Recipe Scaler Calculator
Scale any recipe up or down in seconds. Enter your original serving count and desired servings, add your ingredients, and this calculator will compute every scaled amount — displayed as easy-to-measure fractions like ½, ¼, and ⅓.
Recipe Scaler
Enter your recipe's original servings and desired servings, then add your ingredients to scale them instantly.
Presets multiply the original servings count.
Frequently Asked Questions
How do you scale a recipe up or down?
To scale a recipe, divide the desired number of servings by the original number of servings to get the scale factor. Then multiply every ingredient amount by that scale factor. For example, to convert a recipe that serves 4 into one that serves 10, the scale factor is 10 ÷ 4 = 2.5. Two cups of flour becomes 2 × 2.5 = 5 cups.
How do I double a recipe?
To double a recipe, multiply every ingredient amount by 2. For example, if the original recipe calls for 1.5 cups of sugar and 3 eggs, you would need 3 cups of sugar and 6 eggs. Note that for baking recipes, leavening agents like baking soda and baking powder should only be increased by about 1.5–1.75× instead of 2× to avoid a bitter or over-risen result.
What is the formula for scaling recipes?
The recipe scaling formula is: Scaled Amount = Original Amount × (Desired Servings ÷ Original Servings). The ratio of desired servings to original servings is called the scale factor. This calculator applies the formula automatically to each ingredient in your list.
Should leavening agents be scaled the same way as other ingredients?
Not exactly. When doubling a baking recipe, leavening agents (baking powder, baking soda, yeast) should typically be increased by only 75% of the scale factor rather than the full 100%. Too much leavening causes overflow, a coarse texture, or a bitter taste. For a 2× recipe, use about 1.5–1.75× the original amount of leavening agents.
How do I scale a recipe for a large party?
Enter the original servings your recipe yields and the total servings you need. The calculator will compute the scale factor and display the new ingredient amounts. For very large batches (4× or more), consider making the recipe in multiple smaller batches, especially for baked goods, where pan size and oven heat distribution affect results significantly.
How do you convert recipe fractions like ⅓ cup or ¾ cup when scaling?
This calculator automatically handles fractions. When you enter an amount like 0.333 or 0.75, it displays the result as ⅓ or ¾ for easy measuring. If the scaled amount does not match a standard fraction, the value is shown as a decimal (e.g., 1.37).
What do I do with fractional eggs when scaling a recipe?
If scaling produces a fractional egg (e.g., 1.5 eggs), beat the required number of whole eggs together and measure out the fraction by volume — one large egg is approximately 3 tablespoons, so half an egg is about 1.5 tablespoons. In most recipes, rounding to the nearest whole egg also works without significantly affecting the outcome.
Does cooking time change when you scale a recipe?
Cooking time does not scale linearly with ingredient amounts. A doubled recipe does not take twice as long to cook. For stovetop recipes, a larger volume takes slightly longer to heat through. For baked goods, use the same oven temperature but check for doneness earlier and monitor closely. Large roasts and casseroles may need 15–30 extra minutes per additional pound or quart of volume.
How to Scale a Recipe
How to Use This Calculator
Scaling a recipe is straightforward with this tool. Follow these steps:
- Enter the original number of servings your recipe yields.
- Enter the desired number of servings you want to make.
- Use the quick scale presets (½×, 2×, 3×) to set the desired servings automatically.
- Add each ingredient with its name, amount, and unit.
- Click "Scale Recipe" to see the scaled ingredient list with fraction-friendly amounts.
- Use the Copy button to copy the scaled list to your clipboard.
The Scaling Formula
Recipe scaling uses a simple proportional formula. All ingredient amounts are multiplied by a scale factor:
Scale Factor = Desired Servings ÷ Original Servings
Scaled Amount = Original Amount × Scale Factor
For example, if your recipe serves 4 and you want to serve 10:
Scale Factor = 10 ÷ 4 = 2.5
2 cups flour × 2.5 = 5 cups flour
3 eggs × 2.5 = 7.5 eggs (round to 8 for practical use)
This calculator expresses amounts as fractions (e.g., ½, ¼, ⅓) wherever possible for easier measuring.
Common Scaling Ratios
These are the most common recipe scaling scenarios and their corresponding scale factors:
| Scenario | Original → Desired | Scale Factor |
|---|---|---|
| Halve a recipe | 4 → 2 | ×0.5 |
| Double a recipe | 4 → 8 | ×2 |
| Triple a recipe | 4 → 12 | ×3 |
| Scale for a party (6 → 24) | 6 → 24 | ×4 |
| Individual portion from family recipe | 6 → 1 | ×0.167 |
| Meal prep (2 → 10) | 2 → 10 | ×5 |
Measurement Conversion Tips
When scaling results in unusual amounts, use these common measurement equivalencies to simplify measuring:
| Scaled Amount | Practical Equivalent |
|---|---|
| 3 tsp | = 1 tbsp |
| 4 tbsp | = ¼ cup |
| 8 tbsp | = ½ cup |
| 16 tbsp | = 1 cup |
| 2 cups | = 1 pint |
| 4 cups | = 1 quart |
Tip: For fractional eggs (e.g., 1.5 eggs), beat the eggs together and use half the mixture. For small fractions of eggs, one extra egg is usually fine for most recipes.
Baking vs. Cooking Scaling
Scaling behaves differently for cooking and baking. Understanding the difference helps you get better results:
Cooking (Flexible)
- Most ingredients scale linearly
- Salt and spices: scale by 75% when doubling
- Cook time increases slightly for larger volumes
- Pan size should be adjusted accordingly
Baking (Precise)
- Flour, sugar, fat scale proportionally
- Leaveners (baking soda/powder): scale at 75%
- Salt and vanilla: scale at 75%
- Oven temperature stays the same; adjust time
Leavening Agent Rule of Thumb
When scaling baking recipes, reduce leavening agents (baking powder, baking soda, yeast) slightly relative to the scale factor. For a 2× recipe, use 1.5–1.75× leavening rather than exactly 2×. Too much leavening causes overflow and bitter taste; too little results in a dense texture.
Worked Examples
Example 1: Doubling a Chocolate Chip Cookie Recipe
Original: 24 cookies. Desired: 48 cookies. Scale factor: 2×
| Ingredient | Original | Scaled (2×) |
|---|---|---|
| All-purpose flour | 2¼ cups | 4½ cups |
| Butter | 1 cup | 2 cups |
| Sugar | ¾ cup | 1½ cups |
| Eggs | 2 | 4 |
| Baking soda | 1 tsp | 1¾ tsp (not 2) |
Example 2: Scaling Pasta Sauce from 4 to 10 Servings
Scale factor: 10 ÷ 4 = 2.5×
| Ingredient | Original | Scaled (2.5×) |
|---|---|---|
| Tomatoes | 2 cans | 5 cans |
| Olive oil | 2 tbsp | 5 tbsp |
| Garlic cloves | 4 | 10 |
| Salt | 1 tsp | ~2 tsp (taste) |