Last updated: March 2, 2026 by Dr. David Park

Dew Point Calculator

Formula

Td = 243.04 × [ln(RH/100) + 17.625T/(243.04+T)] / [17.625 - ln(RH/100) - 17.625T/(243.04+T)].

Calculate the dew point using the Magnus-Tetens approximation. The dew point indicates the temperature at which air becomes saturated and condensation begins to form.

Common use cases:

  • HVAC system design
  • Fog prediction
  • Comfort level assessment

Frequently Asked Questions

DD

Dr. David Park

Applied Mathematician, PhD Mathematics

David holds a PhD in Applied Mathematics from MIT. He has published research on numerical methods and computational algorithms used in engineering and scientific calculators.

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