Identify the sugar cooking stage and adjust the target for altitude.
Sugar stages correspond to water concentration, so the target temperature must fall by the same amount the local boiling point does. At 1,500 metres every stage is about five degrees lower. Cooking to the sea level temperature at altitude overshoots the intended concentration, which turns fudge into brittle.
Candy Temperature Stage
Subtract the local boiling point depression, about one degree per 285 metres of altitude
Subtract the local boiling point depression, about one degree per 285 metres of altitude Sugar stages correspond to water concentration, so the target temperature must fall by the same amount the local boiling point does. At 1,500 metres every stage is about five degrees lower.
Cooking to the sea level temperature at altitude overshoots the intended concentration, which turns fudge into brittle.
This calculator takes 2 inputs: Target stage, Altitude. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.