Convert Forties to Gallons

Enter the beer volume in forties below to get the value converted to gallons.

Results in Gallons:
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1 forty = 0.3125 gallons
Do you want to convert gallons to forties?

How to Convert Forties to Gallons

To convert a forty measurement to a gallon measurement, multiply the beer volume by the conversion ratio. One forty is equal to 0.3125 gallons, so use this simple formula to convert:

gallons = forties × 0.3125

The beer volume in gallons is equal to the forties multiplied by 0.3125.

For example, here's how to convert 5 forties to gallons using the formula above.
5 forties = (5 × 0.3125) = 1.5625 gallons

Forties and gallons are both units used to measure beer volume. Keep reading to learn more about each unit of measure.


The forty is a US standard size bottle containing a 40 fl. oz. of beer. This size bottle is commonly associated with lower quality beer, but that is not always the case.

The forty is a US customary unit of beer volume.


The US gallon is a standard size equivalent to 128 fl. oz. of beer.

The gallon is a US customary unit of beer volume.

Forty Measurements and Equivalent Gallon Conversions

Common forty values converted to the equivalent gallon value
Forties Gallons
1 0.3125
2 0.625
3 0.9375
4 1.25
5 1.5625
6 1.875
7 2.1875
8 2.5
9 2.8125
10 3.125
11 3.4375
12 3.75
13 4.0625
14 4.375
15 4.6875
16 5
17 5.3125
18 5.625
19 5.9375
20 6.25
21 6.5625
22 6.875
23 7.1875
24 7.5
25 7.8125
26 8.125
27 8.4375
28 8.75
29 9.0625
30 9.375
31 9.6875
32 10
33 10.31
34 10.63
35 10.94
36 11.25
37 11.56
38 11.88
39 12.19
40 12.5

More Forty Beer Volume Conversions

Convert to Beer Barrels
1 forty is equal to 0.010081 beer barrels
Convert to Beers
1 forty is equal to 3.333333 beers
Convert to Bombers
1 forty is equal to 1.818182 bombers
Convert to Cases
1 forty is equal to 0.138889 cases
Convert to Growlers
1 forty is equal to 0.625 growlers
Convert to Half Barrel Kegs
1 forty is equal to 0.020161 half barrel kegs
Convert to Quarter Barrel Kegs
1 forty is equal to 0.040323 quarter barrel kegs
Convert to Liters
1 forty is equal to 1.182942 liters
Convert to Fluid Ounces
1 forty is equal to 40 fluid ounces
Convert to Pints
1 forty is equal to 2.5 pints
Convert to Quarts
1 forty is equal to 1.25 quarts
Convert to Six Packs
1 forty is equal to 0.555556 six packs

Unit of Measurement Conversion Made Easy!

There are thousands of units of measure in use across the globe, and converting from one to another can be very difficult since each conversion requires a different formula to derive the result. Our unit of measurement conversion tools are meant to be dead easy. We break the mold of the typical dry and complicated experience. In addition to converting from one measurement to another, we provide the formula so you can see how the conversion is done, use it on you’re own calculator if you need to!

Convert units of length, weight, volume, and area between imperial and metric measures

Understanding the Metric System

The metric system makes it relatively easy to convert from one metric unit to another metric unit. The metric system uses a base unit, think meters or grams, and a prefix such as kilo or milli. The prefixes differ from the base units by differing powers of 10. So to convert within the metric system it’s usually a matter of multiplying or dividing by one of the powers of 10.

Here is a list of some of the common metric prefixes:

  • “kilo” – 1,000x larger
  • “hecto” – 100x larger
  • “deca” – 10x larger
  • “deci” – 10x smaller
  • “centi” – 100x smaller
  • “milli” – 1,000x smaller

There is a helpful mnemonic for remembering the prefixes: “King Henry Died Until Drinking Chocolate Milk.”
The u in Until refers to the base unit.