Electricity

How many watts does a refrigerator use?

A fridge draws its rated watts only while the compressor runs — which is roughly a third of the time. That distinction decides both your bill and your backup sizing.

Published 23 August 2026 · Published by SnapEnergyLab. Methodology and default assumptions are documented separately.

A woman standing at an open stainless steel refrigerator in a daylit home kitchen, looking at the shelves

Quick answer

A typical household refrigerator draws 100–250 watts while its compressor is running, briefly spikes to 500–1,200 watts at the moment the compressor starts, and averages 35–90 watts across a full day because the compressor is only on about a third of the time.

In energy terms that is roughly 1.0–1.8 kWh per day, or 30–55 kWh per month — about $7.60–$13.70 a month at $0.25/kWh.

Which number you need depends on the question. Sizing a battery or generator? Use the surge. Estimating a bill? Use kWh per day. Never use the running watts as if the fridge drew them continuously — that overstates consumption by roughly three times.

How to read the numbersSourced valueSite defaultCalculated resultIllustrative model

Running watts: 100 – 250 W; Sourced value
Starting surge: 500 – 1,200 W; Sourced value
Average over 24 h: 35 – 90 W; Calculated result
Typical use: 1.0 – 1.8 kWh/day; Sourced value

Four different numbers, four different questions

Most disagreement about fridge wattage is people quoting different quantities at each other. There are four, and they can differ by a factor of thirty.

The four wattage figures for a refrigerator and what each is used for
Figure	Typical value	Use it for
Starting (surge) watts	500 – 1,200 W for <1 s	Inverter and generator sizing. Nothing else.
Running watts	100 – 250 W	Continuous inverter rating, circuit checks.
Average watts (24 h)	35 – 90 W	Battery runtime and backup duration.
Nameplate watts	Often 300 – 800 W	Almost nothing. It is an electrical maximum including defrost heaters.

Why the average is a third of the running watts

A conventional refrigerator has one speed: on. It cools until the thermostat is satisfied, stops, warms slightly, and starts again. The share of time it spends running is the duty cycle, typically 30–40% for a well-sealed modern unit in a normal room.

That is why a 150 W fridge is really a 50 W fridge as far as your bill is concerned. It is also why the duty cycle — not the wattage — is the figure that changes when conditions change. A fridge in a 30 °C garage, or one opened constantly, does not draw more watts. It draws them for more hours.

average power (W) = running watts × duty cycle
daily energy (kWh) = average power (W) × 24 ÷ 1000
monthly cost = daily energy × 30.44 × price per kWh
150 W × 0.35 = 52.5 W average
52.5 × 24 ÷ 1000 = 1.26 kWh per day
1.26 × 30.44 × 0.25 = 9.59 per month

Duty cycle is the only term most people omit, and it is the one that changes the answer by a factor of three.

Refrigerator wattage by type

Ranges below describe classes of appliance, not specific models. Where your own unit sits inside the range depends on age, insulation, room temperature and how full it is kept.

Running watts, starting surge, duty cycle and daily energy by refrigerator type
Type	Running watts	Starting surge	Duty cycle	kWh / day
Mini fridge / bar fridge (40–90 L)	60 – 90 W	250 – 450 W	30 – 40%	0.5 – 0.8
Top-freezer, 250–350 L	100 – 150 W	500 – 900 W	30 – 40%	0.9 – 1.4
Bottom-freezer, 300–400 L	120 – 180 W	600 – 1,000 W	30 – 40%	1.1 – 1.6
Side-by-side, 500–650 L	150 – 250 W	800 – 1,200 W	35 – 45%	1.5 – 2.4
American / French door with ice maker	180 – 300 W	900 – 1,400 W	40 – 50%	1.8 – 3.0
Chest freezer, 200–300 L	100 – 200 W	600 – 1,100 W	25 – 35%	0.8 – 1.6
Inverter-compressor model (any size)	40 – 120 W, variable	Negligible	50 – 90% at low speed	0.6 – 1.5

Fridge and freezer bars are the midpoint running watts multiplied by the midpoint duty cycle from the table above. The router + modem figure is a typical always-on draw shown for scale, not derived from that table. These are derived figures for comparison, not measurements of a specific model.

Show the plotted values

Period	Average watts
Mini fridge	26 W
Top-freezer	44 W
Side-by-side	80 W
French door	108 W
Chest freezer	45 W
Router + modem	12 W

Worked example: a 500 L side-by-side

Running power while the compressor is on200 WIllustrative model
Duty cycle in a 21 °C kitchen0.40Site default
Average power200 × 0.40 = 80 WCalculated result
Daily energy80 × 24 ÷ 1000 = 1.92 kWhCalculated result
Monthly energy1.92 × 30.44 = 58.4 kWhCalculated result
Monthly cost at 0.25 per kWh14.61Calculated result
Annual cost175Calculated result

If you had used 200 W continuously instead$438/year — nearly 2.5× too high

Monthly and annual cost at your electricity price

Refrigerator running cost per month by daily consumption and electricity price
kWh per day	kWh per month	$0.15/kWh	$0.25/kWh	$0.35/kWh
0.8	24.4	$3.65	$6.09	$8.52
1.0	30.4	$4.57	$7.61	$10.65
1.3	39.6	$5.94	$9.89	$13.85
1.8	54.8	$8.22	$13.70	$19.18
2.4	73.1	$10.96	$18.26	$25.57

Months are taken as 30.44 days so twelve of them add up to a real year. The price column that matters is your effective rate — total bill divided by total kWh — not the headline unit rate.

Starting watts, and why backup systems fail on them

A conventional compressor is an induction motor. At the instant it starts, before the rotor is turning, it draws several times its running current for a fraction of a second. Three to six times running power is normal for a fridge compressor.

A 150 W fridge can therefore demand 900 W for half a second. An inverter or generator sized to 200 W will trip on the very first start, with the battery still full. This is the single most common reason a “fridge-sized” backup system does not run a fridge.

How to get the number for your fridge

1. Read the energy label

The annual kWh figure on the label is the most reliable starting point. Divide by 365 for kWh per day. It is produced under a standardised test, so a real kitchen usually lands 10–30% above it.

2. Use a plug-in energy monitor

The definitive method. Leave a monitor in place for at least 48 hours — anything shorter is dominated by where in the cycle you started and whether a defrost cycle happened to run.

3. Isolate it on your meter

Switch off everything else for an hour, take two meter readings, and multiply. Crude, but it captures the real appliance in the real room.

Put your own fridge through the numbers

Enter running watts, duty cycle and your electricity price to get cost per day, month and year — with the duty cycle visible and editable rather than buried in an average.

Open the refrigerator cost calculator

What actually reduces the figure

Room temperature. The compressor rejects heat to the room. Moving a fridge out of a hot garage or away from an oven can cut duty cycle by several percentage points — the largest free saving available.

Door seals. A seal that no longer grips a sheet of paper leaks cold air continuously.

Condenser coils. Dust-blanketed coils reject heat poorly and lengthen every cycle.

The second fridge. An old spare fridge in the basement running at 1.5 kWh/day costs roughly $137 a year at $0.25/kWh. It is usually the most expensive appliance nobody thinks about.

Thermostat setting. Each degree colder than needed costs continuously. 4 °C for the fridge compartment and −18 °C for the freezer are the usual targets.

Assumptions and limitations

All wattage, duty-cycle and kWh ranges describe classes of appliance and are derived from published certified consumption data. They are not measurements of your unit.
Duty cycle varies with room temperature, door openings, how full the appliance is and the condition of its seals. It is the largest source of uncertainty in every figure on this page.
Starting surge depends on compressor design and supply voltage. Size backup equipment from the manufacturer's locked-rotor figure where one is available, not from a typical range.
Automatic defrost heaters draw several hundred watts for short periods, are included in annual label figures, and are not shown separately in the running-watts column.

Sources

ENERGY STAR Product Finder — Refrigerators (annual kWh by model) — US EPA / Department of Energy
Supports: Certified annual consumption figures used to sanity-check the kWh per day ranges in the table.
10 CFR 430 Subpart B, Appendix A — Uniform test method for refrigerators and freezers — US Department of Energy
Supports: Annual energy figures on labels come from a standardised test, not from household conditions.
NEMA MG 1 — Motors and generators — National Electrical Manufacturers Association
Supports: Locked-rotor starting current of the induction motor in a conventional compressor.