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Dew Point Calculator

Science & Engineering

T+RH ↔ dew point, condensation check

Quick Answer

Dew Point Calculator: T+RH ↔ dew point, condensation check. Dew Point Calculator uses standard science & engineering formulas to compute accurate results instantly.

℃
%
℃
Dew point
25.1 ℃
Severely oppressive · surface condensation: YES

Calculation steps

  1. 1γ = ln(RH/100) + b·T/(c+T), b=17.62, c=243.12
  2. 2γ = ln(75/100) + 17.62×30/(243.12+30) = 1.6477
  3. 3Dew point Td = c·γ/(b−γ) = 25.08 ℃
  4. 4Surface 18 ℃ ≤ dew point 25.1 ℃ → condensation WILL form

Dew point comfort scale

<10 ℃Dry & comfortable
10–16 ℃Comfortable
16–18 ℃Slightly humid
18–21 ℃Muggy
21–24 ℃Oppressive
>24 ℃Severely oppressive
Dew point is the temperature at which air becomes saturated and water condenses — that is why cold windows "sweat" in winter and pipes drip in humid spring (回南天). To stop condensation: raise the surface temperature (insulation/heating) or lower indoor humidity below the dew point.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Dew Point Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Dew Point Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: T+RH ↔ dew point, condensation check.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Dew Point Calculator formula

Dew Point Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Dew Point Calculator?
Open the page and fill in the input fields — results update automatically. T+RH ↔ dew point, condensation check.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Dew Point Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/dew-point

Results provided by this tool are for reference only and do not constitute professional advice.