This tool allows you to manually enter the environmental parameters at your site to determine the HLI.

HLI Calculator

If the relative humidity is not available, supply the temperature and wet bulb temperature.
If the BGT is not available, supply the temperature and either: 1: Solar radiation, or 2: location, month, day of month and time of day.

Optionally required if RH or BGT not available
Temperature must be supplied if either the BGT or relative humidity are not available.
Solar radiation must be supplied if BGT is not available. Or Select Month, Day of month, Time of day and location.
Wet bulb temperature must be supplied if relative humidity is not available.
Location must be selected if solar radiation is not known.