How to Make Two-Thirds of a Recipe
To make two-thirds of a recipe, multiply each ingredient by 2/3. For one-third, use 1/3. Enter the fraction directly rather than rounding it to 0.67 or 0.33, especially when measuring a small amount.
- 3 min read
- Updated 2026-10-22
Printable conversion chart
Use your browser’s Print command for this chart and your scaled ingredient list.
| Original | Two-thirds | One-third |
|---|---|---|
| 1 cup | ⅔ cup | ⅓ cup |
| ¾ cup | ½ cup | ¼ cup |
| ½ cup | ⅓ cup | 2 tbsp + 2 tsp |
| ¼ cup | 2 tbsp + 2 tsp | 1 tbsp + 1 tsp |
| 1 tbsp | 2 tsp | 1 tsp |
| 1 tsp | ⅔ tsp | ⅓ tsp |
| 150 g | 100 g | 50 g |
| 3 eggs | 2 eggs | 1 egg |
US kitchen measures: 1 cup = 16 tablespoons; 1 tablespoon = 3 teaspoons. Weight examples are arithmetic, not ingredient density conversions.
Scale your ingredients
Replace the example in the scaler below with your ingredients, one quantity per line. The starting multiplier is 2/3; change it for your conversion direction or batch size. This scales quantities, not baking time or ingredient densities.
Work through an awkward measure
Half a cup is 8 tablespoons or 24 teaspoons. One-third of that is 8 teaspoons, which is 2 tablespoons plus 2 teaspoons. For two-thirds of 1 teaspoon, use two level ⅓-teaspoon measures if available. A rough pinch is a poor replacement for a measured fraction of baking soda or salt.
Divide eggs by their measured weight
For two-thirds of a recipe calling for 2 eggs, beat the eggs together until uniform, weigh without shells, and use two-thirds of that weight. If they weigh 102 g, use 68 g; for one-third, use 34 g. If the recipe separates whites and yolks, scale each component separately rather than combining them.
Store the remaining egg promptly
Refrigerate unused raw egg right away. Do not leave it at room temperature for more than 2 hours, or more than 1 hour above 90°F, following FDA food-storage guidance. The time spent preparing and measuring counts toward that limit.
Choose a pan or smaller portions
Two-thirds of a batch needs about two-thirds of the original pan area to preserve depth. Leaving it in the original pan makes a thinner layer that may finish sooner. For cookies or muffins of unchanged size, make fewer portions and begin near the original baking schedule. Keep the original oven temperature unless the recipe says otherwise.
Scale every component once
Use 2/3 in the scaler above and paste the complete ingredient list, including filling or topping. Read instructions for divided ingredients so you preserve each share. Do not cut the already-scaled quantities again. Baking powder and soda normally scale with the other ingredients; baking minutes do not.
Frequently asked questions
What decimal is two-thirds?
It is 0.6666…; entering 2/3 preserves the fraction without early rounding.
What is two-thirds of three eggs?
Two eggs, using the same egg size as the recipe.
What is one-third of half a cup?
In US measures, 2 tablespoons plus 2 teaspoons.
Do I reduce oven temperature by one-third?
No. Scale ingredient quantities, then adjust pan or portion count and check doneness.