BAKING NOTE

Scale a recipe by available ingredient weight

To scale a recipe to an ingredient you have, divide the available weight by the weight required in the original recipe. Multiply every ingredient by that ratio. If a recipe needs 120 g butter and you have 90 g, use 0.75× the recipe.

How to use the calculator

1. Enter the complete original recipe in grams, or paste a list with g, kg or mg amounts and review it before replacing the list.
2. Choose On hand and select the ingredient that limits your batch.
3. Enter how many grams of that ingredient you have. Its original recipe amount must be greater than zero.
4. Check every other scaled ingredient against your supplies, then copy or save the result.

For example, choose the butter row that requires 120 g and enter 90 g available. The scale factor is 90 ÷ 120 =0.75. The tool does not substitute butter for oil or another ingredient; it only changes quantities.

A complete arithmetic example

The following list demonstrates scaling and is not a tested recipe. Weights are used throughout; cups and whole-egg counts need to be weighed first.

The original total is 620 g and the scaled total is 465 g. These are the sums of ingredient weights before mixing or baking, not the predicted finished weight. If your recipe includes extra water, glaze or filling, decide which component you are scaling and enter its complete list.

When more than one ingredient is limited

Check the available ÷ required ratio for every ingredient that may run out. The smallest ratio sets the largest batch you can make from those supplies. For example,90 g butter against 120 g required gives 0.75, while 100 g flour against 200 g required gives 0.5. Choose flour as the base:0.5× uses 60 g butter and 100 g flour.

Baking Note calculates from the single ingredient you select. It does not automatically inspect your pantry or choose the smallest ratio across a stock list. Changing only the butter amount in the original recipe would change its proportions; use On hand mode to scale the whole list instead.

Scaling up and measuring small quantities

If you have 180 g butter and the original recipe needs 120 g, the ratio is 1.5. Make sure you also have 1.5 times the other ingredients and suitable pan or batch capacity. Larger batches can need different mixing and baking arrangements.

For a partial egg, weigh the edible portion and use a mixed portion where appropriate for the recipe. Small salt, yeast or leavening quantities may exceed the precision of a kitchen scale after scaling down. The display rounding menu changes what you see, not the full-precision ratio. Review sensitive quantities against your recipe and equipment.

Keep the pan and baking conditions in mind

Scaling down ingredients in the same pan changes batter depth. For a cake where equal batter depth matters, choose a pan with proportionally less base area or use the pan conversion guide. This calculator does not automatically adjust your pan when you choose On hand mode.

For a specific total batter weight, use Total weight instead. For a number of pieces with a known unbaked weight, use Portions. Neither mode predicts baking losses or finished portion weight. See the full scaling guide for these options.

Method and further reading

All examples use proportional arithmetic, not a promise that every recipe behaves identically at any scale. See Vancouver Community College’s recipe scaling worksheet for factor calculations and King Arthur Baking’s recipe reduction guide for practical considerations.

Need a specific pan change? Start with the 8-to-9-inch round pan example. Recipe entries stay in your browser; read how storage and optional analytics work.