Substituting Butter For Olive Oil
In most recipes, olive oil can be substituted for butter at a 3:4 ratio by volume.
For example, if the recipe calls for 1 cup of butter, you can replace it with 3/4 cups of olive oil.
Since olive oil is a liquid, it’s not a suitable butter replacement in recipes that need the fat to remain solid or that need plenty of creaming, for instance, frosting and angel food cake.
Olive oil’s robust flavor works nicely in recipes that have a fruity, nutty, or savory quality, like pumpkin bread or muffins.
See the chart below for easy conversion-