Filter cost of ownership
Use the manufacturer's stated filter life to set replacements per year (e.g. a 12-month filter = 1/yr; a 6-month carbon filter = 2/yr). Washable pre-filters don't count.
The price on the box is a down payment. Air purifier filters are a repeat purchase, and over a few years they often add up to more than the machine. The calculator above adds the unit price to several years of filter replacements so you can compare purifiers on what they'll really cost.
Key takeaways
- Over five years, filters frequently cost as much as the purifier itself.
- A cheap unit with pricey filters can beat a dearer one on the sticker but lose on total cost.
- Set replacements per year from the maker's stated filter life — a 12-month filter is 1/year, a 6-month carbon filter is 2/year. Washable pre-filters don't count.
Compare, don't guess
Before you commit to a model, run this calculator for your two or three finalists and compare the five-year totals — it often reshuffles the ranking. Pair it with the running-cost calculator for the complete cost of ownership, and see how often filters really need replacing so your estimate matches reality.
Frequently asked questions
How much do air purifier filters cost per year?
It ranges widely — from about $30 a year for a budget Levoit to well over $150 for premium machines with large carbon stages. The calculator above works out your figure from the filter price and how often you replace it.
Why does filter cost matter more than the sticker price?
Because you pay it again and again. Over five years, filters often cost as much as the purifier itself, so a cheap unit with expensive filters can end up pricier than a dearer one with affordable filters. Comparing the multi-year total is the honest way to shop.
Can I use cheaper third-party filters?
Sometimes. Good compatible filters can halve the cost for popular models, but quality varies and a poor fit lets air bypass the filter. It's worth checking reviews before switching for the units you own.
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