Know the Heat Before It Hurts
Instant WBGT heat stress assessment using your live GPS location. OSHA risk levels, work/rest ratios, and 24-hour forecast — zero setup.
Start Now — It's FreeAuto GPS Detection
One tap — your device GPS finds your exact coordinates and loads live weather data instantly.
Live WBGT Reading
Real-time wet bulb globe temperature from Open-Meteo API. Updated every 5 minutes automatically.
OSHA Risk Levels
Color-coded Low → Extreme risk with mandatory work/rest ratios per OSHA & NIOSH guidelines.
24-Hour Forecast
Plan your shift ahead. See when peak heat hits and when conditions improve.
✅ ISO 7243
✅ OSHA
✅ NIOSH
✅ Free & No Signup
✅ Mobile-Friendly
Frequently Asked Questions
What is WBGT?
WBGT (Wet Bulb Globe Temperature) is the global standard for measuring environmental heat stress. It combines air temperature, humidity, wind speed, and solar radiation into a single index. OSHA and NIOSH use WBGT to set work/rest ratios and prevent heat-related illness.
How does this calculator work?
It uses your device GPS to get your exact location, fetches live weather data from Open-Meteo API, calculates WBGT using the ISO 7243 formula, and maps it to OSHA risk levels with recommended work/rest ratios.
Do I need to log in?
No. The tool is 100% free, no signup required. It runs entirely in your browser — your data stays on your device.
Which standards does it follow?
The calculator follows ISO 7243 (WBGT estimation) and OSHA/NIOSH heat stress guidelines for risk classification and work/rest schedules.
Need Heat Stress Management at Scale?
HSEKit turns one-off readings into a full heat stress management system — automated alerts, shift logging, compliance reports, and trend analytics across all your sites.
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