Calculate your cost
Start with a representative input, then edit all three numbers.
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 |
| Starting point | 12 | $3.39 |
| Longer runtime | 18 | $5.08 |
Same 50-watt input and 18.83¢/kWh rate; only runtime changes.
The quick formula
0.05 kW × 12 hours × $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 uses relatively little power compared with a compressor or heating appliance, but it may operate many hours each day. Fan speed and continuous operation are the main reasons two households see different costs.
The starting values keep this page useful before you have a label or meter reading. They do not describe every model, climate, operating mode, or household.
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.