Barrels to Gallons Converter
Convert oil barrels (bbl) to US gallons (gal) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
Barrels to Gallons formula
gal = bbl × 42
1 oil barrel = 42 US gallons · 1 US gallon = 0.0238 oil barrels
To convert oil barrels to US gallons, multiply the value by 42. For example, 1 bbl:
gal = 1 × 42gal = 42
So 1 bbl = 42 gal.
Mental math shortcut
This conversion is exact, so there is no need to estimate: just multiply by 42.
Barrels to Gallons conversion table
Gallons back to Barrels
The same values converted the other way, rounded for everyday use:
| US gallons | Oil barrels |
|---|---|
| 21 gal | 0.5 bbl |
| 42 gal | 1 bbl |
| 84 gal | 2 bbl |
| 210 gal | 5 bbl |
| 420 gal | 10 bbl |
| 4200 gal | 100 bbl |
| 42000 gal | 1000 bbl |
About the units
Oil barrels (bbl)
An oil barrel is exactly 42 US gallons (about 159 liters). It is the standard unit for crude oil.
US gallons (gal)
A US gallon is 128 US fluid ounces, exactly 3.785411784 liters. (The UK imperial gallon is 4.546 liters.)
Frequently asked questions
How many US gallons are in a oil barrel?
One oil barrel equals 42 US gallons.
What is 1 Barrels in Gallons?
1 bbl = 42 gal.
How do I convert Gallons back to Barrels?
Divide the US gallons by 42.