Gallon Barrel Converter
Convert U.S. gallons and petroleum barrels on the 42 US gal per bbl basis. Enter either side and keep the opposite unit plus the formula in view.
US gal
bbl
use right away.
- Visible firstKeep inputs and results in clear view.
- Result firstPut the main number before the explanation.
- Less askingNo signup or extra data before the tool works.
Gallons and barrels read the same petroleum volume in different units
The barrel here is not a general container size. It is the petroleum barrel, written bbl, and the basis is 1 bbl = 42 U.S. gallons.
This page stays narrow on purpose: it converts between US gal and bbl without mixing in liters or Imperial gallons. That makes it useful when reading shipping notes, energy statistics, or product quantities that already use petroleum units.
Use it in screen order
Type in the left US gal pane and the right bbl pane updates to the same volume. Type in the right bbl pane and the left gallon value updates back. Read the two units side by side, then save the original unit and the converted unit together.
- The 42 gal button is a quick check for 1 bbl.
- Results display six decimal places.
- Copy the number with its unit label so the direction stays clear later.
Worked example
Take 84 US gal. Because the barrel basis is 42, the barrel result lands on an exact value. Smaller values, such as 1 US gal, show why the six-decimal display is useful.
Check the unit name
US gal means U.S. liquid gallon. It is not the Imperial gallon. bbl means the petroleum barrel, fixed here at 42 US gal.
Formula and source
The math is simple: divide gallons by 42 or multiply barrels by 42. EIA describes one barrel as 42 U.S. gallons.
Keep liters separate
This page is for US gal ↔ bbl only. If your source uses liters, cubic meters, or Imperial gallons, confirm that basis before combining values.
When both fields are filled
The last field you edit becomes the source value, and the opposite field is synchronized from it. If you are comparing figures from two different documents, reset first and enter one source value at a time.
FAQ
What kind of barrel does this use?
It uses the petroleum barrel, or bbl. Under this basis, 1 bbl equals 42 US gal.
Can I enter Imperial gallons?
No. The page is based on U.S. liquid gallons. Convert or confirm Imperial gallon values before using this result.
Why are there six decimal places?
Many gallon-to-barrel values do not divide evenly, so the screen keeps six places. Use the formula again if you need more precision.
When both fields have values, which side is the source?
The field edited most recently is the source. Editing gallons updates bbl; editing bbl updates US gal.
Does this calculate oil price or freight cost?
No. It only converts volume units. Price, taxes, freight, and crude quality need separate assumptions.