Tools & Calculators
A catalog of trade calculators for field checks, shop math, and planning estimates. Search by work, material, standard, or category.
Safety
37 live toolsExposure, load, and spacing checks that back up a safety plan: LOTO, scaffold loads, noise dose, heat index, sprinkler hydraulics.
Showing Safety tools. 37 shown.
Tools in Safety
Shops & Outbuildings
87 toolsOutbuildings
22 toolsMachining & Welding
10 toolsBearings
9 toolsPlant Maintenance
24 toolsInstrumentation
18 toolsPipefitting
4 toolsIndustrial
44 toolsSafety
37 toolsActivity-to-Dose Calculator
Convert source activity (Curies or Becquerels) to dose rate at any distance using the specific gamma ray constant. Includes gamma constant reference table for common industrial isotopes.
Air Change Rate Calculator
Calculate air changes per hour and verify ventilation adequacy for any occupancy type.
Arc Flash Incident Energy Calculator
Calculate incident energy, arcing current, PPE category, and arc flash boundary per IEEE 1584-2018. Supports all five electrode configurations with enclosure correction and reduced arcing current analysis.
Arc Flash PPE Category (Table Method)
Look up arc flash PPE category directly from NFPA 70E Table 130.7(C)(15)(a) for AC and (b) for DC systems. No incident energy calculation needed for routine tasks within table limits.
Chemical Exposure Limits Lookup
Look up OSHA PEL, NIOSH REL, and ACGIH TLV exposure limits for common industrial chemicals. TWA, STEL, and ceiling values with hazard notes.
Combustible Dust Reference
NFPA 660 combustible dust hazard reference. Kst and Pmax values for 100+ materials, dust explosion pentagon, housekeeping triggers, and DHA requirements.
Confined Space Ventilation Calculator
Size forced-air ventilation for permit-required confined spaces per OSHA 1910.146. Air changes per hour, duct velocity, and blower CFM for safe entry.
Energized Work Permit Template
Build a printable energized electrical work permit template with shock, arc flash, justification, checklist, and approval fields plus qualified-review warnings.
Fall Protection Clearance Calculator
Calculate total fall clearance distance for personal fall arrest systems. Lanyard length, deceleration distance, D-ring shift, harness stretch, and safety margin per OSHA 1926.502.
Fire Extinguisher Spacing Calculator
Calculate fire extinguisher count and placement per OSHA 1910.157 and NFPA 10.
Fire Sprinkler Hydraulic Calculator
NFPA 13 sprinkler hydraulic calculator. Compute flow using K-factor, Hazen-Williams friction loss in piping, and total system demand at the riser with hose stream allowance.
Gas Cross-Sensitivity Calculator
Check how your catalytic bead or electrochemical sensor reads in the presence of interfering gases. Correction factors for 60+ gas and sensor combinations.
Gas Mixture Flammability Calculator
Calculate LEL/UEL for gas mixtures using Le Chatelier's rule with O2-adjusted limits and dilution analysis. 20 gases, preset scenarios, and safety warnings.
H2S Exposure Reference
Hydrogen sulfide exposure limits, health effects by concentration, detector alarm setpoints, and emergency response actions. OSHA PEL, NIOSH REL, and ACGIH TLV.
Heat Index & Work/Rest Schedule Calculator
Calculate heat index and OSHA heat stress work/rest schedule with water intake recommendations.
LEL/UEL Planning Lookup
Look up LEL and UEL values for 80+ gases and vapors. Enter detector reading to see where you sit in the flammable range with NFPA 497 references.
Ladder & Scaffold Inspection Checklist
Generate OSHA-compliant daily inspection checklists for ladders and scaffolds. Covers 1926.1053 ladder and 1926.451 scaffold requirements with printable output.
Lockout/Tagout Permit Manager
Create OSHA-compliant LOTO permits for equipment energy isolation. Track electrical, pneumatic, hydraulic, and thermal energy sources with lock assignments and zero-energy verification.
Multi-Gas Detector Guide
Source-aware gas-detector sensor review screen for selected hazards. Flags four-gas blind spots, supplemental sensor prompts, and OSHA/NIOSH/manufacturer source gaps; not a purchase specification.
NIOSH Lifting Equation Calculator
Calculate the NIOSH Recommended Weight Limit (RWL) and Lifting Index (LI) for manual lifting tasks. All six multiplier factors with risk assessment.
Noise Dose & TWA Calculator
Calculate noise dose and time-weighted average per OSHA 29 CFR 1910.95 with NIOSH comparison.
Oxygen Displacement Calculator
Calculate oxygen concentration after inert gas release in a confined space. Nitrogen, argon, CO2, and helium displacement with time-to-IDLH estimates.
Radiation Area Posting Guide
Determine radiation area posting requirements from dose rate at 30 cm. Identifies Radiation Area, High Radiation Area, and Very High Radiation Area classifications per 10 CFR 20.1003 and 20.1902.
Radiation Distance Calculator
Calculate dose rate at any distance from a radiation source using the inverse square law. Returns dose falloff table, 2 mR/hr boundary distance per 10 CFR 20.1301, and High Radiation Area boundary.
Radiation Shielding Calculator
Calculate dose rate reduction through lead, steel, concrete, or tungsten shielding using half-value layer (HVL) data. Includes HVL reference table for Cs-137, Ir-192, Co-60, Se-75, and Am-241.
Radiation Stay Time Calculator
Calculate maximum allowable time in a radiation field based on dose rate and applicable dose limit. ALARA planning tool with 10 CFR 20 dose limits, accumulated dose tracking, and comparison table.
Radioactive Decay Calculator
Calculate current source activity from original calibrated activity and elapsed time using the decay equation. Find when a source reaches a target activity for replacement or disposal planning.
Scaffold Load & Tie Calculator
OSHA 1926.451 scaffold loading calculator. Determine platform capacity, leg loads, mudsill sizing, and tie spacing for light, medium, and heavy-duty scaffolding.
Shift Fatigue Risk Estimator
Assess shift fatigue risk using Folkard-Lombardi scoring with checks against API RP 755, NRC, FMCSA, and EU Working Time standards. Includes BAC-equivalent impairment reference.
Shock Approach Boundary Calculator
Look up limited, restricted, and prohibited approach boundaries for shock protection per NFPA 70E Table 130.4(E)(a) for AC and (b) for DC. Visual boundary zone diagram included.
Spill Containment Volume Calculator
Calculate required secondary containment volume per EPA SPCC regulations with precipitation allowance.
Sprinkler Head Spacing & Coverage Calculator
Calculate fire sprinkler head count, spacing, and branch line sizing per NFPA 13 principles. Covers 6 hazard classifications, obstruction 3x rule, sidewall coverage limits, quick-response requirements, and dry pipe reduction factors.
Sprinkler Pipe Friction Calculator
Calculate friction loss in fire sprinkler piping using Hazen-Williams with fittings and velocity check.
Trench Shoring & Protective System Selector
OSHA 1926.652 decision-tree for trench protective systems by soil type and depth. Sloping, benching, shoring, and shielding options with tabulated data.
Trench Volume & OSHA Sloping Calculator
Calculate trench excavation volume and OSHA 1926.652 required slope angles by soil type.
Vapor Density Reference
Vapor density lookup for 90+ industrial gases and solvents. See which gases sink into trenches, pits, and basements vs which ones rise and dissipate.
Ventilation Dilution Calculator
Calculate required dilution ventilation airflow to keep contaminant concentrations below exposure limits. General ventilation for solvents, gases, and vapors.
Electrical
35 toolsProductivity
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23 toolsHVAC
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