Recipe Scaler Calculator

Scale any recipe up or down by servings.

Original servings

Servings the recipe is written for.

Desired servings

Ingredient amount(optional)

Optional — enter one quantity to see its scaled amount.

Results update as you type.

Scale factor

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Scaled ingredient amount—

How it works

Scaling a recipe up for a crowd or down for a couple comes down to one number, and this recipe scaler calculator finds it for you and applies it to any ingredient you enter. You supply the servings the recipe was written for and the servings you actually want, and the tool returns the exact scaling factor along with the resized amount of whichever ingredient you type in. Getting the factor right matters because eyeballing a doubled or halved recipe is where mistakes creep in, especially with awkward numbers like taking a recipe for four up to seven. A recipe scaler calculator removes the mental arithmetic so every quantity stays in the same proportion, keeping the balance of the dish intact whether you are batch-cooking for a party or shrinking a family favourite for a solo dinner. The factor works because a recipe is really a set of ratios, and multiplying them all by the same number preserves those ratios at any size. A couple of things do not scale linearly, though: salt, strong spices, and leavening often need a lighter touch when multiplied, and cooking time shifts with pan depth rather than volume. Home cooks, caterers, and meal-preppers all lean on a recipe scaler calculator to resize dishes quickly and taste-check the seasoning afterwards.

Formula

scale factor = desired servings ÷ original servings

Scaling a recipe means keeping every ingredient in the same proportion while changing the total yield. Dividing the desired servings by the original servings gives one factor that every quantity is multiplied by, so ratios stay intact. The method works because a recipe is a set of fixed proportions, and multiplying them all by the same number preserves those proportions at any batch size.

Source:Standard cooking conversions

We review all our tools from time to time to ensure accuracy.

Worked example

Original servings:4Desired servings:6Ingredient amount:2

6 ÷ 4 = 1.5× scale factor, so 2 cups becomes 2 × 1.5 = 3 cups.

How to use this calculator

1
Enter your values
Enter original servings and desired servings.
2
Adjust the options
Adjust ingredient amount if they apply — sensible defaults are already set.
3
Read your result
Scale factor updates instantly as you type — no button to press.

Frequently asked questions

How does the recipe scaler calculate the factor?

The tool divides your desired number of servings by the original number of servings the recipe was written for. That single figure is the scale factor, and multiplying any ingredient by it gives the new amount. Taking a recipe for four up to six produces a factor of 1.5, so every quantity grows by half again. The factor keeps all ingredient ratios perfectly in proportion at the new yield.

Do I have to enter an ingredient amount?

No, the ingredient field is optional. If you only want the scale factor, leave it blank and the calculator still returns the multiplier to apply yourself. Entering one quantity is handy when you want to check a specific ingredient, such as how many grams of flour a doubled batch needs. You can re-enter different amounts one at a time to convert each line of a recipe in turn.

Does seasoning scale the same way as other ingredients?

Not always. Bulk ingredients like flour, sugar, and liquid scale cleanly with the factor, but salt, strong spices, garlic, and chilli often taste too intense when multiplied straight. A safe habit is to scale them to about three-quarters of the factor, then taste and adjust. Leavening agents such as baking powder can also behave differently in larger batches, so treat those numbers as a starting point rather than a rule.

Why doesn't cooking time scale with the recipe?

Cooking time depends on how heat penetrates the food, which is governed by thickness and surface area, not total volume. A doubled cake batter in a deeper tin needs longer, while the same batter spread across two tins bakes in roughly the original time. Because of this, keep an eye on doneness cues — colour, internal temperature, a clean skewer — instead of assuming the time scales by the same factor.

Can I scale a recipe down to a single serving?

Yes. Enter the original servings and set the desired servings to one, and the calculator produces a fractional factor to shrink every ingredient. Very small amounts can become hard to measure accurately, so lean on a kitchen scale and measuring spoons for tiny quantities. For ingredients like a single egg that cannot be neatly divided, round sensibly and adjust the surrounding quantities to keep the dish balanced.