Pantry Staples
Vegetable Oil Conversion
Vegetable Oil weighs 218g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 218.0 g | 7.69 oz |
| 1/2 cup | 109.0 g | 3.84 oz |
| 1/4 cup | 54.5 g | 1.92 oz |
| 1 tbsp | 13.6 g | 0.48 oz |
| 1 tsp | 4.5 g | 0.16 oz |
| 100 g | 100.0 g | 3.53 oz |
Need a different amount? Use the full Ingredient Converter tool.
Vegetable oil's 218g per cup is lighter than water (which weighs about 236g per cup, matching its milliliter volume almost exactly) — a good general reminder that oils and fats are consistently LESS dense than water-based liquids, floating on top of water for the same reason.
This conversion applies to standard, neutral vegetable oil blends (commonly soybean or a mixed-seed-oil blend) — it's close enough to other neutral cooking oils like canola that the figure is a reliable stand-in for most neutral-oil recipe conversions, though it's not identical to olive oil, which has a slightly different, marginally lower density (216g/cup).
Unlike solid fats like butter, vegetable oil is 100% fat with no water content, which is exactly why oil and melted butter aren't a perfect 1:1 substitute for each other despite similar weight — butter's roughly 80% fat, 20% water-and-milk-solids composition adds moisture a pure oil doesn't, changing a baked good's final texture even at an equal weight substitution.
At 218g per cup, vegetable oil sits noticeably lighter than water (236.6g/cup) because fat is inherently less dense than water — this same relationship holds across nearly every cooking oil, which is why a recipe substituting melted butter (227g/cup, partly water) for vegetable oil isn't quite a neutral, weight-equivalent swap even though both are liquid fats measured by the same cup.
"Vegetable oil" as a supermarket label most often refers to a blend, commonly soybean oil, chosen for its neutral flavor and high smoke point — its density and behavior are close enough to other neutral oils (canola, sunflower) that most baking recipes treat them as interchangeable, unlike a strongly flavored oil such as olive or sesame.
Its neutral flavor is exactly why baking recipes prefer it over olive oil when the goal is moisture without introducing a competing taste.
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Frequently asked questions
Is vegetable oil the same weight as canola oil?
Close enough for practical recipe conversion purposes — both are neutral, mostly triglyceride-based oils with very similar densities; this figure works as a reliable stand-in for either.
Why does oil weigh less than water per cup?
Fat is inherently less dense than water — it's the same reason oil floats on top of water rather than mixing into it, and it's a pattern that holds across nearly every oil and fat on this site, not just vegetable oil specifically.
If I substitute melted butter for oil by weight, will the recipe turn out the same?
Close, but not identical — butter contains about 20% water and milk solids that pure oil doesn't have, so an equal-weight swap adds a bit of extra moisture and a different flavor profile, generally making baked goods slightly denser than the oil version.
Is there a meaningful weight difference between brands of vegetable oil?
Not meaningfully for kitchen purposes — commercial vegetable oils are refined to a consistent density regardless of brand, so this figure applies broadly rather than varying bottle to bottle.
Is this conversion figure affected by whether the oil is cold-pressed or refined?
Not meaningfully — the refining process changes flavor, smoke point, and clarity far more than it changes density, so this figure applies reasonably well to both refined and cold-pressed neutral oils.