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 |
Opens the converter already set to Vegetable Oil — type any amount, including fractions like 1/2 or 1 1/4, and get grams, ounces, cups, tablespoons, teaspoons and millilitres at once.
The table above covers the amounts recipes ask for most often. For anything else — an odd fraction, an amount in ounces, a gram figure off a scale you want back in cups — the converter works in either direction and shows every unit at once.
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.