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Recipe Scaler
Scale any recipe up or down instantly by entering the original servings and your desired serving count. All ingredient quantities are automatically recalculated proportionally — perfect for cooking for a crowd, halving a recipe, or meal prepping.
Whether you are doubling a cake recipe for a party or halving a soup recipe for one, scaling recipes accurately is essential for consistent results. This calculator handles the math instantly — no more mental arithmetic or fractions when you need to adjust serving sizes.
Formula
Scaled Amount = Original Amount × (Desired Servings / Original Servings) | Scale Factor = Desired / Original
How to Scale Recipes Successfully
Most ingredients scale linearly — double the servings, double everything. However, some ingredients and techniques need adjustment when dramatically scaling recipes. Understanding these exceptions prevents scaling disasters.
Ingredients That Do Not Scale Linearly
Ingredient/Factor
Scaling Rule
Reason
Salt & spices
Scale to 75% when doubling — taste and adjust
Too much salt cannot be fixed
Leavening (baking powder/soda)
Use 75-80% when scaling up 2-3×
Excess causes bitter, fallen cakes
Eggs
Round to nearest whole egg
Cannot halve an egg precisely
Alcohol/extracts
Scale at 50-75%
Volatile flavors intensify
Cooking time
Does NOT scale — test with thermometer
More food ≠ longer time always
Pan size
Scaling recipe often requires different pan
Depth and heat transfer change
Scaling for Baking vs Cooking
Cooking (soups, stews, sauces) scales easily — most recipes can be doubled or tripled without adjustment beyond ingredient amounts. Baking is more sensitive — chemical reactions between leavening, flour, and moisture are precise. When scaling baked goods by more than 2×, consider making multiple batches instead of one large batch for more consistent results.
Pan Size for Scaled Recipes
When scaling baked goods, pan size matters critically. Double a 9×9 cake: use two 9×9 pans (not one huge pan). For a different pan size, calculate the area ratio: 9×13 pan (117 sq in) vs 8×8 pan (64 sq in) = 1.83× — scale the recipe by 1.83. Never fill a baking pan more than 2/3 full.
Frequently Asked Questions
Divide desired servings by original: 6/4 = 1.5 (scale factor). Multiply every ingredient by 1.5. 1 cup flour → 1.5 cups. 2 eggs → 3 eggs. 1 tsp salt → 1.5 tsp (or 1 tsp + 1/2 tsp). Cooking time stays approximately the same — test for doneness rather than relying on time.
Most savory recipes (soups, stews, pasta sauces) double easily. Baking recipes can be doubled but may need slight adjustments: reduce leavening (baking powder/soda) to 75% of doubled amount, use the same amount of salt as doubled (not 2×), keep cooking temperature the same, and monitor doneness with a thermometer rather than time.
The scaling factor is the ratio of desired servings to original servings. Scale factor = desired servings / original servings. Factor of 2.0 = double the recipe. Factor of 0.5 = halve the recipe. Factor of 1.5 = recipe for 6 when original serves 4. Multiply every ingredient by this factor.
Divide desired servings by original to get scale factor (e.g., 2/6 = 0.333 for a 6-serving recipe scaled to 2). Multiply all ingredients by 0.333. Challenge: fractional eggs. Solution: beat the egg and use the proportional amount (1 egg beaten × 0.333 = about 1 tablespoon of beaten egg). Or round to 1 egg and adjust liquid slightly.
Cooking time rarely scales proportionally. More food in the same pot reaches boiling point at similar times. Baking: same size pan = same time. Larger pan = different depth = adjust time. Roasting more meat: check internal temperature, not time. The key rule: always check doneness with appropriate tools (thermometer, toothpick, texture test) rather than relying on scaled time.
Professional kitchens use baker percentages and weight-based scaling rather than volume measurements. They express all ingredients as a percentage of the main ingredient (flour for baking, protein for entrees). Weight measurements are more accurate than volume at large scale. They also test-scale recipes in batches before full production.