How to Adjust Any Recipe for High Altitude

Any sea-level recipe can work at altitude with six small changes. Here's the order to make them in, and how much to change.

1. Know your altitude

Adjustments start mattering at about 3,000 feet and scale up from there. Search "elevation of [your town]" once and remember it.

2. Reduce the leavening

Cut each teaspoon of baking powder or soda by 1/8 tsp at 3,000–5,000 ft, up to 1/4 tsp at 7,000+. Gas expands more in thinner air, so less goes further.

3. Reduce the sugar slightly

Take out up to 1 tablespoon per cup (more above 7,000 ft). Faster evaporation concentrates sugar, which weakens structure.

4. Add liquid

Add 1–2 tablespoons per cup at 3,000 ft, up to 3–4 tablespoons at 7,000+. This replaces what evaporates early in the bake.

5. Raise the oven, shorten the bake

Bump the oven 15–25°F and start checking 5–8 minutes early per half hour of baking time. A faster set stops over-rising.

6. Add a little flour if needed

Above 5,000 ft, 1–2 extra tablespoons per cup adds structure. Above 7,000, use 2–4.

Skip the math

The calculator applies all six steps to your exact recipe and altitude. Or use the printable chart, or start from a pre-adjusted recipe: chocolate chip cookies, banana bread.