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# Why do cups convert to ml (or fl oz) when I turn conversions on?

| **Quick answer:** A **cup** is a _volume_ unit, just like **ml** and **fl oz**. When conversions are enabled, CookBook keeps cup measurements as volumes. Converting a cup straight to grams isn’t reliable because grams measure weight, and the weight inside a cup changes with each ingredient.

# Volume vs weight in a nutshell

* **Volume units:** cup, tablespoon, teaspoon, millilitre, fluid ounce.
* **Weight units:** gram, kilogram, ounce, pound.

One cup of flour and one cup of honey both fill the same space, but one **weighs** far more than the other. That’s why CookBook converts cups to another volume unit by default.

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# Why CookBook doesn’t auto-convert cups → grams

Accurate cup-to-gram values depend on:

* The ingredient itself (flour vs sugar vs butter).
* How it’s prepared (scooped, sifted, packed, grated).

Without that detail, the app could be off by 30 % or more - so we avoid automatic cup → gram swaps.

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# Need cups in grams? Use the built-in Volume-Weight Tool

1. In the ingredient list, look for the **scales icon** next to a cup measure.
2. Tap the icon.
3. The tool shows trusted volume-to-weight results, if we have density data for that ingredient.
4. If your exact item isn’t listed, type a similar ingredient (with roughly the same density) for an estimated conversion.

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# Tip

If you prefer to stay in cups, set **Side menu ☰ → Settings → Conversions → Recipe conversions** to **Do not convert**. Otherwise, cups will keep turning into their equivalent mL or fl oz - exactly how professional recipe software handles volumetric units.