Baking · elevation
High-altitude baking calculator
Bakes failing at elevation? Get the leavening, liquid, sugar and oven adjustments for your altitude — as honest starting points, the way the experts give them.
Why baking changes at altitude
Above about 3,000 feet, the air pressure drops enough to throw off recipes developed at sea level. Three things happen:
- Gases expand more. Baking powder, soda, and yeast produce the same gas, but it expands further before the batter sets — so things over-rise and then collapse.
- Liquids evaporate faster and water boils cooler, so batters dry out and can set before they're cooked through.
- Sugar concentrates as moisture leaves, which weakens the structure.
The standard fixes counter each effect: cut the leavening so it doesn't over-expand, add liquid to offset evaporation, trim the sugar to firm up the structure, and raise the oven temperature to set the batter sooner (then check a bit early, since it bakes faster).
These are starting points, not a formula
High-altitude baking is genuinely trial-and-error. The numbers above come from Colorado State University Extension guidance — the standard reference — but the right adjustment depends on your exact elevation, your oven, and the specific recipe. CSU's own advice: change one thing at a time, take notes, and refine. Cakes need the most help; cookies often need almost none. We give you a sensible place to start, not a guarantee.
At what elevation do I need to adjust recipes?
Generally above about 3,000 feet. Below that, most recipes bake as written. The higher you go, the more adjustment is needed.
What are the main high-altitude adjustments?
Reduce chemical leavening (about ⅛–¼ tsp per tsp), add 1–4 tbsp of liquid per cup, slightly reduce sugar, and raise the oven 15–25°F so the batter sets before it over-rises.
Why do my cakes sink at high altitude?
Lower air pressure lets the leavening gases expand too far before the batter sets, so the cake balloons and then collapses. Reducing the leavening and raising the oven temperature both help.
Do cookies need adjusting?
Usually very little. Cookies are thin and bake fast, so they tolerate altitude well — a small cut in leavening and a touch more liquid is often enough.