Convert volume units — liters, gallons, cups, milliliters, cubic meters, barrels and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 gal | 2.38096e-05 bbl | |
| 0.01 gal | 0.000238096 bbl | |
| 0.1 gal | 0.00238096 bbl | |
| 1 gal | 0.0238096 bbl | |
| 5 gal | 0.119048 bbl | |
| 10 gal | 0.238096 bbl | |
| 50 gal | 1.19048 bbl | |
| 100 gal | 2.38096 bbl | |
| 1000 gal | 23.8096 bbl |
Common us gallon values converted to oil barrel — factor: 1 gal = 0.02381 bbl
| US Gallon (gal) | Oil Barrel (bbl) | Context |
|---|---|---|
| 0.0078 gal | 0.0001857 bbl | Tablespoon |
| 0.031 gal | 0.0007381 bbl | Quarter cup |
| 0.0625 gal | 0.001488 bbl | Cup |
| 0.125 gal | 0.002976 bbl | Pint |
| 0.25 gal | 0.005952 bbl | Quart |
| 0.5 gal | 0.0119 bbl | Half gallon |
| 1 gal | 0.02381 bbl | Gallon jug |
| 2 gal | 0.04762 bbl | Two gallons |
| 5 gal | 0.119 bbl | Jerrycan |
| 10 gal | 0.2381 bbl | 10-gallon drum |
| 20 gal | 0.4762 bbl | 20-gallon tank |
| 42 gal | 1 bbl | Oil barrel |
| 55 gal | 1.31 bbl | Drum barrel |
| 100 gal | 2.381 bbl | Large drum |
| 1,000 gal | 23.81 bbl | Tank |
Converting us gallon to oil barrel comes up frequently in cooking, chemistry, medicine, and engineering. A recipe written in metric units may need to be adapted for a kitchen using oil barrel, or a laboratory protocol may specify volumes in us gallon that need to be measured with equipment calibrated in oil barrel.
In everyday use, knowing that 5 gal = 0.119 bbl and 10 gal = 0.2381 bbl covers most common situations. For bulk calculations, 100 gal = 2.381 bbl is a useful anchor. The reverse conversion — oil barrel back to us gallon — uses the factor 42, so 1 bbl = 42 gal.
All conversions use the internationally recognized factor of exactly 1 gal = 0.02381 bbl. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: Oil Barrel = US Gallon × 0.023809557
Multiply any us gallon value by 0.023809557 to get oil barrel. One us gallon equals 0.023809557 bbl.
Reverse: US Gallon = Oil Barrel × 41.999942
US gallons ÷ 42 = barrels. Exact.
21 gal = 0.5 bbl, 42 gal = 1 bbl.
Barrels × 42 = US gallons.
Prices fuel in USD per gallon and tracks daily sales volume in thousands of gallons.
Calculates pesticide and fertilizer application rates in gallons per acre.
Measures pool volume in gallons to calculate chlorine and pH chemical dosages.
Purchases engine oil, transmission fluid, and coolant in quart and gallon containers.
Estimates coverage (one US gallon covers about 350 sq ft) and quotes by the gallon.
Specifies water heater tank capacity (40, 50, 80 gallons) for residential systems.
The US liquid gallon is defined as exactly 231 cubic inches, or 3.785411784 liters. It traces its origins to the Queen Anne wine gallon of 1707, which American colonies adopted.
The US gallon differs from the UK Imperial gallon by about 16.5%. This matters for fuel economy: a US MPG figure is lower than the equivalent UK MPG for the same car.
Interesting fact: The United States, Liberia, and Myanmar are the only countries using the US gallon as a primary everyday volume unit.
The US oil barrel (bbl) is defined as exactly 42 US gallons, equal to 158.987 liters. The 42-gallon standard was adopted by the Pennsylvania oil industry in 1866, based on the wine tierce barrel.
Oil barrels are the global benchmark for crude oil pricing: NYMEX WTI and ICE Brent futures are quoted in USD per barrel. OPEC quotas and national reserves are all expressed in barrels per day.
Interesting fact: No physical barrels are used to ship crude oil today. The unit is purely a pricing and accounting convention; tankers carry millions of barrels in sealed tanks.