Room Size Calculator

Enter your room dimensions to find the minimum CADR you need — based on AHAM's 4.8 air changes per hour standard.

Unit:

Length (ft)

Width (ft)

Ceiling (ft)

Room Area

13.4

m²

Min CADR

CFM (4.8 ACH)

Room Volume

107

m³

Air Changes Per Hour (ACH) Reference

Purifier CADR	ACH for Your Room	Rating

🧰 More free tools

📐 CADR Calculator → 💰 Cost Calculator → 🔍 Purifier Finder →

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Got readers who care about clean air? Drop this calculator into any page — no signup, no fees, just paste the code. Links back to us so we can keep building free tools.

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Free to use. No registration required. Works on any website.