Calculate your cost
Start with the example below, then replace the wattage, daily runtime, and rate with the numbers for your cpap machine.
This setup uses about 10 kWh in a 30-day month.
Please enter valid values within the ranges shown.
| Schedule | Hours/day | Cost/month |
|---|---|---|
| Half runtime | 4 | $0.90 |
| Page example | 8 | $1.81 |
| Longer runtime | 12 | $2.71 |
Same 40-watt input and 18.83¢/kWh rate; only runtime changes.
Formula for the page example
0.04 kW × 8 hr × $0.1883 = $0.06 per day
Convert watts to kilowatts, multiply by the active hours used each day, then multiply by the electricity price in dollars per kWh. Multiply the daily result by 30 for the monthly estimate shown above.
How to read this estimate
A CPAP machine runs all night but uses very little power. If it has a heated humidifier, the wattage increases slightly.
Use this as a baseline until you can check the label or measure the cpap machine directly. Model, settings, condition, climate, and household routine can all change the result.
What changes the cost?
- 01
Use of a heated humidifier
- 02
Tube temperature settings
- 03
Air pressure level
Ways to spend less
- Turn down the heated humidifier setting in warm weather.
- Wash the filter regularly so the motor runs smoothly.
- Unplug it during the day to avoid phantom power draw.