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Recipe Scaler: Scale Ingredients for More or Fewer Servings

This free recipe scaler multiplies every quantity in an ingredient list by the factor you need. Give the original and wanted servings, and fractions such as 1/2 and 1 1/2 are read and written back in kitchen-friendly form.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

A recipe for four rarely suits six. Doing the sums for each ingredient in your head is slow and easy to get wrong, especially with fractions.

Paste the ingredient list, enter the servings and copy the scaled list.

How to Use This Tool

  1. Paste one ingredient per line.
  2. Enter the original and the wanted servings.
  3. Press Scale.
  4. Copy the new list.

How the Calculation Works

The factor is wanted ÷ original. At the start of each line, the tool reads a whole number, a fraction, a mixed number or a decimal, multiplies it by the factor and writes it back as a mixed fraction when it is close to a multiple of one eighth, otherwise as a decimal. The rest of the line is kept as written.

Worked Example

Scaling 4 servings to 6 gives a factor of 1.5. 2 cups flour becomes 3 cups flour, 1/2 tsp salt becomes 3/4 tsp salt and 1 1/2 cups milk becomes 2 1/4 cups milk.

Common Uses

  • Cooking for guests.
  • Meal prep batches.
  • Halving a recipe.
  • Converting a recipe to the pan you have.

Tips and Common Mistakes

  • Scale seasoning gently and taste as you go.
  • Check baking times when you change the batch size.
  • Weigh ingredients for the best results.

Next, you may need the cups to grams converter, baker’s percentage calculator, electricity cost calculator, gravel and mulch calculator.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

Each number at the start of a line is multiplied by wanted servings divided by original servings.
Yes. 1/2, 1 1/2 and decimals such as 0.75 are understood, and results are shown as fractions where sensible.
Not for everything. Baking times, pan sizes, spices and leavening do not always scale in a straight line, so use judgment for big changes.
Whole eggs cannot be split, so the tool shows the exact number and you round to a sensible amount.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.