Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Vapor pressure (hPa)

Required number input.

Invert the Magnus formula to compute dewpoint temperature from water vapor pressure. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Dewpoint (°C)

The resulting dewpoint returned as a number.

• The result is conditional on the stated model, constants, standard state, temperature, pressure, composition, and unit basis. Real mixtures and measurements can depart from ideal behavior and carry uncertainty not represented by a single calculated value.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Vapor Pressure From Dewpoint

  Compute water vapor pressure from dewpoint temperature using the Magnus formula.

• Altitude From Pressure

  Invert the barometric formula to estimate altitude from measured atmospheric pressure.

• Barometric Pressure

  Estimate atmospheric pressure at altitude from temperature using the barometric formula.