Deep Freezer Electricity Cost Calculator

Estimate the daily, monthly and yearly electricity cost of a deep freezer from its wattage, duty cycle and tariff, or from measured kWh.

Your results

What this calculator does

It turns a freezer's power draw into a running cost. Enter the details above and it shows energy used (kWh) and cost per day, month and year. For the best accuracy, enter a measured kWh per day from a plug-in energy meter, because it already includes how the compressor cycles.

The inputs

• Running watts: printed on the rating label. This is the draw while the compressor runs, not the average draw.
• Hours plugged in: hours per day the freezer has power.
• Duty cycle: the share of time the compressor runs. It changes with room temperature, lid openings and how full the freezer is. The 50% default is a placeholder, not a fact about your freezer.
• Tariff: the price per kWh on your electricity bill.
• Measured kWh/day: if filled in, it replaces the watts calculation.

The formula

Daily kWh = watts × hours × duty cycle ÷ 1,000. Daily cost = daily kWh × tariff. Monthly and yearly figures multiply the daily result by the number of days.

Worked example (illustrative)

150 W × 24 h × 50% ÷ 1,000 = 1.8 kWh per day. At 100 per kWh that is 180 per day, 5,400 per month and 65,700 per year. Change any input and the picture changes.

Ways to lower the cost

• Keep the freezer in a cool, shaded spot with space around it for airflow.
• Open the lid less often and organise stock so items are quick to find.
• Clean door seals and defrost when ice builds up.

Limits

The result excludes generator fuel, inverter losses, tariff changes and voltage problems. It is an estimate, not a bill.

FAQ

Is rated wattage the same as actual use?

No. Rated watts describe the draw while the compressor is running. Over a day the average is lower, which is why duty cycle matters.

How do I measure real use?

Plug the freezer into an energy meter, leave it for at least 24 hours under normal use, and read the kWh. Enter that figure in the optional field.

Results are estimates, not professional advice. See our disclaimer. Calculator and guide by Borniventure Ugochukwu Nwakamma.

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