Boiling Point Calculator

Pressure Tools

Calculate the boiling point of water based on atmospheric pressure. Lower pressure causes water to boil at a lower temperature, which is why boiling points change with altitude.

Calculate Boiling Point

Enter atmospheric pressure and choose the unit.

100.00 °C

Estimated boiling point of water at this pressure.

Boiling Point

Equivalent Fahrenheit

212.00 °F

Boiling point converted to Fahrenheit.

Temperature Conversion

Common Boiling Point References

1013 hPa

100°C

900 hPa

96.7°C

800 hPa

93.5°C

700 hPa

89.8°C

Why Boiling Point Changes

High Pressure

Higher boiling point

Low Pressure

Lower boiling point

High Altitude

Water boils sooner

Cooking

May take longer at altitude

Related Tools

Altitude Pressure

Estimate pressure from elevation

Pressure Converter

Convert hPa, inHg, mmHg and PSI

About Boiling Point and Pressure

Water boils when its vapor pressure matches the surrounding atmospheric pressure. At sea level, this usually happens at 100°C or 212°F. When atmospheric pressure is lower, water reaches that point at a lower temperature.

This is why cooking times often change at high elevations and why pressure plays an important role in science, weather, and everyday kitchen use. This calculator provides an estimate of the boiling point of water from pressure readings.