1 tablespoon of olive oil is a common cooking measurement that is about the size of a grape. You can see it here next to a us dime, us quarter, and a golf ball.

In kitchen measures
3 teaspoons
3 tsp · 1 tbsp · 0.063 cups
about the size of a grape
Olive oil typically ranges 0.9–0.93 g/mL depending on how it's packed. A firmly packed scoop weighs more.