The USDA Lists the Following Recommendations for High-Altitude Adjustments from The Baking Bible by Rose Levy Beranbaum

The USDA Lists the Following Recommendations for High-Altitude Adjustments

Published 2014

Ingredient Adjustment	3,000 feet 914 meters	5,000 feet 1,524 meters	7,000 feet 2,134 meters
decrease baking powder per teaspoon used	⅛ teaspoon	⅛ to ¼ teaspoon	¼ teaspoon
increase liquid per cup used	1 to 2 tablespoons (15 to 30 ml)	2 to 4 tablespoons (30 to 59 ml)	3 to 4 tablespoons (44 to 59 ml)