Air Filter Replacement Calculator
Calculate when to replace your HVAC air filter and estimate annual filter costs based on home size and filter type.
Replace Every
77 days
Replace Every vs Rated Filter Life
HVAC Air Filter Replacement
Air filters trap dust, pollen, and pet dander. Replacing them on time maintains air quality and HVAC efficiency.
Adjusted Replacement Interval
Adjusted Life = Rated Life x (1 - Pet Factor - Allergy Factor)
Each pet reduces filter life by about 15%, and allergy concerns warrant replacing 20% sooner. A clogged filter reduces airflow, increases energy costs by 5-15%, and can damage the HVAC system.
Example Calculation
A 90-day rated filter in a home with 1 pet and no allergies, costing $15 each.
- 01Adjusted life = 90 x (1 - 0.15 - 0) = 90 x 0.85 = 76.5 days
- 02Rounded = 77 days
- 03Filters per year = ceil(365 / 76.5) = 5 filters
- 04Annual cost = 5 x $15 = $75
Frequently Asked Questions
Learn More
How to Calculate a Tip - Complete Tipping Guide
Learn how to calculate a tip at restaurants, salons, and other services. Covers standard percentages, mental math shortcuts, and how to split the bill fairly.