Discomfort Index Calculator
Just enter the temperature and humidity to calculate the discomfort index (DI), a measure of how muggy it feels. Instantly see comfort levels such as comfortable, slightly hot, or hot and sweaty.
Input
Calculate the discomfort index (DI) from temperature and humidity as a guide to how muggy it feels. This is a simplified measure that ignores wind and sunlight, so treat the result as a rough sense of comfort.
Result
Discomfort Index (DI)
78.4
How it feels: Hot and sweaty
How it feels
Hot and sweaty
Temperature
28.0 ℃
Humidity
70.0 %
Roughly speaking, at a DI of 75 or above more than half of people feel discomfort, and at 80 or above almost everyone feels uncomfortable from the heat.
Discomfort index comfort levels
| How it feels | Discomfort index |
|---|---|
| Cold | Below 55.0 |
| Chilly | 55.0 – under 60.0 |
| Neutral | 60.0 – under 65.0 |
| Comfortable | 65.0 – under 70.0 |
| Slightly hot | 70.0 – under 75.0 |
| Hot and sweaty (current) | 75.0 – under 80.0 |
| Unbearably hot | 80.0 – under 85.0 |
| Intolerably hot | 85.0 and above |
How it works
- The discomfort index (DI) quantifies how muggy the air feels based on temperature and humidity. This tool uses the formula DI = 0.81 × temperature(℃) + 0.01 × humidity(%) × (0.99 × temperature − 14.3) + 46.3.
- The comfort levels are rough guides. A DI below 70 feels comfortable, in the 70s it feels slightly hot, at 75 or above more than half of people feel discomfort, and at 80 or above almost everyone feels uncomfortable from the heat.
- The calculation uses only temperature and humidity; it does not account for wind, sunlight, clothing, or individual differences. The same discomfort index can feel different depending on conditions.
- The discomfort index is handy as a measure of mugginess, but it does not directly indicate the risk of heatstroke. Also check heatstroke indicators such as the Wet Bulb Globe Temperature (WBGT).
- Results are approximate estimates only. For decisions affecting health and safety, refer to official sources such as your national meteorological agency or professional advice.
Related calculators
Incandescent to LED Savings
EnvironmentQuickly estimate how much you can save on yearly electricity and CO2 by replacing incandescent bulbs with LED or fluorescent lamps, based on wattage, hours of use, and the number of bulbs.
Open calculator →Car-to-Bicycle Commute Savings
EnvironmentEstimate how much fuel money and CO2 you can save each year, and how many calories you'll burn, by replacing your car commute with a bicycle.
Open calculator →Appliance Replacement Savings
EnvironmentEstimate the annual electricity savings, CO2 reduction, and payback period when you replace an old appliance with an energy-efficient model, straight from the power consumption.
Open calculator →Air Conditioner (Cooling) Electricity Cost & CO2
EnvironmentEstimate the electricity cost and CO2 emissions of running an AC in cooling mode from its power draw (W), hours, and days. You can also pick by room size.
Open calculator →