Humidity Comfort Index Calculator
Check if your indoor or outdoor humidity is in the comfort zone.
Get health and comfort recommendations based on relative humidity.
Comfort Assessment
Relative humidity (RH) measures how much moisture is in the air compared to the maximum it can hold at that temperature.
Comfort zones:
| RH Level | Comfort | Notes |
|---|---|---|
| Below 20% | Very Dry | Dry skin, static, respiratory irritation |
| 20-30% | Dry | May cause mild discomfort |
| 30-50% | Ideal | Optimal for health and comfort |
| 50-60% | Slightly Humid | Generally acceptable |
| 60-70% | Humid | Mold risk increases |
| Above 70% | Very Humid | High mold risk, dust mites thrive |
Ideal indoor humidity: 30-50% RH at 68-72°F (20-22°C).
Temperature matters: Warm air holds more moisture. Cold outdoor air, when heated indoors, drops in relative humidity. A 50% RH outside at 32°F (0°C) becomes only ~15% RH when heated to 72°F (22°C).