How do I scale a recipe from 4 to 6 servings?

Divide desired by original: 6 ÷ 4 = 1.5. Multiply every ingredient by 1.5. A recipe calling for 2 cups of flour becomes 3 cups.

Can I scale a recipe to any ratio?

For most ingredients — yes. Scaling is straightforward for flour, liquid, sugar, and produce. Leavening agents (baking powder, baking soda) and salt often need less proportional scaling for large batches; use your judgment and taste as you go.

Does scaling a recipe affect cooking time?

Scaling ingredients does not automatically change cook time. A doubled batch in the same pan may need 10–20% more time; a batch baked in two pans at the same thickness should take the same time. Watch doneness cues, not just the clock.

How do I scale eggs, which come in whole numbers?

Scale the number normally first. If the result is a non-whole number (e.g., 2.5 eggs), round to the nearest whole egg for most recipes. For precision baking, beat the required number of eggs and measure out the correct fraction by weight.

Recipe Scaler — Scale Any Recipe Up or Down

Scaling a recipe means multiplying every ingredient by the same ratio: desired servings ÷ original servings. Enter each ingredient amount one at a time and the calculator gives you the scaled quantity. The unit stays the same — if you put in cups, the answer is in cups.

How to use the recipe scaler

Enter the original number of servings the recipe makes.
Enter the number of servings you want to make.
Enter the amount of one ingredient (the number only — keep track of the unit yourself).
Read the scaled amount.
Repeat for each ingredient.

The formula

scaled amount = original amount × (desired ÷ original servings)

Example: A cake recipe serves 8 and calls for 3 cups of flour. You want to make it for 12 people.

Scaling factor = 12 ÷ 8 = 1.5

3 × 1.5 = 4.5 cups of flour

What scales proportionally

Most ingredients scale cleanly by ratio:

Flour, sugar, butter, and most dry ingredients
Liquids (water, milk, oil, stock)
Produce (onions, garlic, tomatoes)
Spices and aromatics — scale proportionally first, then adjust to taste

What does not scale cleanly

Leavening agents (baking powder, baking soda, yeast) often need less than the direct ratio when scaling up. A doubled recipe may only need 1.75× the leavening. Over-leavened baked goods can collapse, taste metallic (baking powder), or have an off-yeast flavor.

For doubling a recipe, start at 1.75× leavening and adjust.
For tripling or more, start at 2–2.5× leavening and observe the result.

Salt — scale proportionally for savory dishes but start conservative and taste. Palates are non-linear.

Eggs — scale the number normally. When the result is a fraction (e.g., 2.5 eggs), round to the nearest whole egg for most recipes. For precise baking, beat the whole eggs together and measure out the correct weight.

Cooking time adjustments

Scaling a recipe does not automatically scale the cooking time.

Same pan, more batter: cook time increases slightly — usually 10–20% for a doubled batch
Multiple pans, same thickness: cook time is unchanged — heat exposure per unit of batter is the same
Larger roast or joint: increase time; use a meat thermometer rather than relying on time alone

Practical examples

Halving a cookie recipe

Original: 36 cookies. Desired: 18 cookies. Scaling factor: 18 ÷ 36 = 0.5.

2¼ cups flour → 1⅛ cups (1.125 cups)
1 cup butter → ½ cup
¾ cup sugar → ⅜ cup (6 tablespoons)
2 eggs → 1 egg (round from 1.0)

Scaling a soup from 4 to 10 servings

Factor: 10 ÷ 4 = 2.5.

1 large onion → 2.5 onions (use 2 or 3)
2 cups stock → 5 cups
1 tsp salt → 2.5 tsp (start with 2 tsp and taste)
1 tbsp olive oil → 2.5 tbsp

Recipe Scaler