one fixed wattage all day. Its running input, short starting demand and average energy use answer different questions. For a bill estimate, start with measured kWh or the model's annual energy figure; for backup power, check the actual running and starting requirements.
Calculate your electricity cost with your own watts, hours and tariff.
Read the three numbers separately
The appliance label describes electrical ratings, while an EnergyGuide figure describes annual energy under a test procedure. A compressor can switch or vary its output; fans, controls and defrost operation can add consumption. Dividing annual kWh by 8,760 hours gives average kW, not the power needed to start the compressor. Do not size an inverter using that average alone.
A 500 kWh/year label does not mean a 57 W starting load
For an illustrative label of 500 kWh/year, average daily energy is 500 ÷ 365 = 1.370 kWh. The average power is 500,000 ÷ 8,760 = 57.1 W. At an assumed $0.20/kWh, the annual energy charge is $100. These calculations describe energy averaged over time; they do not establish running watts or starting surge.
Six examples of power, time and electricity cost
Hypothetical constant running inputs and accumulated running hours in one day. Off-cycle use and defrost energy are excluded from these simplified rows. The $0.20/kWh tariff is illustrative, not a quoted local rate. Calculations use unrounded inputs; displayed results are rounded.
| Input power | Operating time | Energy | Cost at $0.20/kWh |
|---|---|---|---|
| 100 W | 8 hours | 0.800 kWh | $0.160 |
| 150 W | 8 hours | 1.200 kWh | $0.240 |
| 150 W | 12 hours | 1.800 kWh | $0.360 |
| 200 W | 6 hours | 1.200 kWh | $0.240 |
| 200 W | 10 hours | 2.000 kWh | $0.400 |
| 250 W | 8 hours | 2.000 kWh | $0.400 |
Energy (kWh) = average electrical input watts × hours ÷ 1,000. Multiply energy by the actual price per kWh for the energy charge. Include other billing components separately. The watts to kWh calculator handles another duration.
Measure a full operating pattern
Use a compatible energy meter rated for the appliance and follow its instructions. Record kWh over several representative days, together with room conditions and unusual door openings. A momentary reading can miss cycling or defrost. If you already have a measured daily kWh total, do not apply an additional duty-cycle factor to it. A small fridge is not automatically lower-energy than every full-size model; compare actual specifications.
Use the right inputs in the electricity-cost calculator
Enter one device or add it to a household inventory. When watts already represent the average over your entered hours, use a 100% duty factor. When watts represent an on-state value, use accumulated on-time or an appropriate duty factor, but do not apply both reductions. Keep product ratings, measured results and assumptions distinguishable in your comparison.
Frequently asked questions
Can I multiply the label watts by 24?
Only as a constant-load assumption. It can overstate a cycling refrigerator's energy and does not replace measurement.
Does a battery's Wh rating tell me whether it will start the fridge?
No. Available energy and inverter output capability are separate checks; starting behavior must also be supported.
How do I compare two annual energy labels?
Use the same units and comparable test basis. A difference of 150 kWh/year is $30/year at an illustrative $0.20/kWh.
Technical source
ENERGY STAR identifies compressor design, insulation and defrost controls as contributors to refrigerator efficiency, and provides a model comparison tool. This calculator's worked scenarios are calculations, not measurements performed on products.
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