Appliance running costs

How much electricity does a ceiling fan use?

Most residential ceiling fans draw roughly 10 W to 90 W for the fan motor, depending mainly on speed and motor type. Low speed on an efficient DC fan can be under 10 W; high speed on an older AC fan can approach 90 W. This page uses 40 W as an editable example, light kit excluded.

How many watts does a ceiling fan use?

Example: a 40 W ceiling fan used 8 hours a day uses 0.320 kWh per day, about 9.74 kWh per average month and 116.9 kWh per year. At $0.180/kWh that is $0.06 per day, $1.75 per month and $21.04 per year. The 40 W is an example, not a figure for every ceiling fan — enter your own below.

Your inputs

Ceiling fan power (your own watts)

Typical example — replace this 40 W example with your appliance’s actual rating for a better estimate.

Hours switched on per day

Duty cycle while switched on

Leave at 100% for a steady load; standby is not included unless you enter it.

Standby draw while switched off

Applies only to the 16 h a day the appliance is switched off, not to the idle part of the duty cycle.

Electricity rate

Use the total variable rate from your bill, including delivery charges per kWh.

Scenario: hours per day

$1.75

per month (30.44-day average month)

0.320 kWh per day at 40 W

Estimate using typical assumptions

Per day: $0.06
kWh / month: 10
kWh / year: 117
Per year: $21.04

Average power across 24 hours

13 W

Daily energy spread evenly over 24 hours. Includes standby draw during switched-off hours when entered.

Cost per running hour

$0.007

While the appliance is actually drawing power.

Effective duty cycle

100%

Share of switched-on time at rated power.

Method

40 W = 0.04 kW
0.04 kW × 8 h/day = 0.32 kWh/day active
0.32 kWh × 0.18 USD/kWh = 0.058 USD/day
0.058 × 30.436875 days = 1.753 USD/month
0.32 kWh × 365.2425 days = 116.878 kWh/year
116.878 kWh × 0.18 USD/kWh = 21.038 USD/year

Monthly figures use a 30.44-day average month, 365.24-day average year.

Assumptions

Electricity rate of 0.18 USD/kWh (editable).
Calculations use a year of 365.2425 days and an average month of 365.2425 ÷ 12 = 30.436875 days, so twelve average months equal one year exactly. Displayed values are rounded to 365.24 and 30.44 days, and the rounded figures do not multiply out exactly.
Rated power is treated as real power in watts, not volt-amps.

What can change the result?

Speed setting — the largest single factor
Motor type (DC motors usually draw less)
Blade size and design
Hours of use per day

$1.75/mo · 10 kWh/mo

Typical ceiling fan wattage — and what the number means

What the figure represents: Fan-motor power at a given speed, excluding any light kit.

Rated or typical power is what a label or spec sheet lists. Your watts is the value you enter in the calculator. Actual energy use (kWh) is watts × time — which is why the same ceiling fan can cost very different amounts in different homes.

Illustrative bands to orient you, not measured averages. Use your own model's figure where you can.
Type	Approximate power	Note
Low speed	about 5–20 W	Illustrative range
Medium speed	about 15–45 W	Illustrative range
High speed	about 30–90 W	Illustrative range; DC fans at the lower end

What changes how much electricity a ceiling fan uses

Speed: high speed draws several times low speed.
Motor: DC-motor fans typically draw less than AC-motor fans.
Light kit: a separate load not included here.
Hours of use per day.

A ceiling fan is a near-constant load: once it is running at a given speed it draws a steady power. Speed matters a lot — high speed can draw several times the power of low speed — and DC-motor fans generally draw less than AC-motor fans for the same airflow. A built-in light is a separate load.

Enter the watts for the speed you actually use. Fan spec sheets and ENERGY STAR listings usually give watts at low, medium and high speed. A fan cools people, not rooms, so the biggest saving is switching it off when the room is empty.

Electricity use at different usage patterns

All rows use 40 W at $0.180/kWh, with no standby added. Only the usage changes.

Generated by the same energy engine that powers the calculator above.
Hours per day	kWh per day	Per day	Per month	Per year
4 h/day	0.160 kWh	$0.03	$0.88	$10.52
8 h/day	0.320 kWh	$0.06	$1.75	$21.04
12 h/day	0.480 kWh	$0.09	$2.63	$31.56
24 h/day	0.960 kWh	$0.17	$5.26	$63.11

Electricity use across the wattage range

From 10 W to 90 W, each used 8 hours a day.

Same engine, same rate; only the wattage changes.
Power	kWh per day	Per day	Per month	Per year
10 W	0.080 kWh	$0.01	$0.44	$5.26
40 W	0.320 kWh	$0.06	$1.75	$21.04
90 W	0.720 kWh	$0.13	$3.94	$47.34

The change that matters most: switch it off in empty rooms

A fan cools people by moving air over skin; it does not lower room temperature. Turning it off when nobody is there is modelled here as 8 hours a day becoming 5.

Both rows computed by the same engine at $0.180/kWh.
Scenario	kWh per year	Cost per year
Ceiling fan example above	117	$21.04
Switch it off in empty rooms	73	$13.15 — saves $7.89/yr

Where these numbers come from

ENERGY STAR ceiling-fan specifications define power consumption as active power in watts at each speed setting, and certified listings report it — check your model's figure.
The 40 W default and speed bands are SnapEnergyLab examples, not measured averages.

Worth knowing

Light kits are not included; add the bulbs' watts separately.

Worth knowing

Remote-control receivers can draw a little standby power, not included here.

Your next decision

Other appliances

Electricity cost tools

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