Air Purifier Electricity Cost Calculator: 24-Hour Use
See the cost of continuous use, then replace the example with your chosen fan setting.
Your usage
Example inputsResults update as you type. All costs are in U.S. dollars. See result ↓
For your own rate, add per-kWh supply and delivery charges; leave out fixed fees. Find it on your bill →
Example result — edit inputs to match your use
Estimated electricity cost28.8 kWh per month at 18.31¢/kWh
(40 W ÷ 1,000) × 24 h × 30 days × 100% × $0.1831 = $5.27At these watts and active time: $0.01 per scheduled hour.
Daily is one day of use. Annual repeats your monthly schedule 12 times (not a 365-day forecast). Rates are held constant. Actual use may vary.
↑ Edit inputsMeasure the fan setting you actually use
At an illustrative 40 W continuously, an air purifier uses 0.96 kWh per day. Over 30 days at 20¢/kWh that costs $5.76. This is a worked scenario, not a typical value for every purifier or an estimate of filtration performance.
Account for automatic mode
Auto mode may change fan speed during the day. A measured average over a representative period is more useful than the maximum nameplate draw. Set active time to 100% when entering that average so you do not reduce it a second time.
Reference: Virginia Cooperative Extension: estimating appliance energy use
Does a lower wattage mean a better air purifier?
Electricity cost alone does not compare clean-air delivery, room coverage, noise, or filter costs. Compare devices suitable for the same room and use case; this calculator does not assess health outcomes.
Make the estimate yours
Replace the example values with measurements or the product label. Select your state for an official average, then override it with your bill’s variable rate when available.
Read the calculations and assumptionsAir purifier cost at different electricity rates
This static worked example uses 40 W × 24 hours/day × 30 days × 100% active time. These chosen rates show price sensitivity; they are not utility offers. The interactive result above uses your edited inputs.
| Electricity price | Monthly cost | Annual cost* |
|---|---|---|
| 12¢/kWh | $3.46 | $41.47 |
| 20¢/kWh | $5.76 | $69.12 |
| 30¢/kWh | $8.64 | $103.68 |
*Annual cost repeats this monthly pattern 12 times. Use your actual season length for seasonal equipment. Values are rounded only for display.
Practical energy guides
Watts to kWh: Calculate Energy Use and Electricity Cost
Convert watts, kilowatts, and minutes into kWh with worked examples. Learn why a wattage alone cannot tell you monthly electricity use.
Understand your billHow to Find Your Electricity Rate on Your Bill
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