Baking Science & Safety ft

High-Altitude Baking Adjuster

How do I adjust baking powder for high altitude? At 3,500 to 6,500 ft use ⅛ tsp less for each teaspoon; more above that.

Cakes fall and spill over at altitude. Enter your altitude and the recipe's baking powder, sugar, liquid and oven temperature to see Colorado State University Extension's adjustments.

How to use it

  1. Enter your altitude.
  2. Enter the recipe's baking powder or soda, sugar, liquid and oven temperature.
  3. Try the smallest change first and adjust one thing at a time.

How it works

The adjustments are CSU Extension's table for cakes, by altitude band: 3,500 to 6,500 ft, 6,500 to 8,500 ft and 8,500 to 10,000 ft.

Lower air pressure makes leavening gas expand more and water evaporate faster, so cakes rise too fast and collapse.

A 15 to 25°F hotter oven sets the batter before the bubbles grow too large.

Assumptions and limits

  • A cake recipe written for sea level.
  • Your altitude, not your city's average.
  • Cookies, quick breads and yeast breads follow CSU's separate notes, linked on the page.

Sources reviewed October 23, 2026.

Quick reference: Cake adjustments by altitude

Adjustment3,500–6,500 ft6,500–8,500 ft8,500–10,000 ft
Baking powder, per tsp⅛ tsp less⅛–¼ tsp less¼ tsp less
Sugar, per cup0–1 tbsp less0–2 tbsp less1–3 tbsp less
Liquid, per cup1–2 tbsp more2–4 tbsp more3–4 tbsp more
Oven15–25°F hotter15–25°F hotter15–25°F hotter

Source: Colorado State University Extension, High Altitude Food Preparation, Table 3.

Tips

  • Fill pans only half full.
  • Grease and flour pans well; cakes stick more at altitude.
  • Make one change at a time and keep notes.

Recipes to try it with

Questions

How do I adjust baking powder for high altitude?

At 3,500 to 6,500 ft use ⅛ tsp less for each teaspoon; more above that.

Do I need to adjust at 3,000 feet?

Usually only slightly; CSU's table starts at 3,500 ft.

Why do cakes fall at high altitude?

The batter rises faster in thin air and collapses before it sets.