| Particle Size | Max Concentration Limit |
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Enter measured counts for each required location. Pass/fail is determined by comparing each location's count and the overall mean to the limits.
Determine the minimum number of sampling locations and maximum allowed particle concentrations for your controlled environment. Designed for quality assurance and facility managers, the calculator applies ISO 14644-1 equations to instantly generate cleanroom validation requirements based on room area and target class. Eliminate manual math errors and ensure audit-ready compliance during cleanroom qualification.
The 2015 revision of the standard uses a fixed statistical lookup table for rooms up to 1000 square meters, eliminating the old square root formula. For rooms larger than 1000 square meters, a specific equation based on a grid pattern applies.
The maximum allowed concentration for a given particle size is derived using the formula Cn = 10^N × (0.1/D)^2.08, where N represents the target ISO class and D is the particle diameter in micrometers.
No, the standard equation specifically applies to particles ranging from 0.1 to 5.0 micrometers. Particles larger than 5.0 micrometers require different classification and monitoring methods defined elsewhere in the standard.
The 2015 revision of ISO 14644-1 removed the UCL calculation for cleanrooms with 2 to 9 sampling locations. It was replaced with a more robust hypergeometric sampling plan that treats each location independently, ensuring a 95% confidence that at least 90% of the room complies.