The published peanut-butter references do not specify every product detail. Smooth or chunky texture, oil separation, and composition remain relevant limitations rather than hidden assumptions.
Read the available reference
King Arthur supplies a source-cup relationship. Women’s Weekly Food supplies a level 250 mL cup relationship. Keep these separate and choose the one whose stated scope best fits the recipe.
A defined cup volume does not establish that every peanut-butter product fills or weighs the same. Read the limitation before treating a result as a practical amount.
Document a product-specific measurement
If texture or separation matters, use an original weight or document a measurement of your own prepared product. Record the product description and method with the known volume and mass.
Keep any instruction to stir the product with the row. A custom measurement describes the product and preparation you measured; it should not replace the public reference for everyone.
Keep peanut butter as its own ingredient
Whole peanuts, peanut flour, and another nut butter are separate ingredient identities. The converter does not provide a substitution ratio between them.
When combining recipes for shopping, retain the texture or product preference in the note so a single total still tells you what to buy.