Cooking oils — vegetable, olive, canola, sunflower — all have densities around 0.92 g/ml. This means 100 grams of oil fills approximately 109 ml. Oil is lighter than water, which is why it floats on top.
The density is consistent across most cooking oils, so you can use 0.92 g/ml as a reliable conversion factor for any vegetable-based oil. Coconut oil (solid at room temperature) is slightly different. For all conversions, use our gram to ml converter.