Recipe Scaler & Ingredient Converter — Adjust Any Recipe

The Formula

The scale factor is the ratio of desired servings to original servings. Each ingredient quantity is multiplied by this factor to get the scaled amount needed. Fraction inputs like "1/2" and "2 1/2" are automatically parsed into decimal values before scaling.

Variable Definitions

How to Use This Calculator

1. 1

   Enter the number of servings the original recipe makes.

2. 2

   Enter the number of servings you want to make.

3. 3

   Add your ingredients: name, quantity (supports fractions like "1/2" or "2 1/2"), and unit.

4. 4

   Add up to 3 ingredients. Only the first ingredient is required.

5. 5

   View the scaled quantities instantly for each ingredient.

Common Applications

• Scaling a family recipe up for a large gathering or party by entering the desired number of servings
• Halving or quartering a recipe when cooking for fewer people without doing mental fraction math
• Converting ingredient quantities that use fractions (like "1/2" or "2 1/3") to accurate scaled amounts
• Planning meal prep by calculating exact ingredient amounts when batch-cooking a recipe

Scale factor = desired servings ÷ original servings. Each ingredient is multiplied by the factor to keep proportions identical.

Understanding the Concept

Scaling recipes is a common kitchen challenge whether you are cooking for a crowd, halving a family recipe, or adjusting serving sizes for meal prep. The math is straightforward: divide your desired number of servings by the original number of servings to get a scale factor, then multiply each ingredient quantity by that factor. However, not all ingredients scale linearly in practice. Salt, spices, and leavening agents (baking soda, baking powder, yeast) often need careful adjustment because they affect chemical reactions in baking. Doubling the salt might make a dish inedibly salty, while doubling baking powder could cause a cake to rise too rapidly and collapse. For best results, scale aromatic spices and salt by about 1.5x when doubling a recipe instead of 2x, and adjust to taste. Liquids also require attention because evaporation rates change with larger volumes. When scaling up a soup or sauce, you may need slightly less additional liquid than the math suggests, then thin it out as needed. For scaling down, be mindful of pan sizes: halving a recipe designed for a 9x13 pan may work better in an 8x8 pan, and cooking times will likely decrease. Egg quantities can be tricky when scaling down since you cannot easily use half an egg. Beat the egg and measure out half by volume, or use a small egg as a substitute. This calculator handles the arithmetic so you can focus on cooking adjustments, but always use your judgment for ingredients that behave non-linearly when scaled.

Frequently Asked Questions

Sources & References