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CALCULATORS

Recipe Scaler

Multiply or divide recipe quantities by entering original and target servings. Converts decimals to kitchen fractions and flags partial whole items.

Tool statusRuns in your browser
Preview
prontouso://kitchen/recipe-scalerSERVINGS → INGREDIENTS

Adjust servings

Set the original recipe and how many people you're cooking for.

01 / INPUT
SCALE FACTOR2×
Ingredients

One ingredient per line. Headings like "For the sauce:" can sit in the middle of the list.

Kitchen fractionsShows 0.5 as ½ and 0.75 as ¾ when possible.
Flag whole items that become fractionalHighlights results like 1.5 eggs for a manual check.
No recipe is sent anywhere

Scaled recipe

Compare the amounts before copying.

02 / OUTPUT
4 → 8 SERVINGSAUTOMATIC SCALING
RECIPE MULTIPLIER
2×

Every recognized quantity is multiplied by 2×. Units, names, and notes stay exactly as you wrote them.

6 QUANTITIES ADJUSTEDNO ALERTS
Ingredient by ingredientORIGINAL → SCALED
01
Dough:
02
200g flour
400g flour
03
1.5 cups milk
3 cups milk
04
2 eggs
4 eggs
05
0.5 cup butter
1 cup butter
07
Topping:
08
1/2 cup sugar
1 cup sugar
09
1 pinch of salt
2 pinch of salt
10
cinnamon to taste
cinnamon to taste
Points to reviewWE DON'T CHANGE THESE ON OUR OWN
01
Lines with no quantity stayed the same

1 line wasn't changed.

How the calculation worksNO UNIT CONVERSION
DESIRED8
ORIGINAL4
FACTOR2×

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Recipe Scaler?

The Recipe Scaler automatically recalculates ingredient quantities when scaling from an original serving count to a target serving count.

UNDERSTAND THE TOOL

How to scale recipe servings and interpret scaled quantities

Learn how the tool calculates the scaling factor, how to format your ingredient list, how kitchen fraction snapping works, and how to handle fractional whole items.

Ingredient line formatting rule

Write one ingredient per line starting with its numerical quantity. The tool recognizes whole numbers, decimals (with dot or comma), and fractions like 1/2 or 1 1/2. Measurement units and ingredient names remain unchanged.

Kitchen fraction conversion

When enabled, kitchen fraction conversion snaps calculated decimals to standard culinary fraction symbols (such as ½, ⅓, ¼, ¾, or ⅛), making scaled quantities easier to measure with standard cups and spoons.

Review alerts for whole items (eggs, cloves, cans)

Countable ingredients that yield non-whole values (such as 1.5 eggs or 2.3 garlic cloves) trigger a visual review badge so the cook can decide whether to round quantities or measure by weight.

Preservation of section headings

Lines without a leading quantity or ending with a colon (such as 'For the frosting:') are identified as section headers or notes and passed through without alteration.

Practical scaling example

Factor
target_servings / original_servings

Scaling from 4 to 6 servings (1.5x factor)

In a 4-serving recipe scaled to 6, 2 cups flour becomes 3 cups, 1/2 tsp salt becomes ¾ tsp, and 3 eggs triggers a review alert for 4.5 eggs.

factor = 6 / 4 = 1.5x

Local calculation and privacy

All math and text processing runs 100% inside your browser. Your recipes and ingredients are never sent to any server or stored anywhere.

Frequently Asked Questions

How does the tool calculate the recipe scaling factor?

The scaling factor is calculated by dividing target servings by original servings. Scaling from 4 to 8 servings yields a factor of 2x, doubling all ingredient quantities.

Does the tool understand typed fractions like 1/2 or 1 1/2?

Yes. The tool parses simple fractions (1/2), mixed numbers (1 1/2), and Unicode fraction symbols (½), accurately converting them to compute scaled quantities.

What should I do when a scaled recipe calls for partial eggs (e.g. 1.5 eggs)?

The tool flags whole items with a review warning. You can whisk an egg and use half its volume by weight, or round up/down based on whether your recipe needs structure or moisture.

Why wasn't a section header (e.g. 'For the frosting:') changed?

Lines with no leading number or ending with a colon are recognized as category headers and kept intact to preserve your recipe layout.

Can I use commas instead of dots for decimal quantities?

Yes. The tool detects comma decimal notation (e.g. 1,5) and preserves the comma separator in the output.

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