Dew Point Table
Find the dew point for any combination of temperature and relative humidity. All values in °C, calculated with the Magnus formula.
| Temp °C ↓ / RH % → | 40% | 45% | 50% | 55% | 60% | 65% | 70% | 75% | 80% | 85% | 90% | 95% | 100% |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 °C | -12.0 | -10.5 | -9.2 | -8.0 | -6.8 | -5.8 | -4.8 | -3.9 | -3.0 | -2.2 | -1.4 | -0.7 | 0.0 |
| 2 °C | -10.2 | -8.7 | -7.3 | -6.1 | -5.0 | -3.9 | -2.9 | -2.0 | -1.1 | -0.3 | 0.5 | 1.3 | 2.0 |
| 4 °C | -8.4 | -6.9 | -5.5 | -4.2 | -3.1 | -2.0 | -1.0 | 0.0 | 0.9 | 1.7 | 2.5 | 3.3 | 4.0 |
| 6 °C | -6.6 | -5.0 | -3.6 | -2.4 | -1.2 | -0.1 | 0.9 | 1.9 | 2.8 | 3.7 | 4.5 | 5.3 | 6.0 |
| 8 °C | -4.8 | -3.2 | -1.8 | -0.5 | 0.7 | 1.8 | 2.9 | 3.8 | 4.8 | 5.6 | 6.5 | 7.2 | 8.0 |
| 10 °C | -3.0 | -1.4 | 0.0 | 1.4 | 2.6 | 3.7 | 4.8 | 5.8 | 6.7 | 7.6 | 8.4 | 9.2 | 10.0 |
| 12 °C | -1.2 | 0.4 | 1.9 | 3.2 | 4.5 | 5.6 | 6.7 | 7.7 | 8.7 | 9.6 | 10.4 | 11.2 | 12.0 |
| 14 °C | 0.6 | 2.2 | 3.7 | 5.1 | 6.4 | 7.5 | 8.6 | 9.6 | 10.6 | 11.5 | 12.4 | 13.2 | 14.0 |
| 16 °C | 2.4 | 4.1 | 5.6 | 7.0 | 8.2 | 9.4 | 10.5 | 11.6 | 12.6 | 13.5 | 14.4 | 15.2 | 16.0 |
| 18 °C | 4.2 | 5.9 | 7.4 | 8.8 | 10.1 | 11.3 | 12.4 | 13.5 | 14.5 | 15.4 | 16.3 | 17.2 | 18.0 |
| 20 °C | 6.0 | 7.7 | 9.3 | 10.7 | 12.0 | 13.2 | 14.4 | 15.4 | 16.4 | 17.4 | 18.3 | 19.2 | 20.0 |
| 22 °C | 7.8 | 9.5 | 11.1 | 12.5 | 13.9 | 15.1 | 16.3 | 17.4 | 18.4 | 19.4 | 20.3 | 21.2 | 22.0 |
| 24 °C | 9.6 | 11.3 | 12.9 | 14.4 | 15.8 | 17.0 | 18.2 | 19.3 | 20.3 | 21.3 | 22.3 | 23.1 | 24.0 |
| 26 °C | 11.4 | 13.2 | 14.8 | 16.3 | 17.6 | 18.9 | 20.1 | 21.2 | 22.3 | 23.3 | 24.2 | 25.1 | 26.0 |
| 28 °C | 13.1 | 15.0 | 16.6 | 18.1 | 19.5 | 20.8 | 22.0 | 23.2 | 24.2 | 25.2 | 26.2 | 27.1 | 28.0 |
| 30 °C | 14.9 | 16.8 | 18.4 | 20.0 | 21.4 | 22.7 | 23.9 | 25.1 | 26.2 | 27.2 | 28.2 | 29.1 | 30.0 |
NormalRed = Dew point is close to room temperature (condensation risk)
How to read the dew point table
Rows show room temperature, columns show relative humidity. The cell value is the dew point in °C.
Example: At 20°C and 65% humidity, the dew point is 13.2°C. If a surface (e.g. exterior wall, window) is cooler than this value, water condenses there – the basis for mold.
Red-marked values show combinations where the dew point is less than 3°C below room temperature. Here the condensation risk on cool surfaces is particularly high.
Never look up manually again
Breeqo Taupunkt calculates values automatically with your sensors – and ventilates when it makes sense.