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Air Purifier Size Calculator

Lifestyle Tools

CADR to suitable room area per GB/T 18801

Quick Answer

Air Purifier Size Calculator: CADR to suitable room area per GB/T 18801. Air Purifier Size Calculator uses standard everyday life formulas to compute accurate results instantly.

Direction

Pollution scenario

㎡
Required CADR500 m³/h
Coefficient (GB/T 18801-2022)×0.1

Calculation

  1. 1Scenario: Balanced (recommended) (×0.1)
  2. 2CADR = 50 ÷ 0.1 = 500 m³/h
  3. 3Pick a model with particulate CADR at or above this value
  • GB/T 18801-2022: suitable area = particulate CADR × 0.07-0.12. Never mix in formaldehyde CADR.
  • Ceiling above 3 m (loft): discount the theoretical area by ~20%.
  • Leaky old windows: add 10-20%; renovation, pets or smoking: add 20-50% headroom.
  • Bigger is safer — buy 30-50% above the calculated value.
  • For bedrooms, the sleep-mode CADR is what counts, not the max rating.
  • One purifier per closed room; keep it ≥1.5 m from walls.

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How to Use

  1. Enter scenario values: fill real-life numbers into the Air Purifier Size Calculator (defaults work for a quick try).
  2. Instant results: everything computes live, no button needed.
  3. Read the advice: results come with practical tips, reference standards and pitfalls.
  4. Compare options: adjust parameters to compare choices side by side.

Key Points

  • Air Purifier Size Calculator is a free online everyday life tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: CADR to suitable room area per GB/T 18801.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Air Purifier Size Calculator formula

Air Purifier Size Calculator uses standard everyday life formulas to compute accurate results instantly.

FAQ

How do I use the Air Purifier Size Calculator?
Open the page and fill in the input fields — results update automatically. CADR to suitable room area per GB/T 18801.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on common formulas and industry conventions. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Air Purifier Size Calculator[EB/OL]. https://www.yijiansuan.com/en/c/life/air-purifier

Results provided by this tool are for reference only and do not constitute professional advice.