ENGINEERING CALCULATORS · 7 TOOLS
Standards-Based Filtration
Engineering Calculators
Pure engineering tools derived from published ISO, SAE, and ASTM standards. Each calculator implements the exact formula from the governing standard, with worked examples and engineering notes. No approximations, no marketing claims.
FLUID CLEANLINESS
ISO 4406 Cleanliness Code Converter
Convert particle counts per mL (≥4 µm(c), ≥6 µm(c), ≥14 µm(c)) to ISO 4406:2021 three-part cleanliness codes, or decode existing codes to particle count ranges. Includes system compliance check against standard target codes.
FILTRATION EFFICIENCY
Beta Ratio ⇄ Filtration Efficiency Calculator
Bidirectional conversion between ISO 16889 Beta ratio (β_x(c)) and single-pass filtration efficiency (E_x(c)). Enter either a Beta ratio or an efficiency percentage; the calculator returns the inverse quantity and downstream particle concentration.
PRESSURE DROP
Filter Pressure Drop Estimator
Estimate filter element differential pressure at operating conditions by proportional scaling from a datasheet reference point. Applies Darcy's Law for laminar flow through filter media. Valid when Reynolds number in the media is below 0.1 (Darcy regime).
SERVICE INTERVAL
Dirt Holding Capacity Planning Estimator
Planning-level estimator for filter element dirt holding capacity and resulting service interval. Uses published media capacity ranges from SAE J1299 and ISO 16889 Annex C. Intended for early-stage filter selection and maintenance planning — not a substitute for ISO 16889 multipass testing.
AIR INTAKE
Air Filter Restriction & Service Life Calculator
Calculate remaining air filter service life based on current measured restriction versus the SAE J1539 service limit of 625 Pa (2.5 in H₂O). Displays restriction utilization as a percentage and provides a service recommendation.
FLUID CLEANLINESS
Fluid Cleanliness Evaluator
Evaluate a hydraulic fluid sample (ISO 4406 code) against the standard cleanliness target for the system type. Returns compliance status, excess contamination per channel, and required particle count reduction ratio to achieve the target.
SERVICE INTERVAL
Service Interval Engineering Calculator
Calculate a recommended filter service interval from known dirt holding capacity (DHC), contamination ingestion rate, system flow, and a safety factor. Based on ISO 3724:2007 and SAE J1299:2008. Applicable to hydraulic, fuel, and lube oil filtration systems.
All calculators implement published standard formulae exactly as specified. Results are planning estimates suitable for engineering evaluation. For certification, specification, or procurement decisions, refer to the governing standard document directly.