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The dew point is the temperature to which air must be cooled for water vapour to condense. Unlike relative humidity, dew point is an absolute moisture measure that stays constant when temperature changes.

公式

Dew Point = (b × alpha) / (a − alpha)

ステップバイステップガイド

1Uses the Magnus formula: alpha = ln(RH/100) + (a × T)/(b + T)
2Constants: a = 17.625, b = 243.04 degrees C
3Dew Point = (b × alpha) / (a − alpha)
4Dew point above 21°C feels humid; above 24°C feels oppressive

解いた例

入力

Temperature 25°C, Humidity 60%

結果

Dew point ~16.7°C — Comfortable

入力

Temperature 30°C, Humidity 80%

結果

Dew point ~26.2°C — Oppressive

入力

Temperature 10°C, Humidity 40%

結果

Dew point ~-3.5°C — Very Dry

よくある質問

What is Dew Point?

How accurate is the Dew Point calculator?

The calculator uses the standard published formula for dew point. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Dew Point calculator use?

This calculator works with inches, Celsius. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Dew Point calculator use?

The core formula is: Uses the Magnus formula: alpha = ln(RH/100) + (a × T)/(b + T). Each step in the calculation is shown so you can verify the result manually.

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