Cooking
Recipe Scaler Calculator
Scale any recipe up or down — enter original and desired servings to get exact ingredient amounts instantly.
Scale factor2×
Ingredients
4
2
1
6
NameOriginalScaled
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How recipe scaling works
Scaling a recipe requires one simple formula applied to every ingredient:
Scaled amount = Original amount × (Desired servings ÷ Original servings)
The ratio Desired ÷ Original is the scale factor. A factor greater than 1 scales up; less than 1 scales down. Apply it uniformly to every ingredient for a consistent result.
Tips for accurate scaling
- Spices & salt: Start at 75% of the calculated amount and add to taste — flavour compounds intensify non-linearly.
- Leavening (baking powder/soda): For large scale-ups (4×+) reduce slightly; excess leavening can make baked goods taste metallic.
- Cook time:Volume increases but surface area doesn't scale proportionally — check doneness early and use a thermometer.
- Pan size: Scale the pan area (π r²), not just the diameter, to maintain similar depth and even baking.
- Eggs: For fractional eggs, use a beaten whole egg and measure by weight (≈ 50 g per large egg) or use the yolk/white separately.
Frequently asked questions
How do I scale a recipe to more servings?
Divide the desired servings by the original servings to get your scale factor, then multiply every ingredient by that number. For example, scaling a 4-serving recipe to 12 servings gives a factor of 3 — so 1 cup of flour becomes 3 cups.
Does scaling a recipe always work perfectly?
Scaling works well for most ingredients, but a few things need care. Spices and salt often don't scale linearly — start with 75% of the scaled amount and adjust to taste. Leavening agents like baking powder may also need slight adjustment for large scale-ups.
Can I scale a recipe down to fewer servings?
Yes. Enter a smaller desired serving count and the calculator applies a fractional multiplier. For example, halving a 4-serving recipe sets a 0.5× factor — 2 cups of flour becomes 1 cup.
How do I handle pan sizes when scaling?
Pan sizes scale by area, not linearly. If you double a recipe, use a pan with roughly double the area. A 9-inch round pan has about 64 sq in, so two of them approximate doubling an 8-inch pan (50 sq in). Baking time may also need to be adjusted.
What does the scale factor number mean?
The scale factor is simply desired servings ÷ original servings. A factor of 2× means every ingredient doubles. A factor of 0.5× means every ingredient is halved. You can apply this multiplier to any ingredient not listed in the calculator.