What doubling does
Every quantity is multiplied by two: 1 1/2 cups becomes 3 cups, 3/4 tsp becomes 1 1/2 tsp. The tool handles the fraction arithmetic so you do not end up guessing whether 2 × 2/3 is 1 1/3.
Where doubling goes wrong
- Pan size: doubling a cake into the same tin doubles the depth — the centre stays raw. Use a pan with twice the area, or bake two tins
- Leavening: doubling baking powder is usually fine; tripling is not
- Salt: taste rather than trust the arithmetic
- Time: a doubled batch needs more time, but not double — check at 75%
Doubling for a crowd
If you are cooking for 16 instead of 8, doubling is the easy case. For anything beyond that, use the recipe scaler with explicit serving counts — it makes the factor visible and lets you scale to 2.5× or 1.75× when a straight double is too much food.
Equipment reality
Most home mixers handle a doubled cookie dough but not a doubled bread dough — the motor and the bowl are the limit, not the recipe. Split dough batches and let them proof separately.
Frequently Asked Questions
Does doubling affect baking time?
Yes, but not proportionally. A deeper batter needs longer at the same temperature; check at 75% of the doubled time.
Can I double a bread recipe?
Yes, but knead and proof in separate batches if your mixer struggles — overworked motors and overflowing bowls are the usual failure.
What about eggs?
Two eggs become four; there is no rounding problem when doubling.
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