# How Many Gallons Are in a Barrel of Oil?

Conversion of gallons to barrels of oil and barrels of oil to gallons is a relatively easy one because both gallons and barrels are units of volume, making their conversion relatively easy. We say relatively easy since deep down, a barrel is not only a unit of volume but a unit of volume under certain conditions.

Not to mention that the unit "barrel" was and still is used for measuring volume and that there are "dry barrels", "fluid barrels", "oil barrels", etc. In this article, we are discussing the "oil barrel".

## Conversion Formulas

Gallons are a non-SI measure of volume, with two different units - US Gallon and Imperial Gallon:

1 US Gallon = 128 US Fluid Ounces (fl oz) = 3.78541 liters → 1 liter = 0.26417 US Gallon

1 Imp Gallon = 160 Imp Fluid Ounces = 4.54609 liters → 1 liter = 0.219969 Imp Gallon

Actually, 1 US gallon is defined as having exactly:

1 US gallon = 3.785411784 liters

Also, an oil barrel (or barrel of oil) is a non-SI measure of volume, defined as:

1 oil barrel = 42 US gallons

Hence, one oil barrel equals:

1 oil barrel = 42 US gallons = 158.987294928 liters = 34.97231575 Imp gallons

Or for short:

1 oil barrel = 42 US gallons ≈ 35 Imp gallons ≈ 159 liters

However, one also should mention that the standard oil barrel is the amount of oil that at a standard pressure of 101.325 kPa and temperature of 60°F (15.6 °C) occupies a volume of exactly 1 oil barrel - this is important when trading with oil, however, not all oil types expand or shrink equally as the temperature and pressure increase or decrease.

But, for most of us, it is important to remember that 1 barrel of oil equals 42 US gallons, which is a little less than 159 liters.

Thus, in order to convert volume given in gallons into volume barrels of oil and vice versa, use this formula:

1 oil barrel = 42 US gallons = 34.97231575 Imp gallons

And forget about pressures, temperatures, oil density, and similar.

## Gallons to Oil Barrels and Oil Barrels to Gallons Conversion Examples

If You have 4.7 gallons (US/Imp) that would be:

Volume(oil barrels) = 4.7 / 42 = 0.1119047 barrels of oil

Volume(oil barrels) = 4.7 / 34.97231575 = 0.13439201 barrels of oil

Similarly:

• 1000 US Gallons = 23.809 barrels of oil
• 500 Imp Gallons = 14.297 barrels of oil
• 20 barrels of oil = 840 US gallons = 699.44 Imp gallons

etc.

## Gallons to Oil Barrels and Oil Barrels to Gallons Conversion Calculator

In order to convert gallons to oil barrels and oil barrels to gallons, feel free to use this conversion calculator - write the value that You have and click 'Calculate' to convert it:

Barrel of Oil:

US Gallons:

US Gallons:

Barrels of Oil:

### Barrels of Oil to Imperial Gallons

Barrels of Oil:

Imperial Gallons:

### Imperial Gallons to Barrels of Oil

Imperial Gallons:

Barrels of Oil:

## Gallons to Oil Barrels and Oil Barrels to Gallons Conversion Charts

Here are some gallons to oil barrels and oil barrels to gallons quick conversion charts to aid You with units' conversions:

 US Gallons Barrels of Oil 1 0.0238 10 0.2380 15 0.3571 25 0.5952 50 1.1904 100 2.3809 250 5.9523 500 11.904 1000 23.809 5000 119.04
 Barrels of Oil US Gallons 0.1 4.2 0.2 8.4 0.3 12.6 0.4 16.8 0.5 21 0.6 25.2 0.7 29.4 0.8 33.6 0.9 37.8 1.0 42

 Imperial Gallons Barrels of Oil 1 0.0285 10 0.2859 15 0.4289 25 0.7148 50 1.4297 100 2.8594 250 7.1485 500 14.297 1000 28.594 5000 142.97
 Barrels of Oil Imperial Gallons 0.1 3.497 0.2 6.994 0.3 10.491 0.4 13.988 0.5 17.486 0.6 20.983 0.7 24.480 0.8 27.977 0.9 31.475 1.0 34.972

For more values, please, use the conversion calculators.