Dew Point Calculator

Dew point from temperature and relative humidity using the Magnus formula.

Calculator Numbers & Math Updated Apr 20, 2026
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How to Use
  1. Enter air temperature and relative humidity.
  2. Dew point and comfort band update live.
Input
Result

Formula

Magnus
α = (a·T)/(b+T) + ln(RH/100) · dp = (b·α)/(a−α) · a=17.625, b=243.04
Comfort
<10°C dry · 10-16 comfortable · 16-18 slightly humid · 18-21 humid · >21 very humid

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