The Boiling Point of Water Calculator
What Is the Boiling Point of Water?
At standard sea-level pressure, water boils at about 212°F, or 100°C. In real cooking conditions, the boiling point changes as atmospheric pressure and elevation change. Use this boiling point calculator to estimate the local boiling point of water for thermometer checks, cooking, and calibration.
How to Calculate the Boiling Point of Water
Step 1: Find your local pressure and elevation
Enter your local barometric pressure and elevation below. You can also use your current location to fill in the values automatically.
Your browser may ask for location permission. You can still enter the values manually.
Step 2: Enter your local pressure and elevation, then calculate your local boiling point
Boiling Point Estimate
This estimate is for pure water under typical cooking conditions.
Boiling Point Calculator FAQs
Why does the boiling point of water change with altitude?
Water boils when its vapor pressure matches the surrounding atmospheric pressure. Higher elevation usually means lower air pressure, so water often boils at a lower temperature.
What pressure should I enter?
Enter the local barometric pressure in inches of mercury, or inHg. If you use the location button above, the calculator will fill in the pressure and elevation automatically.
Can I use this to check a food thermometer?
Yes. Bring water to a steady rolling boil, keep the probe tip away from the pot bottom and sides, then compare your thermometer reading with the estimated boiling point shown above.
