Calculadora de Índice de Calor (Heat Index)

The Heat Index Calculator estimates the perceived temperature by combining air temperature and relative humidity. Unlike the actual temperature, the heat index reflects how the human body feels heat, as humidity reduces sweat evaporation. The tool uses a simplified version of the Rothfusz model, which also approximately accounts for wind speed.

The calculation is based on the formula: HI = T + 0.33 * (RH/100 * e_sat) - 0.70 * v - 4, where T is air temperature in °C, RH is relative humidity in percentage, e_sat is saturation vapor pressure (calculated internally), and v is wind speed in m/s. The result is an approximate heat index in °C, useful for assessing heat stress risks.

Use this calculator for planning outdoor activities, assessing comfort on hot days, or public health alerts. For example, athletes, farm workers, and event organizers can check if conditions pose a risk of heat exhaustion or heatstroke. The heat index is especially relevant in humid regions, where the perceived temperature can be much higher than the measured one.

Caution: the simplified formula does not replace full meteorological models. For wind speeds above 5 m/s or humidity below 20%, the result may be less accurate. Remember that the heat index does not account for direct solar exposure or individual factors like age or fitness. For very high values (above 40°C), seek medical advice and avoid prolonged exposure.