How many UK imperial gallons are in one barrel?

One US oil barrel equals approximately 34.9723 UK imperial gallons. This follows from the two definitions: 1 barrel = 42 US gallons and 1 imperial gallon = 1.20095 US gallons, giving 42 / 1.20095 ≈ 34.9723.

What is the difference between a UK gallon and a US gallon?

A UK imperial gallon equals 4.54609 liters, while a US liquid gallon equals 3.78541 liters. The imperial gallon is about 20% larger than the US gallon, so there are fewer imperial gallons per barrel than US gallons.

How do I convert UK gallons back to barrels?

Click the swap button or select the "UK gal → bbl" direction, then enter the number of imperial gallons. The converter divides by 34.9723 to give you the barrel count.

Is this the same as a UK beer barrel?

No. A UK beer barrel is 36 imperial gallons (a different historical definition), while a US oil barrel is approximately 34.9723 imperial gallons. This tool converts the US petroleum barrel used in global oil trading.

Does this converter work for US gallons?

No, this tool converts to UK imperial gallons only. For US liquid gallons (1 US gal ≈ 3.785 liters), use the Barrels to US Gallons Converter instead.

Barrels to UK Gallons Converter

Convert oil barrels (bbl) to UK imperial gallons instantly, or reverse from imperial gallons back to barrels.

Volume Converter

Barrels (bbl)

UK Gallons (imp. gal)

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1 US oil barrel = 34.9723 UK imperial gallons

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Quick Reference Table

Barrels (bbl)	UK Gallons (imp. gal)

UK Gallons (imp. gal)	Barrels (bbl)

1 US oil barrel ≈ 34.9723 UK imperial gallons • 1 imp. gallon = 4.54609 liters

Summary

This tool converts US oil barrels (bbl) to UK imperial gallons using the approximate factor of 34.9723 imperial gallons per barrel. One US oil barrel equals 42 US liquid gallons or approximately 34.9723 UK (imperial) gallons, since an imperial gallon is larger than a US gallon (4.54609 liters vs 3.78541 liters). You can also reverse the conversion to find how many barrels a given number of imperial gallons equals.

How it works

Select the conversion direction: barrels to UK gallons, or UK gallons to barrels.
Enter a value in the input field.
The converter instantly shows the result using the factor of 34.9723 imperial gallons per barrel.
Use the swap button to flip the direction without clearing your input.
Scroll down to the reference table for common barrel-to-imperial-gallon lookups.

Use cases

Convert crude oil volumes from barrels to UK imperial gallons for British customers.
Check petroleum storage capacity when tanks are rated in imperial gallons.
Translate production reports that mix barrel and UK gallon units.
Verify fuel delivery quantities for UK-based distributors.
Compare OPEC barrel figures with imperial gallon equivalents used in Commonwealth markets.
Homework and exam problems involving imperial volume unit conversions.

Frequently Asked Questions

Last updated: 2026-06-15 · Reviewed by Nham Vu