Water Boiling Point At Altitude Calculator

Reviewed by the CalculatorHub team, edited by James Graham. Method from USGS Water Science School. Last verified 2026-06-23.

The Water Boiling Point At Altitude Calculator computes water boiling point at altitude from the relation boiling_point = sea_level_bp - altitude_m / meters_per_degree. It takes 3 inputs (boiling point at sea level in deg C, altitude above sea level in m, metres of altitude per 1 degree c drop in m per deg C) and returns the water boiling point at altitude. Home cooks, bakers and anyone catering for a crowd, for the practical kitchen questions of how much of an ingredient to use, how many people a batch will feed, what a quantity comes to in other units, which size option gives more food, and what a dish costs or how it behaves at altitude. Enter your values below and the result updates instantly, and you can share a permalink that pre-fills the exact calculation. Enter quantities in a single measuring system rather than mixing cups with grams part way through, and where an ingredient is involved check whether the recipe means volume or weight, since equal volumes of flour, sugar and liquid do not weigh the same; then round the answer to a figure your scales, jugs, spoons or thermometer can actually work to. For example, with boiling point at sea level = 100 deg C, altitude above sea level = 0 m, metres of altitude per 1 degree c drop = 285 m per deg C, the water boiling point at altitude works out to 100, and the worked example further down the page shows every step so you can follow the arithmetic and reproduce it by hand. The method is the standard form documented by USGS Water Science School, and the figure above each result carries the date it was last verified. The arithmetic scales cleanly but cooking does not, so expect to adjust once you are at the stove: how flour or sugar packs into a cup, oven and pan behaviour, rising and browning times, seasoning and appetite rarely change in the same proportion as the numbers.