Converter
Why olive oil needs its own conversion
Olive Oil weighs about 216g per cup — in the middle of the density range for common baking ingredients. USDA olive oil ~216 g/cup (density ~0.91 g/mL). King Arthur lists 1/4 cup = 50 g (~200 g/cup). A cup is a unit of volume, so ingredients this different in density can't share one generic conversion factor — using a single "1 cup = X g" rule for everything will be wrong for at least some of what you cook.
Common measurement mistakes
- Using a generic cup-to-gram factor for every ingredient — olive oil does not weigh the same per cup as most other ingredients.
- Measurement note: USDA olive oil ~216 g/cup (density ~0.91 g/mL). King Arthur lists 1/4 cup = 50 g (~200 g/cup).
- Confusing weight ounces with fluid ounces when a recipe lists "oz" — they are not interchangeable.
Frequently asked questions
How many grams are in a cup of olive oil?
About 216g, uSDA olive oil ~216 g/cup (density ~0.91 g/mL). King Arthur lists 1/4 cup = 50 g (~200 g/cup).
Does this conversion work for every brand or variety of olive oil?
It’s a close approximation based on USDA FoodData Central. Minor variations in moisture, grain, or brand can shift the exact weight slightly, but this figure works well for everyday cooking and baking.