Decision Lantern

Home and office calculator

Air-purifier CADR planner

Reviewed Skip to the planner

People matching a portable purifier to room size. The decision this page isolates is narrow on purpose: estimate a cadr class from room area. Fit and capacity are the expensive mistakes. Settle those before you commit to a finish or a brand.

This page produces an explainable category or size so options can be compared without a product ranking. The calculator does not rank Coway, Levoit, and Blueair. It produces an explainable class so Coway Airmega 230, Levoit Core 400S, and Blueair Blue Pure 211i Max can be compared as examples of that class.

The working method is: Use a 1.5 CADR-per-square-foot planning floor and raise it when pets or dust are present. Planning notes are grounded in Association of Home Appliance Manufacturers. CADR is not a medical or allergy-treatment claim.

How to use this calculator

People matching a portable purifier to room size. Estimate a CADR class from room area. If you can answer room square feet, this page can produce a class you can shop against.

What this page will not do

  1. Enter the planning inputs

    Estimate CADR class by recording room square feet. Use real measurements or counts, not a rounded marketing number.

  2. Mark the constraints that change the class

    Only check pets or visible dust when that constraint is actually present. Extra checks can jump the class.

  3. Read the cadr class

    Estimate CADR and treat the headline as a class, not a product name. Matching examples below follow Medium, Compact, and Large.

  4. Compare official pages, then verify

    Open the official page for each example in that class. Confirm current specifications, dimensions, and terms. Decision Lantern does not quote a live price or complete an install review.

Planning classes on this page

Medium
Example: Coway Airmega 230, Levoit Core 400S, Blueair Blue Pure 211i Max
Compact
Example: Coway Airmega 230
Large
Example: Coway Airmega 230, Levoit Core 400S, Blueair Blue Pure 211i Max

Estimate CADR class

CADR class

Large-room CADR

About 300 smoke-CADR planning floor

Compare options with at least:

  • 200 sq ft
  • Use the manufacturer’s CADR and recommended room size, not a health claim

Example products for Air-purifier CADR planner

Real products that fit this planning category. Specs come from the manufacturer’s product page. These are examples, not rankings. Product names that go to Amazon are associate links. Decision Lantern may earn a commission at no extra cost to you.

Compare the official examples

The table below is a side-by-side of the official examples on this page. Columns are published facts—maker, planning class, and notes taken from the official page—not scores. Coway Airmega 230, Levoit Core 400S, and Blueair Blue Pure 211i Max are included so you can see how classes differ, then open the official page for the current specification.

Published facts for the example products on this page. Not a ranking.
ExampleMakerPlanning classesPublished notesOfficial page
Coway Airmega 230CowayMedium, Compact, LargeHEPA; Published CADRCoway Airmega 230 official page
Levoit Core 400SLevoitMedium, LargeSmart HEPA; Room-size ratingLevoit Core 400S official page
Blueair Blue Pure 211i MaxBlueairLarge, MediumHigh CADR; Washable prefilterBlueair Blue Pure 211i Max official page

Which example fits which class

Coway Airmega 230

Coway

Coway Airmega 230 from Coway is an example in the Medium, Compact, and Large class. Published notes on the official page include HEPA and Published CADR. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

Levoit Core 400S

Levoit

Levoit Core 400S from Levoit is an example in the Medium and Large class. Published notes on the official page include Smart HEPA and Room-size rating. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

Blueair Blue Pure 211i Max

Blueair

Blueair Blue Pure 211i Max from Blueair is an example in the Large and Medium class. Published notes on the official page include High CADR and Washable prefilter. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

What to verify before you buy

How this estimate works

Use a 1.5 CADR-per-square-foot planning floor and raise it when pets or dust are present.

Know the limits

  • CADR is not a medical or allergy-treatment claim.
  • Filter replacement cost is separate.
  • Provider specifications and program terms can change and must be verified on official pages.

Frequently asked questions

How does the air-purifier cadr planner work?

It converts room square feet into a planning class using a published rule. Use a 1.5 CADR-per-square-foot planning floor and raise it when pets or dust are present. The headline is a class such as Medium, Compact, and Large, not a vendor ranking.

Is Coway Airmega 230 better than Levoit Core 400S?

This page does not rank Coway Airmega 230, Levoit Core 400S, and Blueair Blue Pure 211i Max. Coway Airmega 230 and Levoit Core 400S are listed because they are real products with official pages that map to different or overlapping classes. The useful question is which class matches your inputs.

Can I treat the result as a buying recommendation?

CADR is not a medical or allergy-treatment claim. Use the class to decide what to read next, then verify fit, terms, and installation requirements on the official page and with a qualified installer when the product needs one.

Do the product links earn Decision Lantern a commission?

Not on the current preview. Links go to official manufacturer or service pages. If compensated links are added later, the disclosure on this page will say so in plain language.

What should I verify after I get a class?

Confirm the current specification, dimensions or plan limits, and any program terms on the official page. Filter replacement cost is separate. The next editorial review for this page is due 2026-11-14.

Why these 3 examples?

They are real home and office options with an affiliate program on file and an official product page. Coway, Levoit, and Blueair appear because each one can represent at least one planning class on this page, not because Decision Lantern tested or endorsed them.

Sources

  1. AHAM air-cleaner certification, Association of Home Appliance Manufacturers. Retrieved .

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