Discomfort Index

Discomfort Index is a tool that allows you to easily calculate the "Discomfort Index (DI)" by simply inputting "Temperature (℃)" and "Humidity (%)". When you click "Get today's temperature and humidity at your current location", the temperature and humidity data for your current location (today) will be automatically entered, and you can also calculate the "Discomfort Index for today (today)".

Discomfort Index (DI)
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Comfort Level
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Open-Meteo is used to obtain the temperature and humidity of the current location. Please note that the data is updated every few hours, so it is not a completely real-time current temperature and humidity.
Depending on your browser or settings, you may not be able to get the temperature and humidity of your current location.

How to use

  1. Enter "Temperature (℃)" and "Humidity (%)".
  2. ※If you click "Get today's temperature and humidity at current location", the "Temperature (℃)" and "Humidity (%)" of your current location will be automatically reflected if current location information can be obtained.
  3. The "Discomfort Index (DI)" and "Comfort Level" are automatically displayed.

What is the Discomfort Index?

The Discomfort Index (DI) is a numerical index that expresses the degree of heat and discomfort felt by people based on a combination of temperature and humidity. It is particularly used as a guide for preventing heatstroke and humidity in the summer.

Discomfort index and comfort level

Discomfort index Comfort level guideline
Under 55 Feels cold
55-60 Chilly
60-65 Comfortable
65-70 Feels a little hot
70-75 Feels hot
75-80 Feels uncomfortable
80-85 Very uncomfortable
85 and above Danger level (risk of heat stroke)

Characteristics of the discomfort index

  • The higher the temperature and humidity, the higher the value and the more uncomfortable it becomes.
  • Even if the temperature is the same, if the humidity is high, it feels hotter, so humidity is an important factor.
  • It is often used as a reference for heat stroke prevention and air conditioner settings.

Examples of use in daily life

  • Deciding the air conditioner's temperature setting and dehumidification mode
  • Deciding whether to hold outdoor events or sports
  • Preventing heat stroke (especially in homes with elderly people or children)

How to calculate the discomfort index

DI = 0.81 x temperature + 0.01 x humidity x (0.99 x temperature - 14.3) + 46.3

Temperature (℃): Air temperature

Humidity (%): Amount of moisture in the air

Notes

This tool is available for free.

※This program is created and confirm the operation in PHP8.1.22.
※If you have any inquiries, opinions, or requests that you would like to make, please fill out the following form