Calculate your cost
Start with the example below, then replace the wattage, daily runtime, and rate with the numbers for your air purifier.
This setup uses about 18 kWh in a 30-day month.
Please enter valid values within the ranges shown.
| Schedule | Hours/day | Cost/month |
|---|---|---|
| Half runtime | 6 | $1.69 |
| Page example | 12 | $3.39 |
| Longer runtime | 18 | $5.08 |
Same 50-watt input and 18.83¢/kWh rate; only runtime changes.
Formula for the page example
0.05 kW × 12 hr × $0.1883 = $0.11 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
An air purifier draws much less power than most heating or compressor-driven equipment. Because people often leave it on for hours, fan speed and daily runtime are the inputs that matter most.
Use this as a baseline until you can check the label or measure the air purifier directly. Model, settings, condition, climate, and household routine can all change the result.
What changes the cost?
- 01
Fan speed and hours of operation
- 02
Motor efficiency and purifier size
- 03
Filter loading, room volume, and automatic sensor behavior
Ways to spend less
- Use automatic mode when air quality is consistently good.
- Choose a purifier sized for the room rather than an oversized unit.
- Replace or clean filters on schedule so the fan is not restricted.