Halving a recipe sounds simple — just divide everything by 2. In most cases it is, but a few ingredients need special handling to get right.
The Simple Cases
Most ingredients halve straightforwardly. Just divide by 2:
- 2 cups flour → 1 cup
- ½ cup sugar → ¼ cup
- 1 teaspoon salt → ½ teaspoon
- 1 tablespoon baking powder → 1½ teaspoons
Halving Eggs
Eggs don't divide neatly into two. Options for halving 1 egg:
- Use just the yolk: Rich and binding, good for custards and pastry.
- Use just the white: Lower fat, good for lighter cakes.
- Beat the egg: Lightly beat 1 whole egg, then use half the liquid volume (approximately 1.5 tablespoons for a large egg).
- Use 1 small egg: If you have small eggs, use one whole.
Halving Baking Powder and Baking Soda
Leaveners are critical to get right. ½ teaspoon halved is ¼ teaspoon — a perfectly measurable amount. But ¼ teaspoon halved is ⅛ teaspoon, which is difficult to measure accurately with standard spoons.
At these small quantities, use a kitchen scale for precision. ¼ teaspoon baking powder = about 1.2g. Half that is 0.6g — weigh it directly.
Awkward Fractions
Some fractions that come up when halving:
- Half of ⅓ cup = 2 tablespoons + 2 teaspoons
- Half of ¾ cup = 6 tablespoons (or ¼ cup + 2 tablespoons)
- Half of ⅔ cup = ⅓ cup
For awkward fractions, switch to tablespoons:
- 1 cup = 16 tablespoons → half = 8 tablespoons (½ cup)
- ¾ cup = 12 tablespoons → half = 6 tablespoons
Pan Size Adjustment
When halving a cake recipe, don't halve the pan size. Instead:
- Use a smaller pan (one size down).
- Or bake in the same pan with a shallower layer — reduce baking time and check early.
A Kitchen Scale Makes It Easy
Weigh everything in grams, then divide by 2. No fractional cup confusion, no awkward teaspoon measurements.