$0.91 a Month: How Much Does It Cost to Run a CPAP Machine?

22 W (7–34 W)Typical power draw

8 h/day, 30.4 days/monthAssumed use

0.18 kWhEnergy per day

Updated September 2026 · Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

On this page: Calculator Table How we calculated Sources

Power draw (watts) — typical for cpap machine: 7–34 W; check your label Hours per day for a CPAP machine — effective run-hours Days per month — 30 = every day Months used per year — 12 for cpap machine; seasonal loads do not run all year Quick-fill your state's EIA average rate Your rate (¢/kWh) — 17¢ = EIA 2025 annual US average (July 2026 monthly: 18.31¢)

Energy used: — per day

Cost per hour: —

Cost per day: —

Cost per month in use: —

Cost per year: —

a CPAP machine: energy cost only (22 W ÷ 1,000 × hours × rate); fixed fees and taxes extra.

What changes if… Electricity rates move Compare it with charging an EV at home

Slider nudges the rate for a CPAP machine; the URL keeps it.

## How much does it cost to run a CPAP machine?

The same a CPAP machine at 8 hours a day costs $0.64 a month at 12¢ and $2.41 at 45¢ — usage held constant, only the rate moving:

Table 1: $0.91 a Month: How Much Does It Cost to Run a CPAP Machine?
Electricity rate	Per hour	Per day	Per month	Per year
12¢/kWh	$0.003	$0.02	$0.64	$8
15¢/kWh	$0.003	$0.03	$0.80	$10
17¢/kWh (US avg)	$0.004	$0.03	$0.91	$11
20¢/kWh	$0.004	$0.04	$1.07	$13
25¢/kWh	$0.005	$0.04	$1.34	$16
30¢/kWh	$0.007	$0.05	$1.61	$19
35¢/kWh	$0.008	$0.06	$1.87	$22
45¢/kWh	$0.010	$0.08	$2.41	$29

Typical power draw: 22 W (7–34 W)
Assumed use: 8 h/day, 30.4 days/month
Energy per day: 0.18 kWh
Cost per day: $0.03
Cost per month: $0.91
Cost per year: $11

Why this number

Running a CPAP machine at 22 watts for 8 hours a day costs about $0.03 a day and $0.91 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $11 a year. The formula for a CPAP machine: 22 W ÷ 1,000 × hours × your rate per kWh. For a CPAP machine your own rate changes the answer: at 12¢/kWh that month costs $0.64, at 45¢/kWh it costs $2.41.

A CPAP machine rated at 22 watts, run 8 hours a day, costs about $0.03 a day — about $0.91 a month, or $11 a year — at the US average electricity rate of 17¢/kWh. That places it 38th of the 40 appliances tracked here, near the bottom. It is not where a high bill comes from, and switching it off will not rescue one.

What actually drives this number

The wattage here is not a guess: ResMed’s own measured power table for the AirSense 10 puts the device at 7 W alone, 22 W with the heated humidifier, and 34 W with a heated tube as well, and ResMed’s battery guide sizes everything around 8 hours a night. That is the assumption used here: 8 hours every night, humidifier on. The spread matters more than the average — humidifier off is about 20 kWh a year, humidifier on about 64, heated tube on top nearer 99. Either way this is one of the cheapest essential appliances in the house: medical equipment is not where an electric bill comes from.

For a CPAP machine the unit that matters is the kilowatt-hour, not the kilowatt : 22 W is only the rate of use, and 8 hours a day is what turns it into the 64 kWh a year you are actually billed for. On that yearly measure its nearest always-on neighbor is the washing machine at about 62 kWh.

Where this number comes from

Benchmark: 64 kWh/year — ResMed’s measured power table — details in the note above
Assumed use for a CPAP machine: 8 h/day, 30.4 days/month, 12 months/year — every one of these is editable in the calculator above
Rate for a CPAP machine: 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), from EIA Electric Power Monthly, Table 5.6.A ; the state selector above fills in yours

Putting CPAP machine in proportion

At 17¢/kWh, a CPAP machine next to the rest of the bill:

CPAP machine at $0.91 a month is close to Washing machine at $0.88, and about 2x less than Ceiling fan ($1.84)
One hour of a CPAP machine uses as much as roughly an hour of a typical always-on device
Over a year a CPAP machine comes to $11 — about 0.1 months of a $150 monthly electricity bill

For a CPAP machine: consumer electronics look power-hungry on the label and rarely are on the bill, because they run for hours rather than around the clock and spend much of that time well below their rated draw. On this site’s own numbers, a CPAP machine lands at #38 of 40 on the monthly-cost ranking, at about $0.91 for a typical month.

The formula, in full

The 22 W arithmetic for a CPAP machine, step by step:

Watts to kilowatts. 22 W ÷ 1,000 = 0.02 kW.
Energy per day. 0.02 kW × 8 hours = 0.18 kWh.
Cost per day. 0.18 kWh × $0.17 = $0.03.
Cost per month. $0.03 × 30.4 days = $0.91.

For a CPAP machine the two levers are run-hours (8 h/day here) and your rate; at 8 hours a day, 22 W adds up — which is why consumer electronics dominate the rankings.

Other electronics: 65-inch LED TV ($31/yr), NAS (home server) ($53/yr), Treadmill ($62/yr). Closest on annual cost: Ceiling fan ($11/yr), Washing machine ($11/yr). Across all other electronics here, the priciest is Gaming PC at $16.32/mo.

The a CPAP machine table above runs a fixed rate ladder (12–45¢); the state quick-fill uses July 2026 averages from EIA Electric Power Monthly, Table 5.6.A .

Put a CPAP machine ($0.91 a month) against everything else in the electricity cost calculator , check your state’s rate , or browse all 40 appliances ; year-round high bills: solar savings calculator .

Frequently asked questions

How much does it cost to run a CPAP machine per hour?

About $0.004 an hour for a CPAP machine at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), for a 22 W unit. The calculation is 22 ÷ 1,000 × 1 hour × $0.17 per kWh. At 30¢/kWh the same hour costs $0.007.

How much does a CPAP machine add to my monthly bill?

Roughly $0.91 a month for a CPAP machine at 8 hours a day, 30.4 days a month, 17¢/kWh. That is about $11 a year if you use it that much year-round. For a CPAP machine, change the 8-hour default to your own use — run-time moves the total as much as the 22 W does.

How many watts does a CPAP machine use?

Typically around 22 W, with real units ranging from about 7 to 34 W depending on size, model and setting. The nameplate on your own unit is the figure to trust — these are typical values for planning, not a measurement of your appliance.

Why is my actual bill higher than the a CPAP machine figure?

$0.91 a month is the energy cost of a CPAP machine alone; your bill adds fixed connection charges, delivery fees, taxes and every other load. Add the other appliances in the index to a CPAP machine for the controllable part of the bill.

How we calculated this

Worked for a CPAP machine: 22 W ÷ 1,000 × 8 h × $0.17 = $0.03 a day; × 30.4 days = $0.91 a month; × 12 months in use = $11 a year. 22 W and 8 h are the typical figures cited for a CPAP machine; 17¢ is EIA’s 2025 annual US average.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

Where to go next

Cost to run washing machine — The next cheaper item on the list: $0.88 a month against a CPAP machine’s $0.91.
Cost to run ceiling fan — The next pricier item: $1.84 a month, which puts a CPAP machine in proportion.
All 40 appliances ranked by monthly cost — CPAP machine is 38 of 40; the full ranking at 17¢/kWh.
Electricity cost calculator — Any wattage and hours, not just a CPAP machine — with the state quick-fill.
Find your electricity rate by ZIP — Your own utility’s average rate, sent straight into the a CPAP machine calculator.