Updated 19 July 2026 · Written by Daniel Wright
A cake sinks in the middle when it is underbaked, the oven door was opened too early, too much baking powder or soda was used, or the batter was overmixed. Bake it fully, keep the door closed until it is nearly set, and measure the raising agents carefully.
Bake until a skewer comes out clean, keep the oven door shut for the first three quarters of baking, and measure baking powder or soda precisely. Underbaking and opening the door early are the top causes.
Why a Cake Sinks
It is underbaked
An underbaked center has not set, so it collapses as it cools. This is the most common cause. Test with a skewer before removing the cake.
The oven door was opened too early
Opening the door in the first three quarters of baking lets in cool air and drops the temperature, collapsing a rising cake before it sets.
Too much raising agent
Excess baking powder or soda makes the cake rise fast then fall. Measure level, not heaped, and use the amount the recipe states.
The batter was overmixed
Overmixing develops gluten and knocks out air, giving a weak structure that sinks. Mix just until combined.
How to Bake a Level Cake
- Test doneness with a skewer or toothpick; it should come out clean or with a few dry crumbs.
- Keep the oven door closed until the cake is at least three quarters baked.
- Measure baking powder and soda level with the spoon, never heaped.
- Mix the batter just until the flour disappears.
- Check your oven temperature with a separate thermometer, as many run cool.
Common Mistakes to Avoid
- Opening the oven door in the first half of baking.
- Using heaped spoons of raising agent.
- Removing the cake before the center is set.
Frequently Asked Questions
Why did my cake sink after I took it out of the oven?
It was almost certainly underbaked, so the center had not set and collapsed as it cooled. Bake until a skewer comes out clean next time.
Does opening the oven door make a cake sink?
Yes, if done too early. Cool air and a temperature drop can collapse a rising cake before its structure sets. Wait until it is nearly baked.
Can too much baking powder cause sinking?
Yes. Excess raising agent makes the cake rise quickly then fall. Measure it level and use exactly what the recipe calls for.
