Humidity Risk Calculator
Calculate the dew point and mold risk in your room based on temperature and relative humidity.
Room temperature and relative humidity determine the dew point. If wall temperature is close to the dew point, mold risk rises significantly.
Pro tips
- Regular brief airing noticeably lowers humidity.
- Avoid placing furniture directly against exterior walls to improve air circulation.
Frequently Asked Questions
What is the dew point and why does it matter?
The dew point is the temperature at which air moisture condenses into water – if a wall surface gets colder than the dew point, moisture forms, which encourages mold.
What humidity level is ideal indoors?
40-60% relative humidity is generally considered comfortable and safe, leaning lower in the bedroom and briefly higher in the bathroom.
How do I lower humidity in a room?
Regular burst ventilation, a dehumidifier, or more heating (warmer air can hold more moisture) all help effectively.
At what humidity does mold become a risk?
Consistently above 60-65% relative humidity at cold surfaces significantly encourages mold growth, especially on poorly insulated exterior walls.