Deep Freezer Wattage and Electricity Consumption Calculator

Turn a deep freezer's rated watts and compressor running hours into daily and monthly kWh and naira cost, or use a measured kWh figure instead.

Your results

The problem this solves

You may know your freezer's wattage but not what it uses in a day or costs in a month. This calculator turns watts and running hours into kWh and naira.

How to use it

• Rated running power: the watts on the rating label, for one freezer.
• Compressor running hours: the hours per day the compressor really runs. This is not the same as hours plugged in, so do not enter 24 unless it truly runs all day.
• Number of freezers and operating days: these scale the result.
• Tariff: the naira per kWh from your own receipt.
• Measured daily kWh (optional): from a plug-in energy meter, per freezer. If you fill it in, it replaces the estimate.

The formulas

• Daily energy per freezer = watts × running hours ÷ 1,000
• Monthly energy = daily energy × freezers × operating days
• Monthly cost = monthly kWh × tariff

Worked example (illustrative)

A 150 W freezer with the compressor running 12 hours a day uses 1.8 kWh a day. Over 30 days that is 54 kWh. At ₦150 per kWh the cost is ₦8,100 a month.

The average draw is about 75 watts, half the label figure, because the compressor rests between cycles.

Rated watts versus real use

The label shows power while the compressor runs. A freezer does not draw that all day.

Compressor cycling, room heat, lid openings and frost all change the real figure. A measured kWh reading beats an estimate every time.

Limits

The result leaves out generator fuel, inverter losses and tariff changes. It is an estimate, not a bill.

Related

• Freezer Power Rating calculator explains the figures on the label.
• Deep Freezer Electricity Cost calculator uses a duty-cycle percentage instead of running hours.
• How much does it cost to run a deep freezer? walks through the method step by step.

FAQ

How many hours does a freezer compressor run?

It varies with room heat, lid openings and frost. The only reliable way to know is to measure kWh with an energy meter.

Why not just multiply watts by 24 hours?

That assumes the compressor never stops. It usually overstates the energy a freezer uses.

Which tariff should I use?

Divide the naira on your last token receipt by the units you received. That gives your real cost per unit.

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

More calculators