Discomfort Index Calculator
THI comfort score from temperature & humidity
Levels: below 68 comfortable · 68–75 some discomfort · 75–80 about half of people uncomfortable · 80+ most people uncomfortable. The index uses temperature and humidity only — see the heat index for a feels-like temperature.
Discomfort index by temperature & humidity
| Temp＼RH | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|
| 22°C (72°F) | 67 | 68 | 69 | 69 | 70 | 71 |
| 24°C (75°F) | 70 | 70 | 71 | 72 | 73 | 74 |
| 26°C (79°F) | 72 | 73 | 74 | 75 | 77 | 78 |
| 28°C (82°F) | 74 | 76 | 77 | 78 | 80 | 81 |
| 30°C (86°F) | 77 | 78 | 80 | 81 | 83 | 84 |
| 32°C (90°F) | 79 | 81 | 83 | 84 | 86 | 88 |
| 34°C (93°F) | 82 | 84 | 85 | 87 | 89 | 91 |
Yellow 68+ · Orange 75+ · Red 80+
FAQ
What does a discomfort index of 80 mean?
At 80 or above, nearly everyone feels uncomfortable — typical of hot, humid summer afternoons around 30°C (86°F) with 70%+ humidity. Cooling or dehumidifying is recommended.
Discomfort index vs heat index?
The discomfort index is a unitless comfort score, while the heat index expresses a feels-like temperature in degrees. Both combine heat and humidity; the heat index is more common in the US, THI in East Asia.
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