High Altitude Hydration Calculator
How much extra water you need at elevation.
Why Water Boils Differently at Altitude
Water boils at 212F at sea level, but the boiling point drops about 1.8F for every 1,000 feet of elevation. In Denver (5,280 feet): water boils at 202F. In Leadville, Colorado (10,152 feet): 194F. This matters because lower-temperature boiling means food takes longer to cook in boiling water — pasta, eggs, rice, and beans all need more time. At 7,000 feet, pasta takes 25-50% longer. Pressure cookers solve this by raising the internal pressure and therefore the boiling point back toward sea level temperatures.
Altitude Effects on Cooking and Baking
Baking is even more affected than boiling. Lower air pressure means gas bubbles in dough expand more, causing cakes to rise too fast and then collapse. The standard altitude adjustment: reduce leavening (baking powder/soda) by 25% per 3,500 feet above sea level, increase liquid by 2-4 tablespoons, and raise oven temperature by 15-25F. These adjustments are why baking at altitude frustrates people — recipes that work perfectly at sea level fail without modification.
Water boils at 202 degrees F at 5,000 feet and 194 degrees F at 10,000 feet, requiring cooking time adjustments.
