How much does frying oil weigh?

  • By: Emma
  • Date: May 19, 2022
  • Time to read: 5 min.

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How much does frying oil weigh?

It’s a common question when cooking at home- How much does frying oil weigh?  This post will attempt to answer this question by describing how it is calculated and how much it usually weighs.

Usually, frying oil will weigh around 7.5 pounds for every gallon. This means that if you have a cup of oil, the weight would be around 3 ounces.

Now that we’ve established how much frying oil weighs let’s look at how it is calculated and measured.

3 Methods to measure the frying oil weight

There are three different methods for figuring out how much something weighs, and they can be used in tandem with one another.

– The first method involves multiplying the weight by gravity (9.8m/s2) times the height you dropped an object from.

– The second method uses the Archimedes principle, which states that buoyant objects displace their own weight in water; therefore, if your object floats on the water, then the volume of water displaced equals its weight (the density of water = 1000kg/m3).

Finally, another way to measure how much frying oil weighs is to see if it sinks or floats. If the object sinks, its weight would be equal to its volume; therefore, the volume is equal to the weight divided by the density.

Factors that affect the weight of frying oil

Many factors affect the weight of frying oil. Although these factors don’t alter the weight too much, they make a difference.

Heated vs. non-heated oil

The more the oil is heated, the lighter it gets. When you heat oil for frying, it will become less dense, and as a result, you need less oil for the same amount of food. Let’s take an example to understand this better.

If you drop a liter of oil at room temperature, then it would weigh around 7.5 pounds, but if you heat that same liter until its boiling point, then its weight would reduce to 6.25 pounds, meaning the density decreased by 0.5 * 9.8m/s2 = 4.9 kg/m3

Room temperature

It is as simple as the above-mentioned one. If the temperature room/ climate is above 30-40 degrees C, the oil will be lighter.

Container volume

The more volume a container has, the denser its contents become. A larger volume means that an object would have to occupy a greater percentage of the total space to fill up all of it eventually.

For example, if you place a liter of water inside a bucket, it would only occupy 1/4 of its volume (considering that it is filled and not floating in the air). However, if you place 8 liters of water, it would occupy around 3/4th of the bucket.

Atmospheric pressure

Apart from temperature and heat, another factor that affects the weight of frying oil is pressure. If you are frying at high altitudes, your oil would be lighter due to lower air pressure. Similarly, if you are at the bottom of the sea, your oil would be heavier due to increased pressure.

However, if this difference is less than 20%, it doesn’t make much difference. However, if it affects more than that, you should use different amounts for cooking.

Fresh vs. used oil

When you fry something at a restaurant, the oil used for that is generally disposed of, and a fresh batch is used. After frying a certain type of food, the oil gets contaminated with flavors from it. This increases the weight of frying oil.

The levels of contamination range from slight to very high depending on how much was fried in the oil before. Old oils tend to have fewer flavors than fresh ones.

Type of oil

This one is an obvious factor. Different oils have different densities and viscosities. For example, at 20 degrees C, olive oil has a density of 0.913g/ml while peanut oil stands at around 0.918g/ml.

Another case is with soybean oil, which is less dense than most other oils. It is usually used for frying tortilla chips and such foods without absorbing too much fat, making it healthier.

As per the research data of various oils densities, the lightest oil is olive oil, whereas the heaviest oil is coconut oil. The weight of the different types of oils (in grams) is shown below:

Unsaturated fats- 0.919g/ml

Olive oil- 0.913g/ml

Vegetable oil- 0.929g /

Peanut oil- 0.918g/ml

Corn oil- 0.920g/ml

Soybean oil- 0.925g/ml

Sunflower oil- 0.926g/ml

Rapeseed (canola) oil- 0.930g/ml

But there is more to consider than just weight when measuring the quantity of frying oil needed for cooking food; therefore, it is better to check out the brand and ye of oil you are choosing for frying purposes.

Can the weight of frying oil affect my health?

Absolutely yes! If you use heavy oils for frying, you are adding more weight to your body and the food. This can cause different problems in the future.

Remember, it’s the quantity of the oil that should also be considered here. The more oil you take while eating fried foods, the heavier your body will feel and thus the less healthy you get.

Which frying oil is the lightest?

The lightest frying oil is olive oil. This is because this oil has the lowest levels of saturated fats highest levels of mono-saturated fats, and it is cholesterol-free.

Which frying oil is the heaviest?

The heaviest frying oil is coconut oil because it contains high saturated fats and other trans-fats, which are generally hard to digest.

Does the weight of frying oil affect its taste?

Yes, absolutely! Due to the different densities of the various oils, their tastes also vary. For instance, if you fry food using olive oil, it would have a different taste compared to fried in peanut oil. This is mostly because of the difference in boiling points and acidity levels of these oils.


In summary, an average oil weighs around 3 ounces per cup. You need to be careful while choosing the oil for frying. If you love fried food, then choose a lighter oil for frying, but make sure that your intake of the same is reduced.

Because you are what you EAT!

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