Humidity Converter: Convert Relative Humidity to Dew Point
Translate relative humidity into actual moisture: Convert relative humidity and temperature to dew point and absolute humidity, with a comfort scale and full RH-to-dew-point chart.
Dew point
55°F (13°C)
Absolute humidity
10.8 g/m³
Feel
Pleasant
%
What the result says about comfort and condensation
Temperature-to-dew-point spread17°F
Condensation signalLow outdoors
At 75°F and 50% RH, the air is comfortably separated from saturation. A surface must cool to about the dew point before water condenses on it.
Why temperature changes the meaning of relative humidity
Relative humidity only makes sense together with temperature - the same 60% RH feels tropical at 90°F and crisp at 50°F. Enter both and this tool computes the dew point (the honest mugginess number) and the actual water content of the air.
For the evidence, limits and practical use behind this result, read Dew Point vs. Humidity. The weather tools guide explains when each calculator is the right one.
Magnus formula: Td = 243.04·γ / (17.625 − γ)γ = ln(RH/100) + 17.625·T/(243.04+T)
Use dew point for comfort and RH for indoor control
- Use the 60/70 rule: dew point under 60°F feels fine, over 70°F feels oppressive.
- Indoors, aim for 30-50% RH - drier causes static and dry skin, damper feeds mold.
- Ignore afternoon RH drops: the moisture didn't leave; warmer air just holds more. Watch dew point instead.
Dew point comfort scale
| Dew point | How it feels |
|---|---|
| Below 50°F (10°C) | Dry and comfortable |
| 50-60°F (10-16°C) | Pleasant |
| 60-65°F (16-18°C) | Slightly sticky |
| 65-70°F (18-21°C) | Muggy |
| 70-75°F (21-24°C) | Oppressive |
| Above 75°F (24°C) | Miserable |
Humidity, dew point and indoor-air questions
What dew point corresponds to 50% humidity?
It depends entirely on temperature: 50% RH at 86°F (30°C) gives a muggy dew point of about 64°F (18°C), while 50% RH at 50°F (10°C) gives a bone-dry 32°F (0°C). That is exactly why meteorologists prefer dew point.
Can relative humidity exceed 100%?
Briefly and slightly, as supersaturation in clean air - but at ground level 100% means saturation: fog, dew, or rain.
What indoor humidity is ideal?
30-50% RH. Below 30% causes dry skin and static; above 60% encourages dust mites and mold.