SnapEnergyLab

Appliance running costs

How many watts does a mini fridge use?

A compressor mini fridge typically draws about 50–120 W while its compressor runs, but it only runs part of the time. Across 1,870 ENERGY STAR certified compact models, the median rated use is 244 kWh a year (middle 80%: about 195–330 kWh). This page uses 245 kWh/year as an editable example.

How many watts does a mini fridge use?

Example: a mini fridge rated at 245 kWh a year uses about 0.671 kWh per day and 20.4 kWh per average month. At $0.180/kWh that is $3.68 per month and $44.10 per year. Its compressor may draw around 85 W while running, but it runs only part of the time — so the yearly rating, not watts × 24 hours, sets the cost.

From the yellow EnergyGuide label or the model's ENERGY STAR listing. Already includes cycling.

$44.10

per year

245.0 kWh per year · $3.68 per average month

Calculated from your inputs
kWh per day
0.671 kWh
kWh per month
20.4 kWh
kWh per year
245.0 kWh
Cost per month
$3.68

Method

  1. kWh per year = rated yearly kWh
  2. kWh per day = kWh per year ÷ 365.24
  3. kWh per month = kWh per year ÷ 12
  4. cost = kWh × rate

Assumptions

  • Rated yearly kWh comes from a standard federal test and already includes compressor cycling.
  • Average month 30.44 days; average year 365.24 days.
  • In watts mode the running share is your estimate; the rated yearly kWh is more reliable.

What can change the result?

  • Yearly kWh rating of your model (EnergyGuide or ENERGY STAR listing)
  • Room temperature — a hot garage or dorm room makes the compressor run more
  • Door openings and thermostat setting
  • Freezer compartment and defrost type

Mini fridge watts — and why they are not the whole answer

What the figures represent: Running watts are what the compressor draws while it is on. Yearly kWh (EnergyGuide or ENERGY STAR) is the measured energy over a standard year including cycling — that is the figure that sets your cost.

A mini fridge is plugged in all day, but its compressor is not running all day. It cycles: it runs until the cabinet is cold, switches off, and restarts as heat leaks back in. So the running watts on the label or a plug-in meter — typically somewhere around 50–120 W — are only drawn for part of each hour. Multiplying running watts by 24 hours overstates real use by roughly two to three times.

The most honest figure is the model's yearly kWh from its yellow EnergyGuide label or its ENERGY STAR listing — that number already includes cycling under the federal test. If you only know the running watts, the calculator's watts mode multiplies them by the share of time the compressor actually runs.

Each row is labelled with what it is: certified-model data, a regulatory threshold or an illustrative range.
TypeFigureBasis
Under 2 ft³ certified compactsmedian about 208 kWh/yrENERGY STAR certified models, accessed 3 Oct 2026
3–4 ft³ certified compactsmedian about 227 kWh/yrENERGY STAR certified models, accessed 3 Oct 2026
4–5 ft³ certified compactsmedian about 268 kWh/yrENERGY STAR certified models, accessed 3 Oct 2026
Running watts while compressor is onabout 50–120 WIllustrative range; check your label or a plug-in meter

Electricity use across typical ratings

Rows use the certified-model 10th percentile, the default example and the 90th percentile, at $0.180/kWh. The last row shows the common mistake of multiplying running watts by 24 hours.

Calculated with the same formulas as the calculator above.
Yearly ratingkWh per daykWh per monthCost per monthCost per year
195 kWh/yr0.534 kWh16.3 kWh$2.93$35.10
245 kWh/yr0.671 kWh20.4 kWh$3.68$44.10
330 kWh/yr0.904 kWh27.5 kWh$4.95$59.40
Wrong: 85 W × 24 h2.04 kWh62.1 kWh$11.18$134.12

What changes how much electricity a mini fridge uses

  • Rated yearly kWh — differs by size, freezer compartment and defrost type.
  • Room temperature and ventilation around the unit.
  • Door openings and thermostat setting.
  • Compressor vs thermoelectric design.

Where these numbers come from

  • ENERGY STAR certified compact refrigerators (< 7.75 ft³) report annual energy use per model under the DOE test procedure; we summarised all 1,870 compact listings on 3 Oct 2026.
  • Certified models are at least 10% below the federal standard, so non-certified and older units can use more than these figures.
  • The 245 kWh/year default and 85 W running watts are SnapEnergyLab examples, not measured averages for every mini fridge.
Every default and range on this page, with what it represents and when the source was checked.
ValueWhat it measuresKindSourceChecked
244 kWh/yr median; 195 (10th pct) – 330 (90th pct) kWh/yrRated annual energy use, compact refrigerators and refrigerator-freezers < 7.75 ft³ (1,870 models)Certified-model dataENERGY STAR certified residential refrigerators dataset2026-10-03
≥ 10% below the federal minimum standardENERGY STAR criterion for compact refrigerators (effective 5 Aug 2021)Regulatory thresholdENERGY STAR Refrigerators & Freezers Key Product Criteria2026-10-03
245 kWh/yr; 85 W runningCalculator defaultSite exampleSnapEnergyLab, chosen near the certified-model median2026-10-03

Worth knowing

Label kWh figures come from a standardised federal test; a fridge in a hot room or opened often will use more.

Worth knowing

Thermoelectric (Peltier) coolers and wine coolers behave differently from compressor mini fridges and are not covered by these figures.

Your next decision

Other appliances

Electricity cost tools

Defaults come from the published default registry and the formulas are documented in the methodology.