Understand your estimate
How to use this result
Estimate electricity for each air-cleaner operating mode or a representative daily measurement, then add an optional filter accrual budget. Lower watts do not establish equivalent clean-air delivery, noise or room suitability.
Method reviewed · Calculation methods · Evidence and source policy
Find the right inputs
Electricity basis
Mode W/hours or measured complete-day kWh
Use power for the actual speed or the captured automatic routine.
Performance context
CADR, pollutant, unit, speed and conditions
Maximum-speed performance is not a declaration for every low-power setting.
Filter budget
Full-set price, interval in months, calendar budget days
Calendar budget days are independent from electricity use days.
The calculation
Electricity = daily electrical kWh × use days × quantity × tariff. Filter accrual = set price × 12 ÷ interval months × calendar days ÷ 365 × quantity.
A worked arithmetic example
Illustrative arithmetic: 40 W for eight hours plus 10 W for 16 hours uses 0.48 kWh/day. One device for 365 days at $0.20/kWh costs $35.04. A $40 filter set every 12 months adds $40 annual accrual, making a $75.04 budget.
What the estimate can tell you
Accrual is not a purchase-date forecast or guaranteed filter life. Measured electricity already contains captured speed changes and idle use; keep performance and source context when comparing routines.
Questions about this calculation
Can I use the highest CADR with the lowest-watt setting?
Only if the source explicitly reports that combination. Usually each tested speed needs its own matching performance context; do not pair unrelated figures.
Why are filter calendar days separate from operating days?
A chosen electricity routine can run only on some days of a longer budget period. The entered replacement interval and calendar period define accrual; actual replacement needs depend on the product and conditions.