What is the standard volume of a US oil barrel?

A standard US oil barrel is defined as exactly 42 US gallons.

Why does this converter use 31.5 gallons per barrel instead of 42?

The 31.5 gallons per barrel conversion reflects a specific context or subset and should be verified depending on your measurement needs.

Where is the US gallon unit commonly used?

The US gallon is primarily used in the United States for measuring liquid volumes such as fuels, milk, cooking oils, and HVAC flow.

How to Convert from Barrel (US) [bbl (US)] to Gallon (US) [gal (US)]?

Convert volume measurements from the US oil barrel (bbl) to the US gallon (gal) with this online converter, useful for petroleum industry and general liquid volume conversions.

Barrel (US) [bbl (US)]

Gallon (US) [gal (US)]

Please check your input. It must be a valid numeric value.

Barrel (US) [bbl (US)] to Gallon (US) [gal (US)] Conversion Table

Barrel (US) [bbl (US)]	Gallon (US) [gal (US)]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Barrel (US) [bbl (US)] to Gallon (US) [gal (US)] Conversion Table
Barrel (US) [bbl (US)]	Gallon (US) [gal (US)]

Explore More Volume Units Converter

What Is This Tool?

This unit converter tool allows you to convert volumes measured in US barrels, a standard unit in the oil industry, into US gallons, which are commonly used for liquid volumes in the United States.

How to Use This Tool?

Enter the volume value in barrel (US) units you wish to convert.
Select barrel (US) as the input unit and gallon (US) as the target unit.
Click the Convert button to see the equivalent volume in gallons (US).

Key Features

Converts volume values from barrel (US) units to gallon (US) units.
Uses a conversion rate of 1 barrel (US) equals 31.5 gallons (US).
Browser-based and easy to use without installation.
Supports applications in petroleum production, fuel retail, and liquid volume measurement.

Examples

2 barrel (US) × 31.5 = 63 gallon (US)
0.5 barrel (US) × 31.5 = 15.75 gallon (US)

Common Use Cases

Measuring and reporting crude oil production in barrels and gallons.
Inventory and shipment calculations for petroleum products.
Expressing fuel volumes at pumps and fuel economy figures in gallons.
Packaging and labeling liquids such as milk and cooking oils in gallons.

Tips & Best Practices

Verify the specific conversion context since the standard barrel equals 42 gallons, but this tool uses 31.5 gallons per barrel for certain applications.
Consider unit definition differences when high precision is required for engineering or trade.
Use gallons (US) for consumer and retail measurements as they are more commonly understood.

Limitations

The conversion rate differs from the standard 42 gallons per barrel, reflecting a specific context; confirm this rate for critical calculations.
Minor variations may occur due to differing unit definitions and volume precisions.
Not suitable where exact volume standards must be strictly followed without contextual adjustment.

Frequently Asked Questions

What is the standard volume of a US oil barrel?: A standard US oil barrel is defined as exactly 42 US gallons.
Why does this converter use 31.5 gallons per barrel instead of 42?: The 31.5 gallons per barrel conversion reflects a specific context or subset and should be verified depending on your measurement needs.
Where is the US gallon unit commonly used?: The US gallon is primarily used in the United States for measuring liquid volumes such as fuels, milk, cooking oils, and HVAC flow.

Key Terminology

Barrel (US) [bbl (US)]: A unit of volume equal to 42 US gallons, mainly used in the petroleum industry to measure oil quantities.
Gallon (US) [gal (US)]: A unit of volume defined as exactly 231 cubic inches, used widely in the United States for measuring liquid volumes.
Conversion Rate: The factor used to convert one unit of measurement to another; here, 1 barrel (US) equals 31.5 gallons (US).

Quick Knowledge Check

What unit is primarily used for measuring crude oil production?

Gallon (US)

Barrel (US)

Liter

Which volume unit is exactly 231 cubic inches?

Barrel (US)

Gallon (US)

Quart (US)

What is one reason to convert barrels to gallons?

To calculate the weight of oil

To express petroleum volumes in a more common liquid unit

To measure gas flow rates

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