High-Altitude Baking Calculator
Enter your elevation and recipe to see the published high-altitude adjustments: oven temperature, baking time, leavening, sugar and liquid.
Bake at
—°F
Sources: Colorado State University Extension (CSU) and University of Arizona Extension (UA). Make one change at a time and try the smaller adjustment first, as CSU advises.
Before you bake
These are general starting points from extension services, not a tested recipe. Altitude-tested recipes, such as those Colorado State University Extension publishes, give the most reliable results. Food safety does not depend on these adjustments, but cooking times and temperatures for meat, eggs and canning do change with altitude: followUSDA guidance on high-altitude cooking and use a food thermometer.
Cake adjustments by altitude (Colorado State University Extension)
| Adjustment | 3,500 to 6,500 ft | 6,500 to 8,500 ft | 8,500 to 10,000 ft |
|---|---|---|---|
| Baking powder or soda: for each teaspoon, decrease by | 1/8 tsp | 1/8 to 1/4 tsp | 1/4 tsp |
| Sugar: for each cup, decrease by | 0 to 1 Tbsp | 0 to 2 Tbsp | 1 to 3 Tbsp |
| Liquid: for each cup, add | 1 to 2 Tbsp | 2 to 4 Tbsp | 3 to 4 Tbsp |
| Oven temperature | Increase by 15 to 25 °F | ||
Source: CSU Extension, High Altitude Food Preparation, Table 3. CSU also suggests 1 to 2 Tbsp less shortening in rich cakes, and more egg to strengthen the structure. University of Arizona Extension gives one set of cake figures for all high altitudes: oven 15 to 25 °F hotter, 1 to 2 Tbsp more liquid per cup, 1/8 tsp less leavening per teaspoon, 1 Tbsp less sugar per cup, 1 to 2 Tbsp less fat in richer cakes, and 5 to 8 minutes less baking time per 30 minutes.
How it works
- Your elevation picks the CSU altitude row: 3,500 to 6,500 ft, 6,500 to 8,500 ft (from 6,501 ft), or 8,500 to 10,000 ft (from 8,501 ft). Below 3,000 ft no change is suggested.
- Oven: your temperature + 15 to 25 °F (CSU and UA).
- Time: your time − 5 to 8 minutes for every 30 minutes (UA), rounded to whole minutes. Start checking at the shorter time.
- Leavening: amount × (1 − reduction per teaspoon), rounded to the nearest 1/8 tsp.
- Sugar and liquid: cups × the per-cup change in tablespoons (1 cup = 16 Tbsp).
Related tools
Frequently asked questions
At what altitude do I need to adjust recipes?
The University of Arizona Extension treats elevations over 3,000 feet as high altitude, and Colorado State University Extension says food preparation may need changes above 3,000 feet. Colorado State suggests trying a sea-level recipe unchanged first, because it may need little or no change.
Why do cakes fall at high altitude?
Lower air pressure lets leavening gases expand more and faster, which stretches or breaks the cell structure so the cake rises too much and then falls. Water also evaporates faster, which concentrates sugar and weakens the structure further (Colorado State University Extension).
How much should I raise the oven temperature?
Both extension services suggest 15 to 25 °F higher for cakes, so the batter sets before the gas cells grow too large. The University of Arizona sheet pairs that with 5 to 8 minutes less baking time per 30 minutes.
Do cookies need changes at high altitude?
Often only small ones. Colorado State says many sea-level cookie recipes work, and can be improved by a slight rise in oven temperature, slightly less baking powder or soda, fat and sugar, and slightly more liquid and flour. Neither sheet gives exact amounts for cookies.
What changes for yeast bread?
Dough rises faster at altitude. Let it rise only until just double in size, punch it down and give it a second rise, and use a little less flour or more liquid to get the right consistency (University of Arizona and Colorado State extension sheets).
I live above 10,000 ft. What should I use?
The Colorado State table stops at 10,000 ft. The calculator shows its 8,500 to 10,000 ft row as the closest published guidance; expect to test and adjust further, one change at a time.
Sources
- Colorado State University Extension: High Altitude Food Preparation (PDF) — cake adjustment table by altitude (leavening, sugar, liquid), oven temperature, cookie, quick bread, yeast bread and general tips
- University of Arizona Cooperative Extension: High-Altitude Cooking Quick Tips (PDF) — high altitude defined as over 3,000 ft; oven temperature, baking time, fat, cookie and yeast bread tips
- USDA FSIS: High Altitude Cooking — food safety at altitude
- USGS Elevation Point Query Service — your elevation when you use your location
How each number is produced: methodology and data sources.