Heat Index: NIOSH Calculator

Heat Index: NIOSH Calculator The trusted heat safety calculator for outdoor workers, safety officers, and site supervisors — built on OSHA and NIOSH guidelines to assess heat risk on any job site.

Know your heat risk before it becomes a heat emergency. Enter temperature and humidity, get an instant heat index reading with OSHA-calibrated risk levels and protective recommendations.

Instant Heat Index Calculator Calculate the heat index from any temperature and humidity combination. Based on NIOSH and OSHA standards — the same science used by safety professionals across construction, agriculture, landscaping, and outdoor industries.

OSHA Risk Level Assessment Get immediate risk classification (Lower, Moderate, High, Very High, Extreme) with specific protective measures for each level. Know exactly when to schedule breaks, enforce hydration, or halt outdoor work.

Heat Illness Reference Guide Comprehensive on-the-spot reference for heat-related illness signs, symptoms, and first aid — covering heat stroke, heat exhaustion, heat cramps, heat rash, and rhabdomyolysis.

Designed for Safety Professionals

• OSHA & NIOSH heat index guidelines built in
• Manual temperature and humidity input for any location
• Heat stress risk calculator with color-coded danger levels
• First aid protocols for all heat-related illnesses
• WBGT and wet bulb temperature reference
• Works for construction, agriculture, landscaping, utilities, and more
• Who Uses This App?
• OSHA-trained safety officers and EHS managers
• Construction site supervisors and foremen
• Agricultural and farm labor supervisors
• Landscaping, roofing, and utility crews
• Any outdoor worker exposed to heat risk