Cake Altitude Adjustment Calculator
Rewrite a cake recipe for high altitude.
Enter your elevation and recipe amounts for corrected flour, sugar, liquid, leavening, oven temperature and time.
High altitude is where good cake recipes go wrong for reasons that have nothing to do with the baker. Above roughly 3,500 feet (1,070 m) the drop in air pressure changes how a batter rises and sets, and cake is the worst-affected thing in the kitchen.
Why altitude affects baking
At sea level, air pressure is about 101 kPa (14.7 psi). It falls steadily as you climb, and that has two consequences for a cake.
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Gases expand more. The carbon dioxide from baking powder and baking soda pushes against less resistance. The cake rises fast, outruns the structure meant to hold it, and sinks in the middle.
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Water boils cooler. At 6,500 feet it boils near 200°F (93°C) instead of 212°F (100°C). Batter loses moisture faster and takes longer to set, so it dries out while it waits.
The adjustments are per cup
This is the part most printed tables get wrong. Corrections to flour, sugar, and liquid are stated per cup of that ingredient, not as a flat amount for the whole recipe. Adding 4 tablespoons of milk to a one-cup recipe and to a four-cup recipe are not the same correction, and treating them as one is how people end up with soup.
| Altitude | Flour (add/cup) | Liquid (add/cup) | Sugar (reduce/cup) | Baking powder (per tsp) | Oven temp |
|---|---|---|---|---|---|
| 3,500–5,000 ft | +1 tbsp | +2 tbsp | −1 tbsp | −1/8 tsp | +15°F (+8°C) |
| 5,000–7,000 ft | +2 tbsp | +3 tbsp | −2 tbsp | −1/4 tsp | +25°F (+14°C) |
| Above 7,000 ft | +3 tbsp | +4 tbsp | −3 tbsp | −1/4 tsp | +25°F (+14°C) |
Why each one works
- Less leavening because the gas already expands faster than the batter can cope with.
- More liquid to replace what evaporates in the drier, lower-pressure air.
- Less sugar because sugar weakens structure, and the structure is already under strain.
- More flour to stiffen the batter enough to hold the rise.
- A hotter oven to set the edges before the middle has time to collapse.
Worked example
A yellow cake at 6,000 ft: 2 cups flour, 1.5 cups sugar, 1 cup milk, 2 tsp baking powder, 350°F for 30 minutes. That lands in the middle band.
- Flour: 2 cups plus 2 tbsp per cup, so 2 cups + 4 tbsp
- Sugar: 1.5 cups minus 2 tbsp per cup, so 1 cup + 5 tbsp
- Milk: 1 cup plus 3 tbsp, so 1 cup + 3 tbsp
- Baking powder: 2 tsp minus 1/4 tsp per tsp, so 1 1/2 tsp
- Oven: 375°F, and start checking at 24 minutes
Enter those numbers above and you get the same answer.
Two things worth knowing. A recipe already sold as a high-altitude version has been corrected once, and running it through this a second time will ruin it. And if you sit right on a band boundary, start with the gentler band, because it is far easier to add another 1/8 teaspoon of correction than to rescue a cake you over-adjusted.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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