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Water Boiling Point from Standard Atmosphere Altitude

Estimate pressure and water boiling temperature from elevation using two empirical standard-atmosphere relations.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

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At zero elevation, the model pressure is 29.921 inHg and the fitted boiling temperature is close to 100 °C.

P = 29.921(1 − 0.0000068753h)^5.2559 inHg; T = 49.161 ln(P) + 44.932 °F, with h in feet.

Enter these known values and leave the other values blank.

The altitude formula is a standard-atmosphere approximation. Local weather changes pressure and the actual boiling point.
The model is limited here to altitude between −1,000 and 30,000 feet. It is not a high-altitude atmospheric model beyond that range.
The second relation is an empirical fit for pure water. Dissolved substances and pressurized vessels change boiling behavior.
Pressure and temperature are calculated outputs; they do not provide altitude inverses.

Weather and the liquid composition affect boiling temperature. This model uses an idealized atmosphere.

This tool derives pressure from altitude. Its pressure and boiling-temperature fields are outputs.

Declare the physical or stated approximation domain; captured arithmetic is unchanged.