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The practical point is that most kitchens don't have a 1/8 cup measure, so use 2 tablespoons — that's the usable answer.
The maths: a US cup is 16 tablespoons, so 1/4 cup is 4 tablespoons, and half of 4 tablespoons is 2 tablespoons.
| Original | Half | Easiest way to measure |
|---|---|---|
| 1 cup | 1/2 cup | 8 tbsp |
| 3/4 cup | 6 tbsp | 6 tbsp |
| 2/3 cup | 1/3 cup | 5 tbsp + 1 tsp |
| 1/2 cup | 1/4 cup | 4 tbsp |
| 1/4 cup | 1/8 cup | 2 tbsp |
| 1/3 cup | 1/6 cup | 2 tbsp + 2 tsp |
| 1/8 cup | 1 tbsp | 1 tbsp |
| 1 tbsp | 1 1/2 tsp | 1 1/2 tsp |
| 1 tsp | 1/2 tsp | 1/2 tsp |
| 1/2 tsp | 1/4 tsp | 1/4 tsp |
| 1/4 tsp | 1/8 tsp | A pinch |
The awkward ones. Two measurements don't halve neatly, and these are worth knowing:
Halving mixed amounts (the other common version of this question):
| Original | Half |
|---|---|
| 1 1/4 cups | 5/8 cup = 1/2 cup + 2 tbsp |
| 1 1/3 cups | 2/3 cup |
| 1 1/2 cups | 3/4 cup |
| 1 3/4 cups | 7/8 cup = 3/4 cup + 2 tbsp |
| 1 cup + 2 tbsp | 1/2 cup + 1 tbsp |
The trick with mixed amounts is to convert everything to tablespoons first, halve, then convert back.
Halving an egg. Recipes that call for one egg are the usual sticking point when halving. Beat the egg thoroughly, then measure out 1 1/2 tablespoons — that's about half a large egg. Alternatively, use just the yolk for richness, or just the white for structure, depending on what the recipe is doing.
When halving works less well. Scaling down is usually straightforward, but a few things don't scale linearly:
The most reliable approach for baking: use a kitchen scale and halve the weights. Halving 250 g of flour to 125 g is exact and instant, with none of the tablespoon arithmetic. It's why professional recipes are written by weight. See also how many grams are in a cup for the conversions.
The closest sibling pages are How Deep Is Lake Tahoe? and How Far Apart Are Cornhole Boards?.
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