Is a CPAP machine expensive to run?

The heated humidifier is most of the draw; the blower alone uses about a third as much. At typical use it adds about $1.60 to a monthly electric bill at the US-average rate, but that swings from $1.12 in the cheapest states to $4.17 in the most expensive.

How many watts does a CPAP machine use?

CPAP Machine typically draws about 40 running watts. It's a resistive load, so its startup and running wattage are the same. Check the nameplate or label on your specific unit for its exact rating.

How much electricity (kWh) does a CPAP machine use?

At typical use (40 W for 8 hours a day), a CPAP machine uses about 0.3 kWh per day — roughly 10 kWh per month, or about 1% of what the average US home uses in a month (863 kWh). Energy used doesn't depend on your electricity rate — only the bill does.

How can I lower the cost of running a CPAP machine?

The heated humidifier is most of the draw; the blower alone uses about a third as much. You can also cut the cost by lowering your electricity rate — many utilities offer cheaper off-peak hours — or simply by running it fewer hours. The calculator on this page shows how changing hours per day or your electricity rate moves the number.

How Much Does It Cost to Run a CPAP Machine?

A CPAP draws about 40 watts with the humidifier running — a full year of nightly therapy costs only a few dollars. At the US-average rate of 16.5¢/kWh, running a CPAP machine costs about $1.60/month ($19.25/year) at typical use. Adjust the watts, hours, and your rate below for your exact number.

Power (watts)

Hours per day: 8

Days per week: 7

Your state (sets the rate)

Electricity rate ($/kWh)

Cost to run a CPAP machine

$19/yr

Per day: $0.05
Per month: $1.60
Energy per year: 117 kWh

Cost = power (kW) × hours × days × your rate. Defaults are typical values — enter your appliance's actual watts (often on a label) and your real rate for a precise figure.

How much electricity does a CPAP machine use?

At 40 W for 8 hours a day, a CPAP machine uses about 0.3 kWh per day — roughly 10 kWh per month and 117 kWh per year. That's about 1% of the 863 kWh the average US home uses in a month. Energy use is the same everywhere — only the price per kWh changes your bill.

Wondering about the circuit instead? See how many amps a CPAP machine draws.

Cost to run a CPAP machine by electricity rate

Same 40 W appliance, 8 h/day — the bill changes with where you live.

Scenario	Rate	Per month	Per year
Cheapest states (North Dakota)	11.5¢	$1.12	$13.44
US average	16.5¢	$1.60	$19.25
Most expensive (Hawaii)	42.9¢	$4.17	$50.06

Find your state's rate on the electricity rates by state page, or see the appliance wattage chart for more devices.

Frequently asked questions

At the US-average residential rate of 16.5¢/kWh, a CPAP machine drawing 40 watts for about 8 hours a day costs roughly $0.05 per day, $1.60 per month, and $19.25 per year. Your actual cost depends on your electricity rate and how much you use it, and the calculator on this page adjusts for both.

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How Much Does It Cost to Run a CPAP Machine?

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Cost to run a CPAP machine by electricity rate

Frequently asked questions