How Many Gallons in a Barrel of Oil?
Quick Answer
There are 42 US gallons in a barrel of oil.
1 barrel (oil) = 42 US gallons
Understanding the Conversion
One standard barrel of crude oil equals exactly 42 US gallons or approximately 159 liters. This standard was established by US oil producers in 1866. Note that other industries use different barrel sizes: a beer barrel is 31 gallons, and a UK barrel is 36 imperial gallons.
Formula
1 barrel (oil) = 42 US gallons
Common Examples
| Description | Value |
|---|---|
| A barrel of crude oil | 42 gallons (159 liters) |
| 10 barrels of oil | 420 gallons |
| Half a barrel | 21 gallons |
Quick Reference Table
Use this table for quick conversions between barrel and gallons:
| barrel | gallons |
|---|---|
| 1 | 42 |
| 2 | 84 |
| 5 | 210 |
| 10 | 420 |
| 25 | 1,050 |
| 50 | 2,100 |
| 100 | 4,200 |
Frequently Asked Questions
How Many Gallons in a Barrel of Oil?
There are 42 US gallons in a barrel of oil. One standard barrel of crude oil equals exactly 42 US gallons or approximately 159 liters. This standard was established by US oil producers in 1866. Note that other industries use different barrel sizes: a beer barrel is 31 gallons, and a UK barrel is 36 imperial gallons.
What is the formula to convert barrel to gallons?
The formula is: 1 barrel (oil) = 42 US gallons. To convert, multiply the number of barrels by 42 to get the equivalent in gallons.
How do I convert gallons to barrel?
To convert gallons to barrel, divide the number of gallons by 42. For example, 210 gallons equals 5 barrels.