Understanding US Oil Barrels to Acre-Feet Conversion
The US oil barrel (bbl) is the standard petroleum volume unit equal to 42 US gallons, about 158.987 litres. The acre-foot is a large volume unit equal to the water covering one acre to a depth of one foot, roughly 1,233 cubic metres, used widely in water resource management. Converting between them arises when petroleum-scale volumes are compared against reservoir or irrigation quantities measured in acre-feet.
Conversion Formula
To convert US Oil Barrels to Acre-Feet, multiply by this factor:
Step-by-Step Example
Convert 25 US Oil Barrels to Acre-Feet.
How to Convert US Oil Barrels to Acre-Feet
Compare petroleum-scale volumes with water-resource units by converting barrels to acre-feet.
- Identify the value: Note the volume in US oil barrels (bbl).
- Apply the factor: Multiply by 0.0001288931, the number of acre-feet in one barrel.
- Expect a small number: Because an acre-foot is huge, the result is a small fraction unless you have thousands of barrels.
- Worked result: For 25 bbl, acre-feet.
US Oil Barrels to Acre-Feet conversion table
| US Oil Barrels (bbl) | Acre-Feet (acre-foot) |
|---|---|
| 0 | 0 |
| 1 | 0.0001288931 |
| 2 | 0.0002577862 |
| 3 | 0.0003866793 |
| 4 | 0.0005155724 |
| 5 | 0.0006444655 |
| 6 | 0.0007733586 |
| 7 | 0.0009022517 |
| 8 | 0.001031145 |
| 9 | 0.001160038 |
| 10 | 0.001288931 |
| 15 | 0.001933396 |
| 20 | 0.002577862 |
| 25 | 0.003222327 |
| 30 | 0.003866793 |
| 40 | 0.005155724 |
| 50 | 0.006444655 |
| 60 | 0.007733586 |
| 70 | 0.009022517 |
| 80 | 0.01031145 |
| 90 | 0.01160038 |
| 100 | 0.01288931 |
| 150 | 0.01933396 |
| 200 | 0.02577862 |
| 250 | 0.03222327 |
| 300 | 0.03866793 |
| 400 | 0.05155724 |
| 500 | 0.06444655 |
| 600 | 0.07733586 |
| 700 | 0.09022517 |
| 800 | 0.1031145 |
| 900 | 0.1160038 |
| 1000 | 0.1288931 |
| 2000 | 0.2577862 |
| 3000 | 0.3866793 |
| 4000 | 0.5155724 |
| 5000 | 0.6444655 |
| 10000 | 1.288931 |
| 25000 | 3.222327 |
| 50000 | 6.444655 |
| 100000 | 12.88931 |
| 250000 | 32.22327 |
| 500000 | 64.44655 |
| 1000000 | 128.8931 |
What is the US Oil Barrel?
The US oil barrel (bbl) is a unit of volume equal to 42 US gallons, used almost exclusively for crude oil and petroleum products. It is the standard trading unit of the global oil industry.
Definition
The US oil barrel is defined as exactly 42 US liquid gallons:
Precisely, 1 bbl = 158.987294928 liters. This differs from other "barrel" definitions: the US fluid barrel is 31.5 gallons, the US federal beer barrel is 31 gallons, and the UK barrel is about 163.66 liters.
Origin and History
The 42-gallon standard traces to the early Pennsylvania oil boom of the 1860s. Producers adopted the 42-gallon "tierce" wooden barrel, which was slightly larger than the common 40-gallon whiskey barrel, allowing for spillage and evaporation losses during transport. In 1872 the Petroleum Producers Association formalized 42 gallons as the standard, and it endures today even though oil is now moved by pipeline and tanker rather than in physical barrels.
Law and Notable Facts
The oil barrel is not an SI unit but is deeply embedded in commodity markets, where crude prices are quoted per barrel and production in barrels per day (bbl/d). The abbreviation "bbl" is thought to stand for "blue barrels" once used by Standard Oil. Physical 42-gallon barrels are rarely used in the modern industry.
Real-World Examples and Conversions
- 1 bbl = 42 US gallons ≈ 34.97 imperial gallons ≈ 158.99 liters.
- Global crude oil consumption is roughly 100 million barrels per day.
- A single barrel of crude yields about 19 to 20 US gallons of gasoline after refining.
- 1 metric ton of crude oil is roughly 7.33 barrels, depending on density.
What is the Acre-Foot?
The acre-foot is a unit of volume equal to the amount of water needed to cover one acre of land to a depth of one foot. It is the standard measure used for large-scale water resources in the United States, including reservoirs, irrigation supplies, and municipal water rights.
Definition
One acre-foot is defined as the volume of a prism with a base area of one acre (43,560 square feet) and a height of one foot, giving exactly 43,560 cubic feet.
Because the US survey foot and the international foot differ slightly, the acre-foot is fixed by its exact defining relation of 43,560 cubic feet, which equals about 1,233.48 cubic metres or 1,233,482 litres.
Origin and History
The acre-foot arose in the American West during the late 19th and early 20th centuries, as irrigation districts and water agencies needed a practical unit for measuring large volumes of stored and delivered water. It combines the acre, an old English unit of land area, with the foot of depth, making it intuitive for engineers estimating how much water a given area of reservoir or flooded field holds.
Law and Notable Facts
The acre-foot remains the legal and administrative unit for water rights, reservoir capacity, and interstate water compacts throughout the western United States. A commonly cited rule of thumb is that one acre-foot supplies roughly one to two typical American households for a year, which is why it is used to describe how many homes a reservoir can serve.
Real-World Examples and Conversions
- A single acre-foot equals about 325,851 US gallons of water.
- Lake Mead, the largest reservoir in the US, has a capacity of roughly 28.9 million acre-feet when full.
- An Olympic swimming pool holds about 2,500 cubic metres, or roughly 2 acre-feet.
- In metric terms, 1 acre-foot is approximately 1,233 cubic metres (1.23348 million litres).
Frequently Asked Questions
How many acre-feet are in one US oil barrel?
One US oil barrel equals about 0.0001288931 acre-feet, a tiny fraction since an acre-foot is an enormous volume.
How do I convert US oil barrels to acre-feet?
Multiply the number of barrels by 0.0001288931. For example, 1,000 barrels is about 0.128893 acre-feet.
How many oil barrels fill one acre-foot?
About 7,758.37 US oil barrels make one acre-foot of volume.
What is an acre-foot used for?
It is a standard unit in water management, describing the volume that covers one acre of land to a depth of one foot, about 1,233 cubic metres.
When would I compare barrels and acre-feet?
When petroleum or produced-water volumes at oilfields need to be measured against reservoir or irrigation capacities quoted in acre-feet.