Recipe Converter: Scale, Double & Halve Any Recipe

Our free recipe converter scales any recipe up or down in seconds – just set your original and desired servings and every ingredient is recalculated for you. Use the recipe converter below, then read on for the simple method and a handy conversion chart.

In summary: To convert a recipe, divide your desired servings by the original servings to get a scale factor, then multiply every ingredient by it. Doubling a 4-serving recipe to 8 uses a factor of 2.

How to use the recipe converter

  1. Enter the recipe’s original number of servings.
  2. Enter how many servings you want.
  3. Paste your ingredient list, one per line.
  4. Press Scale recipe – every quantity is converted instantly.

Why use a recipe converter?

A recipe converter keeps ingredient ratios identical, so a halved or doubled dish still tastes right. It saves maths, reduces waste and makes cooking for any crowd easy. Go gently on salt, spices and raising agents, and check the cooking time when scaling a long way.

Recipe scaling example

Here is a cake scaled from 4 servings to 8 (2×) and to 2 (0.5×):

Ingredient Original (4) Doubled (8) Halved (2)
Flour 200 g 400 g 100 g
Sugar 150 g 300 g 75 g
Eggs 2 4 1
Butter 100 g 200 g 50 g

Need weights or metric amounts? Use our Cups to Grams converter, and plan the week with the Family Meal Planner. For a full reference, see the recipe conversion chart.

Learn more about ingredient ratios via baker’s percentage.

Frequently asked questions

How do I double a recipe? Multiply every ingredient by 2. The recipe converter does the whole list automatically.

Does converting a recipe change the cooking time? Not directly – cooking time changes far less than quantity, so check food around the original time.

Can I convert to any number of servings? Yes, enter any original and target serving count and every ingredient is recalculated.

Written by Norman

Norman is a full-stack software engineer who builds precise digital tools for real-world kitchen challenges, born from his own struggles converting US recipes to metric mid-bake. When he's not debugging code, he's perfecting sourdough and pastry recipes, turning measurement frustration into foolproof, data-driven baking success.