Furnace Filter Calculator
Determine the optimal furnace filter change frequency based on filter type, pets, household size, allergies, and dust levels.
Inputs
Results
Change Every
73 days
Changes Per Year5
Annual Filter Cost$60
Recommended MERV Rating8
How to Use This Calculator
- Select Filter Type (fiberglass, pleated, HEPA, electrostatic) based on your HVAC system's compatibility.
- Enter Number of Pets and Number of Occupants — pets and larger households accelerate filter loading.
- Toggle Allergy Sufferers and set Dust Level to adjust the change interval for your indoor air quality needs.
- Review Change Days — the recommended days between filter replacements for your specific conditions.
- Check MERV Rating to ensure the recommended filter captures the particle sizes relevant to your health concerns.
- Use Annual Cost to compare filter types on a per-year basis and decide on the best filtration level for your budget.
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