Recipe Serving Size Calculator
Scale ingredient amounts for your household, a dinner party, or a batch of meal prep. Enter the recipe’s original servings and the number you want to make.
How to scale a recipe accurately
The calculator divides your new serving count by the original count, then multiplies each ingredient amount by that ratio. A four-serving recipe scaled to six servings uses a factor of 1.5. One cup becomes 1.5 cups, and half a cup becomes 0.75 cups. You can enter decimals, fractions such as 1/2, or mixed fractions such as 1 1/2. The result uses decimals to keep it readable.
Keep a consistent format: quantity first, then the unit and ingredient. A line such as “salt to taste” has no numeric amount and cannot be scaled, so leave it out of the input and adjust it separately. The tool preserves your ingredient description; it does not interpret units or convert cups into grams.
What should not be multiplied blindly?
Seasoning is a starting point, not a fixed rule. When doubling a soup, add some of the scaled salt first and taste before adding the rest. Pan size, depth and oven performance affect baking, so doubling a cake recipe does not mean doubling its baking time. Divide the batter between suitable pans or use a recipe written for the larger size. Leavening and egg substitutions can also behave differently in large batches.
A practical meal-prep example
If a lentil bowl recipe makes two servings and you need five, use a factor of 2.5. A recipe containing 200 grams of cooked lentils needs 500 grams; 80 grams of dry rice becomes 200 grams. Be careful to preserve the original state of each ingredient: cooked lentil weight is different from dry lentil weight. Label containers with the preparation date and follow appropriate food-storage guidance.
Can I halve a recipe?
Yes. Set the new servings to half of the original count. Use a kitchen scale when a result is too small to measure reliably with a spoon.
Does this change calories or protein?
No nutrition analysis is performed. The calculator only scales quantities. For nutrient information, use the actual ingredient labels or a reliable food composition database.
Next: use the cooking unit converter or calculate an ingredient’s cost per serving.
Worked example: four portions of overnight oats become six
This is a quantity exercise, not a tested recipe. Suppose your four-portion recipe uses 200 g oats, 600 ml soy milk, 120 g peanut butter and 200 g berries. Set original servings to 4 and new servings to 6; paste each quantity on its own line. The ratio is 1.5.
| Ingredient | 4 portions | 6 portions |
|---|---|---|
| Oats | 200 g | 300 g |
| Soy milk | 600 ml | 900 ml |
| Peanut butter | 120 g | 180 g |
| Berries | 200 g | 300 g |
Turn the result into a practical preparation plan
Use six suitable containers instead of making the original containers larger. Equal portions of this ingredient list would each contain 50 g oats, 150 ml milk, 30 g peanut butter and about 33.3 g berries. Rounding berries to a convenient weight changes the total slightly; that is a deliberate kitchen choice. The calculator cannot predict soaking texture, sweetness, allergies or shelf life. Follow a reliable recipe for preparation and safe storage.
Small quantities need a different decision
Halving 1 teaspoon gives 0.5 teaspoon, but halving a pinch is difficult to measure. Start conservatively and taste where it is safe to do so. Do not round baking soda, salt or spices in the same way you might round chopped vegetables. The unit converter can help with defined volume units, but it cannot infer the weight of your particular ingredient.