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

Altitude (m)

Required number input.

Temperature (K)

Required number input.

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

Atmospheric pressure (hPa)

The resulting atmospheric pressure returned as a number.

• Simple gas relationships often assume equilibrium and ideal-gas behavior. High pressure, low temperature, condensation, composition changes, and nonzero compressibility can require a real-gas equation of state.
• 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.

• Altitude From Pressure

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

• Dewpoint From Vapor Pressure

  Invert the Magnus formula to compute dewpoint temperature from water vapor pressure.

• Vapor Pressure From Dewpoint

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