ISO 14644 Particle Concentration Limit Calculator

For cleanroom validators and quality engineers who need to verify theoretical compliance thresholds before deploying air sampling probes or drafting validation protocols.

This calculator applies the ISO 14644-1:2015 standard formula Cn = 10^N * (0.1/D)^2.08 to determine maximum allowed particles per cubic meter for specific sizes.

Maximum Particle Concentration Limit:

0 particles/m³

Formula: Cn = 10N × (0.1 / D)2.08

Preliminary estimation only, not a substitute for review by a qualified/licensed engineer.

How to Use This Calculator

  1. Select your target ISO Class (1 through 9) from the dropdown.
  2. Enter the monitored particle diameter in micrometers.
  3. Press Enter or click Calculate to generate the concentration limit.
  4. Log the resulting particles/m³ value into your validation records.

FAQ

What is the exact mathematical formula used by this calculator?

It applies the ISO 14644-1:2015 standard equation Cn = 10^N × (0.1/D)^2.08, where N is the class number and D is the particle size in µm.

Does this tool replace formal cleanroom certification testing?

No, it provides preliminary theoretical limits only and must be verified alongside your calibrated particulate counters and facility-specific SOPs.

How does the limit change if I move from ISO Class 7 to Class 6?

Lower classes allow fewer particles; Class 6 reduces the permissible concentration roughly tenfold compared to Class 7 for any given particle size.

Once I calculate the concentration limit, what should I test next for air dynamics?

Use our Cleanroom Air Sampling Volume Minimum Calculator to determine the required sample volume for statistically valid results.