Boiling Point of Water (barometric correction) ufærdig

The polynomial used in the calculations are valid only in the vicinity of normal atmospheric pressure. A JavaScript capable browser is required for these calculations to work.

Boiling Point of Water Calculator

Boiling Point of Water

Charts giving the boiling point of water vs altitude are based on the standard atmosphere and can be quite misleading. If the barometric pressure is different from the standard atmosphere, the actual boiling point of water will vary from that given in the charts.

For example: If you live in Denver and wish to calibrate your thermometer using boiling water as the standard, the charts will tell you the boiling point of water in Denver is 202°F. If on that day the barometric pressure in Denver is 30.05 inHg, the correct boiling point for water is 212+°F. If your thermometer indicates 212° in boiling water, you will believe it to be 10° high. This means that if you are cooking a chicken to an internal temperature of 170°F in the breast, you will actually overcook by 10°, scratch your head, and wonder why is was dry when you did everything right.

A more reliable way to determine the correct boiling point of water, at a specific time, is to use the calculator below. Just enter the current barometric pressure, in inches of mercury (inHg), and click on "Do Boiling Point Calculation". The correct boiling will be returned in the lower window.
You can visit The Weather Channel and enter your ZIP code to determine you current barometric pressure.

Water Altitude Boiling Point Calculator

This calculator requires the use of Javascript enabled and capable browsers. This calculator takes altitude into consideration in the boiling point temperature of water as well as the atmospheric pressure involved in the calculation. Our base version calculator does not. At a barometric pressure of 30.00 inches of mercury, and an altitude of 500 feet above sea level (ASL), water boils at about 211°F. These are the default values in our calculator. Change the barometric pressure to the value appropriate for your area and click on Calculate. The boiling point of water will be shown as a result.

Designation	Value
Required Data Entry
What is the local barometric pressure?	Inches Mercury
What is the local altitude?	Feet

Calculated Results
The boiling point temperature of water is:	°F

Version 1.4.2

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pressure in hPa	pressure in mmHg	temperature in °C