How Much Does a Gallon of Crude Oil Weight? [Weight Chart]


The standard weight of crude oil is 6.3-8.4 pounds per gallon, with an average of 7.2. This means that you can expect the weight of one barrel (42 gal.) of crude oil to be in the range of 265-353 pounds, with an average weight of 300 pounds.

If you want to find out more about the weight of different crude oils and compare them in one chart, this post is for you.

We at PowerSportsGuide have compiled all you need to know under one roof!

What is Crude Oil?

Crude oil is a fossil fuel formed from hydrocarbon deposits and other materials. These organic materials are derived from plants and animals that lived in the oceans millions of years ago.

In the many millions of years that have passed, these deposits were buried by sediment like rocks and sand. The pressure and heat converted these deposits into petroleum and crude oil.

Crude oil is processed by refining it to produce fuels like diesel, gasoline, and a wide variety of petrochemicals.

What Are the 4 Main Types of Crude Oil?

Simply put, the four main types of crude oil are as follows:

  • Extra Light Crude Oil
  • Light Crude Oil
  • Medium Crude Oil
  • Heavy Crude Oil (and extra-heavy oil)

Crude oils with very high (45-55) API gravity are often considered extra light or super light crude oils.

Light crude oil comes with a hefty price tag since it can be turned into gasoline and diesel fuel. The API gravity of light crude oil is about 25-45 API.

Medium or “middle” crude oil is the most common type of crude oil, and has an API gravity of 25-35.

As the name suggests, you can find the densest crude oils in the “heavy” class. These oils cost less as they require a more thorough refining process. Also, they produce fewer usable products than lighter oils.

The API gravity of heavy crude oils is about 15-25 API, but below 15, the oil is considered extra heavy.

What is the Weight of Crude Oil?

As a rule of thumb, the average crude oil weighs about 7.21 pounds per gallon, which means you can expect the weight of one barrel (42 gallons) of crude oil to be about 300 pounds.

However, as we’ve discussed, the density of crude oils depends on their API gravity. The API gravity is a measure that tells how heavy crude oil is compared to water.

The general rule is that the API gravity of most crude oils falls into the range of 15-45 API. Anything above 45 API would be considered an extra-light oil, and below 15 API, you can find the extra-heavy oils.

The formula of API gravity is as follows:

API = (141.5/SG) -131.5

Rearranging this formula helps to calculate specific gravity (SG) from API gravity.

SG = 141.5 / (API+131.5)    

The SG (specific gravity) refers to the density of the crude oil, which can be turned into pounds-per- gallon figures.

Based on our research, the average API and weight-per-gallon figures of the different crude oil categories are as follows:

  • Extra light crude oil (API 45-55): 6.3 – 6.7 pounds per gallon
  • Light crude oil (API 35-45): 6.7 – 7.1 pounds per gallon
  • Medium crude oil (API 25-35): 7.1 – 7.6 pounds per gallon
  • Heavy crude oil (API 15-25): 7.6 – 8.1 pounds per gallon
  • Extra heavy crude oil (API 10-15): 8.1 – 8.4 pounds per gallon

Based on that, it’s safe to say that most crude oil weighs about 6.3-8.4 pounds per gallon, which translates to 265-353 pounds per barrel.

Crude Oil Weight Per Gallon Chart

For your convenience, we’ve done the math and listed the most common conversion numbers into these crude oil weight charts:

Crude Oil Weight Chart

Type of OilAPIDensity (g/ml)Density (lbs/gal)
Extra light Crude Oil45-550.76-0.806.3-6.7
Light Crude Oil35-450.80-0.856.7-7.1
Middle Crude Oil25-350.85-0.907.1-7.6
Heavy Crude Oil15-250.90-0.977.6-8.1
Extra heavy crude oil10-150.97-1.08.1-8.4

Crude Oil Weight-Per-Gallon Chart

APIWeight of 1 gallon (lbs)Density (g/ml)
556.330.759
546.370.763
536.400.767
526.440.771
516.470.775
506.510.780
496.540.784
486.580.788
476.620.793
466.650.797
456.690.802
446.730.806
436.770.811
426.810.816
416.850.820
406.890.825
396.930.830
386.970.835
377.010.840
367.050.845
357.090.850
347.140.855
337.180.860
327.220.865
317.270.871
307.310.876
297.360.882
287.400.887
277.450.893
267.500.898
257.550.904
247.590.910
237.640.916
227.690.922
217.740.928
207.790.934
197.850.940
187.900.946
177.950.953
168.010.959
158.060.966
148.120.973
138.170.979
128.230.986
118.290.993
108.351.000

Crude Oil Weight-Per-Barrel Chart

APIWeight of 1 barrel [42 gal.] (lbs)Density (g/ml)
552660.759
542670.763
532690.767
522700.771
512720.775
502730.780
492750.784
482760.788
472780.793
462790.797
452810.802
442830.806
432840.811
422860.816
412880.820
402890.825
392910.830
382930.835
372940.840
362960.845
352980.850
343000.855
333010.860
323030.865
313050.871
303070.876
293090.882
283110.887
273130.893
263150.898
253170.904
243190.910
233210.916
223230.922
213250.928
203270.934
193300.940
183320.946
173340.953
163360.959
153390.966
143410.973
133430.979
123460.986
113480.993
103511.000

Disclaimer: These charts are for informational purposes only! Crude oil weight varies depending on many factors like its API and temperature.

Takeaways – FAQs About Crude oil Weight

As a takeaway, we’ve answered the most common questions on the topic.

What is the density of crude oil in g/mL?

The density of crude oil ranges from about 0.75 g/ml up to almost 1 g/ml, with an average of 0.864 g/ml. It’s safe to say that the density of the majority of crude oils falls into the range of 0.80-0.97 g/ml.

What is the standard unit of measurement for crude oil?

The standard measurement for crude oil is the barrel (a.k.a. “BBL”), equivalent to 42 U.S. gallons.

How much does crude oil weigh per barrel (42 gal.)?

The average crude oil weighs about 300 pounds per barrel (42 gal.), but depending on its API gravity, the weight of one barrel of crude oil can be anywhere from 265-353 pounds.

What is the weight of crude oil per gallon?

The weight of crude oil is about 6.3-8.4 pounds per gallon, depending on its API gravity.

References:

https://www.investopedia.com/terms/c/crude-oil.asp

https://www.eia.gov/energyexplained/oil-and-petroleum-products/

https://www.plainsmanmfg.com/blog/four-main-types-crude-oil/

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