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Recipe Scaler

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Scale any recipe up or down. Paste ingredients, set your target serving count, and get adjusted amounts with smart unit simplification.

Last updated 02 Apr 2026

Paste your recipe, enter the original and target serving counts, and this tool automatically scales all ingredient amounts with smart unit simplification — turning 1.5 tablespoons into 4.5 teaspoons, for example. It also adjusts cooking time non-linearly (doubling a recipe adds ~25% extra bake time, not 100%) and warns when spices are detected, since they rarely scale linearly.

Recipe ingredients

0 ingredients detected

Serving sizes

×2

Cooking time adjustment

Baking time scales non-linearly. Doubling a recipe adds ~25% more time, not 100%.

h
min
37 min

Pan size

Scaled ingredients

OriginalScaledIngredient
Adjusted cooking time37 min

Paste recipe ingredients above to see scaled amounts.

Cooking time adjustments are estimates. Actual times vary by oven, dish material, and recipe type. Always verify doneness with a thermometer or by testing the food.
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How to use

  1. 1

    Paste your recipe ingredients

    Paste the ingredients section of your recipe into the text area. The tool automatically detects ingredient lines and parses quantities and units.

  2. 2

    Set the original serving count

    Enter how many servings the original recipe makes — usually stated at the top of the recipe.

  3. 3

    Enter your target serving count

    Type how many servings you need. The scale factor is calculated automatically and applied to every ingredient.

  4. 4

    Review scaled ingredients

    See every ingredient scaled to your target amount with simplified units. Spice warnings appear for seasonings that rarely scale linearly.

  5. 5

    Adjust cooking time

    Enter the original cooking time. The tool calculates an adjusted time using a non-linear formula — baking time does not double just because you doubled the recipe.

  6. 6

    Copy or print

    Copy the scaled recipe to clipboard with one click, or use the Print button for a clean printable version.

Frequently asked questions

Why does the cooking time not double when I double the recipe?
Oven heat penetrates food non-linearly. A 1kg roast does not take twice as long as a 500g roast. This tool uses a formula based on the 0.3 power of your scale factor — doubling a recipe typically adds about 25% more cooking time, not 100%.
Why are spices flagged with a warning?
Spices and strong seasonings rarely scale linearly. Doubling a recipe with 2 teaspoons of cayenne pepper to 4 teaspoons usually produces an overpowering result. The tool scales detected spices at 75% of the main multiplier and shows a warning so you can taste and adjust.
What fraction and unit formats are supported?
The parser handles standard fractions (1/2, 1/4, 2/3), Unicode fractions, mixed numbers (1 1/2, 2 1/4), and ranges (2-3 cloves). Units include all common US and metric cooking measurements: tsp, tbsp, cup, quart, gallon, ml, l, g, kg, oz, lb, and their full-word variants.
What is the convection oven toggle?
Convection ovens circulate hot air more efficiently, reducing cooking time by about 15% (or allowing a 25°F / 15°C lower temperature). Enabling this toggle applies a 15% time reduction on top of the scaled time.
Why doesn't the tool detect some of my ingredient lines?
The parser skips lines without numbers (section headers like 'FOR THE SAUCE:') and lines that look like instructions. Ensure the quantity comes first on the line — for example '2 cups flour' rather than 'flour, 2 cups'.
Can I scale a recipe down below one serving?
Yes. Set the target servings to a fraction — for example, 0.5 for half a recipe. The parser handles decimal multipliers and simplifies units accordingly.
Does it convert between metric and imperial units?
The tool simplifies within the same unit system (e.g. 6 tsp → 2 tbsp, 1000ml → 1L). Full metric-to-imperial conversion is not applied automatically to preserve the recipe's original style.
Is my recipe data sent to a server?
No. All recipe parsing and scaling happens entirely in your browser. Nothing is uploaded or logged.

Paste a recipe and set your target serving count to scale every ingredient automatically.

The parser handles fractions (including Unicode ½, ¼), mixed numbers (1 1/2), and ranges

(2-3 cloves). Units are simplified intelligently: 0.25 cup stays as 1/4 cup, 6 tsp becomes

2 tbsp. Spice amounts scale at 75% of the main multiplier by default and are flagged with a

warning — because doubling a chilli recipe doesn't mean doubling the cayenne.

The cooking time panel uses a non-linear formula: baking time scales roughly to the 0.3 power

of your scale factor, so doubling a recipe adds about 25% more oven time, not 100%. A convection

oven toggle knocks off 15% and a pan size selector accounts for heat distribution. Copy the scaled

recipe to your clipboard or print it directly. Handles both metric and US imperial cooking units.

No account or installation required.

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