Vegetable oil grams to cups
To convert grams to cups, divide the grams by 218. For example, 100 g of vegetable oil ≈ 0.46 cup.
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Vegetable oil is a liquid, so a recipe could just give you a cup measure, but weighing in grams removes the meniscus guesswork and the film clinging to the jug. One US cup of vegetable oil is about 218 grams. Here's how to convert cleanly.
Vegetable oil grams to cups chart (US cup)
| Grams | Cups (approx.) | Decimal cups |
|---|---|---|
| 25 g | ⅛ cup | 0.11 |
| 50 g | ¼ cup | 0.23 |
| 75 g | ⅓ cup | 0.34 |
| 100 g | 0.46 cup | 0.46 |
| 125 g | 0.57 cup | 0.57 |
| 150 g | ⅔ cup | 0.69 |
| 175 g | 0.8 cup | 0.8 |
| 200 g | 0.92 cup | 0.92 |
| 250 g | 1⅛ cups | 1.15 |
| 300 g | 1.38 cups | 1.38 |
| 400 g | 1.83 cups | 1.83 |
| 500 g | 2.29 cups | 2.29 |
Why vegetable oil weighs what it does
Vegetable oil weighs less than water per cup because oil is lighter than water, with a density near 0.92 g/ml, so a full US cup lands around 218 grams rather than 236. "Vegetable oil" is usually a soy, canola, sunflower, or blended base, and those differ only slightly in weight, so brand variation here is minor compared with flour or sugar. Temperature matters a little: warm oil is marginally less dense than cold, but for baking the difference is negligible. Unlike honey or syrup, oil pours and levels instantly, so the weight is very repeatable.
How to measure vegetable oil
Weigh oil straight into the bowl on a tared scale rather than fighting a measuring cup, where oil films the sides and you lose a teaspoon or two to the jug. If you must use a cup, fill to the line at eye level and scrape it out with a spatula. For 218 g, pour slowly and stop when the scale reads it.
Common mistake
Assuming a cup of oil weighs the same as a cup of water (236 g) and over-adding by nearly 20 grams. Oil is lighter, so a cup is about 218 g. The other slip is leaving oil-coated measuring cups uncounted, shorting the batter by the film left behind.
Other cup sizes
| Cup type | 1 cup of vegetable oil |
|---|---|
| US cup (240 ml) | 218 g |
| Metric cup (250 ml) | 227 g |
| Australian / South African cup (250 ml) | 227 g |
| Imperial cup (284 ml) | 258 g |
Where it matters
Oil-based cakes, muffins, quick breads, brownies, and carrot cake rely on vegetable oil for a moist, tender crumb that stays soft cold, unlike butter cakes. Getting the amount right matters because excess oil makes batter greasy and dense, while too little dries the crumb. Salad dressings and marinades are more forgiving.
FAQ
Why does a cup of vegetable oil weigh less than a cup of water?
Oil is less dense than water (roughly 0.92 g/ml versus 1.0), so the same volume weighs less. A US cup of oil is about 218 g, while a cup of water is about 236 g.
Can I swap vegetable oil for melted butter by weight?
Roughly, but not perfectly. Butter is about 80% fat and 16% water, so swapping gram-for-gram adds less pure fat and a little water. For a 1:1 swap, weight is a closer match than volume, but expect a slightly different crumb.
Is the weight the same for canola, sunflower, or olive oil?
Nearly. Most common cooking oils sit between 215 and 224 g per US cup because their densities are all close to 0.91 to 0.92 g/ml. For baking purposes 218 g per cup is a safe figure across vegetable oils.
Does measuring oil by weight really help if it's a liquid?
Yes. Weighing avoids the film oil leaves on measuring cups and the eye-level error of reading a meniscus, so your fat content is more consistent batch to batch.