Scaling a recipe by hand, one ingredient at a time, is where arithmetic mistakes creep in. This scales a whole ingredient list at once.
How it works
Scaling factor
scaled amount = original amount × (target servings ÷ original servings)
What scaling can’t do for you
Doubling a recipe’s ingredients does not mean doubling its cooking time, its pan size, or the amount of spice that tastes right. Cooking time depends on heat penetration — related to thickness and volume, not a simple ratio to the ingredient list. Seasoning is famously not linear at all, which is why experienced cooks taste and adjust a scaled-up dish rather than trusting strict proportion. This calculator scales the ingredient list correctly and stops there.
How to use this calculator
- Enter each ingredient as an amount followed by its name, one per line.
- Enter how many servings the recipe currently makes, and how many you want.
- Read the scaled amounts.
Frequently asked questions
Does this handle fractions like 1/2 or 3/4?
Yes — enter a simple fraction directly, like “1/2 cup butter”, alongside decimals.
Should I scale the pan size too?
Pan area doesn’t scale the same way ingredient quantity does — a pan twice the area doesn’t necessarily give the same result as doubling the recipe in the same pan, since baking time and browning depend on the batter’s depth, not just its total volume.
Why doesn’t this adjust cooking time automatically?
Because cooking time depends on how heat penetrates the food, which relates to thickness and shape rather than to total quantity in a simple, calculable way — there’s no reliable formula to scale it by, unlike a straightforward ingredient ratio.
What about leavening agents like baking soda or yeast?
These often don’t scale perfectly linearly at very large or very small batch sizes — a small deviation from strict proportion is sometimes intentional in professional baking. For home-scale adjustments (halving, doubling, or similar), linear scaling is generally a reasonable starting point.
Can I scale down to less than one serving?
Yes — enter a target serving count smaller than one if you want, for instance, a single portion from a recipe that makes several.
