Boiling Point Altitude Calculator: At What Temperature Does Water Boil Up There?
Lower air pressure at altitude lets water boil cooler. This calculator estimates that temperature from height alone.
What is the Boiling Point Altitude Calculator?
Water boils cooler as you climb, which changes cooking times. Enter an altitude in metres and this tool estimates the boiling point, roughly 1 degree lower per 300 metres of height, as a practical approximation.
How to use it
- Enter your values in the fields provided.
- Click Estimate Boiling Point.
- Read the result and adjust an input if you want a different outcome.
Worked example
At 1500 metres, water boils at about 95 C instead of 100 C.
At what temperature does water boil at 1500 metres?
At roughly 1 degree lower per 300 metres, 1500 metres lowers the boiling point by 5 degrees, to about 95 C.
Frequently asked questions
What do I enter to get a result?
Fill in every field with your own numbers or choices, then run the tool. Empty number fields count as zero, so check them before you trust the output.
Can I reuse this result elsewhere?
Yes. The result is calculated in your browser from the values you entered, so you can copy the numbers into your own notes or plan.