Recipe Scaling CalculatorRecipe Converter for Servings, Multipliers & Pan Sizes
Paste any ingredient list to resize it by servings, a multiplier or a different pan size. Fractions, mixed numbers and ½-style symbols are all understood, and awkward amounts become measurable spoons and cups.
Built & tested by Manzoor Ahmad, Pharmacist & Calculator Developer · Updated
Unit conversions follow NIST US customary measures. Pan areas are standard US bakeware dimensions.
How do you scale a recipe?
Work out a scale factor = new servings ÷ original servings, then multiply every ingredient by it. Doubling is ×2 and halving is ×0.5. For a different pan, use new pan area ÷ old pan area: going from 8×8 to 9×13 is ×1.83. Convert awkward amounts into measurable ones, for example ⅜ cup = 6 tbsp, and round eggs to the nearest half.
Your recipe
Scaled ingredients
Baking pan sizes and areas
Scale a recipe by the ratio of pan areas. For example, an 8×8-inch recipe (64 sq in) in a 9×13-inch pan (117 sq in) needs ×1.83.
| Pan | Area | ≈ Volume | Scale from 8×8 |
|---|---|---|---|
| 8-inch round | 50 sq in | 6 cups | × 0.79 |
| 9-inch round | 64 sq in | 8 cups | × 1.0 |
| 8×8-inch square | 64 sq in | 8 cups | × 1.0 |
| 9×9-inch square | 81 sq in | 10 cups | × 1.27 |
| 9×13-inch | 117 sq in | 14–15 cups | × 1.83 |
| 9×5-inch loaf | 45 sq in | 8 cups | × 0.70 |
How the scaling works
The parser reads whole numbers, decimals, fractions (3/4), mixed numbers (2 1/4) and fraction symbols (½). Lines without a quantity, such as “salt to taste”, are kept unchanged.
Halving chocolate chip cookies (48 → 24)
- 2¼ cups flour → 1⅛ cups
- 1 cup butter → ½ cup
- ¾ cup sugar → 6 tbsp (converted from ⅜ cup)
- 1 tsp salt → ½ tsp
- 2 eggs → 1 egg
Scaling ≠ dosing
People sometimes ask me whether they can “scale” a child’s medicine dose the way you scale a recipe. You can’t. Children’s doses depend on weight and age, and the relationship isn’t linear. Always follow the product label or your pharmacist. In the kitchen, though, scaling is safe and simple. The only ingredients that don’t scale neatly are leavening, salt and spices.
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Recipe Scaling calculator FAQs
Divide the number of servings you want by the original number of servings to get the scale factor, then multiply every ingredient by it. Going from 4 to 6 servings is a factor of 1.5, so 2 cups becomes 3 cups.
Use 1½ eggs. Whisk 2 eggs, then use about 75 g of the mixture (one large egg is about 50 g without the shell), or round to 1 large plus 1 small egg.
Divide the area of the new pan by the area of the old pan and multiply the ingredients by that number. A 9×13 pan (117 sq in) holds 1.83 times as much as an 8×8 pan (64 sq in).
If you use two pans of the same size, the time stays roughly the same. If you use one deeper pan, it takes longer, often 25–50% more, so check doneness rather than the clock.
For small changes, yes. For tripling or more, increase leavening, salt and strong spices by about 1.5× and taste, because they don’t scale linearly in large batches.
⅜ cup = 6 tablespoons. 1 cup = 16 tbsp, ¼ cup = 4 tbsp, and ⅛ cup = 2 tbsp.
Manzoor Ahmad
Pharmacist · Supplement & Nutrition Writer (9+ yrs) · Calculator Developer (13+ yrs)
I’m a pharmacist and the developer behind DexoCalc. Converting measurements accurately is part of my working day. This tool parses real recipe lines, including fractions and mixed numbers, and turns odd decimals into amounts you can actually measure.
References
- NIST. Approximate Conversions from U.S. Customary Measures to Metric.
- USDA. FoodData Central (egg weights).
Note: Scaled amounts are rounded to practical kitchen measures. Baking chemistry and cook times may need adjusting for very large or very small batches.