Oil Volume to Weight Converter

All oils are lighter than water, which is why they float. Water has a density of exactly 1.000 g/ml (by definition, at 4°C), while cooking oils sit between about 0.88 and 0.93 g/ml. That gap matters more than most people realize.

Why Oil Density Matters in Cooking: When a recipe calls for “1 cup of olive oil,” most people assume it weighs roughly what a cup of water does, about 237 g. It does not. A US cup of olive oil comes to 216 g, nearly 9% less. For everyday cooking that difference is irrelevant. For precision baking, or for anyone counting fat grams off a nutrition label, it is not, because labels report fat in grams and your measuring cup reports millilitres.

The Density Formula: Mass (g) = Volume (ml) × Density (g/ml)

Volume conversions:

• 1 fluid oz = 29.5735 ml
• 1 US cup = 236.588 ml
• 1 US gallon = 3,785.41 ml
• 1 liter = 1,000 ml

Cooking Oil Density Reference:

Why Coconut Oil Appears Twice in That Table: Coconut oil changes phase at about 76°F (24°C). Below that it is a white solid at roughly 0.925 g/ml. Above it the oil melts and drops to about 0.904. The dropdown carries both, so pick the one matching the jar in front of you. A cup of the solid outweighs a cup of the melted by around 5 g, which is small but real if you are scaling a recipe up.

Petroleum Context: API Gravity: The petroleum industry does not use density directly. Instead they use API Gravity, a scale developed by the American Petroleum Institute: API = (141.5 / Specific Gravity) − 131.5

Where Specific Gravity is the density relative to water. Higher API = lighter oil.

• Gasoline: API ≈ 60 (SG ≈ 0.737)
• Crude oil: API ≈ 30–40 (SG ≈ 0.825–0.876)
• Heavy crude: API < 22 (SG > 0.922)
• Water: API = 10 (SG = 1.000)

Industrial Shipping Context: Tanker ships and pipeline operators need precise density data because oil is bought and sold by mass (metric tons) but physically measured by volume (cubic meters or barrels). A 1% error in density means a 1% error in the financial transaction. Custody transfer measurements use certified density meters and temperature correction.

Temperature Effect on Density: Oil thins as it warms, losing roughly 0.00065 g/ml for every degree Celsius. Olive oil at 20°C is 0.911 g/ml, and at 60°C (140°F) it has dropped about 0.026 to 0.885 g/ml. Pour hot oil into a measuring cup and it shrinks as it cools, so a cup measured warm is short by a few percent once it reaches room temperature. Deep frying is where this actually bites, since the same liter in the fryer occupies noticeably more space at 180°C than it did in the bottle. For ordinary baking, ignore it.

Worked Example: Baking Precision: A cake recipe calls for 200 ml of olive oil. Weight = 200 × 0.911 = 182.2 g Assume water density instead and you get 200 × 1.0 = 200 g, an error of nearly 18 g of fat. That is a tablespoon and a half. In a delicate pastry, or in a calorie-controlled recipe, it shows.