Dew Point Calculator

Find the dew point from temperature and humidity. Free, private, and runs entirely in your browser.

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Enter values and press Calculate to see the result here.

How this is calculated

The Magnus formula estimates the temperature at which air becomes saturated and dew forms.

γ = ln(RH ÷ 100) + 17.62T ÷ (243.12 + T)

Td = 243.12γ ÷ (17.62 − γ)

What dew point feels humid? Above about 18°C (65°F) feels muggy.

Dew point vs humidity? Dew point is an absolute measure of moisture.