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Add subtract calculator for recipes


Calculator Use

To use this tool, for example to resize a recipe, just choose if you want to scale up or down, the quantity of the original unit in your recipe.

This tool accepts decimal, integer, fractional values and mixed numbers as input, so you can type values like: 1, 4, 0.5, 1.9, 1/2, 3 1/2, etc.

The fractions / integers show as results may be an exact value or have an approximation error according to the table below:

Exact 1% 2% 5%10%15%

If the fraction error does not fit your needs, you should use the decimal value and possibly increase the number of significant figures.


Approximation error for fractions / whole numbers

Exact 1% 2% 5%10%15%

A list of abbreviations is at the bottom of this page.


Calculator Use

To use this tool, for example, to add 1 tablespoon to 1/2 cup, simply select tablespoon and cup, input the values then select "plus".

This calculator was designed to help you convert add and subtract customary units of volume for use in recipes, so some of the results, particularly fractions, may be approximate and have a small error, which is color-coded to give you more confidence when using the results.

Exact 1% 2% 5%10%15%

Volume units symbols or abbreviations

Here are all the abbreviations used in this volume resizer.



Despite efforts to provide accurate information on this website, no guarantee of its accuracy is made. Therefore, the content should not be used for decisions regarding health, finances, or property.