Industrial Hygiene
Planning calculators for industrial hygiene — estimates from industry-style inputs.
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Air Sampling Volume Calculator
Calculate total air sample volume from pump flow rate and duration, with STP correction and concentration conversion from analytical results.
PEL Compliance Calculator
Calculate Time-Weighted Average (TWA) exposure and compare against the OSHA Permissible Exposure Limit to assess compliance.
Ventilation Dilution Calculator
Calculate required dilution ventilation airflow (CFM) to maintain a target airborne concentration from a known contaminant generation rate.
Local Exhaust Design Calculator
Calculate required hood airflow, duct size, and face velocity for local exhaust ventilation systems using ACGIH capture velocity principles.
Noise Dose Calculator
Calculate OSHA noise dose percentage and TWA from segmented dBA exposures using the 5-dB exchange rate formula.
Heat Stress Index Calculator
Calculate WBGT (Wet Bulb Globe Temperature) and determine ACGIH-recommended work/rest regimes based on workload intensity.
Biological Monitoring Calculator
Compare biological specimen results (blood or urine) against ACGIH Biological Exposure Indices (BEIs) with creatinine correction for urine samples.
Respirator Selection Calculator
Determine the required OSHA Assigned Protection Factor (APF) and recommended respirator type from airborne concentration and occupational exposure limit.
Radiation Dose Calculator
Calculate occupational radiation dose from external gamma sources using inverse square law, shielding HVLs, and compare against OSHA/NRC annual dose limits.
Chemical Exposure Assessment Calculator
Estimate airborne chemical concentration using the AIHA well-mixed room model, calculate exposure index versus OEL, and assign a risk rating.