Convert Fluid Ounces to Forties

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

Results in Forties:
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1 fl oz = 0.025 forties

How to Convert Fluid Ounces to Forties

To convert a fluid ounce measurement to a forty measurement, multiply the beer volume by the conversion ratio. One fluid ounce is equal to 0.025 forties, so use this simple formula to convert:

forties = fluid ounces × 0.025

The beer volume in forties is equal to the fluid ounces multiplied by 0.025.

For example, here's how to convert 5 fluid ounces to forties using the formula above.
5 fl oz = (5 × 0.025) = 0.125 forties

Fluid ounces and forties are both units used to measure beer volume. Keep reading to learn more about each unit of measure.

Fluid Ounces

In the US, beer is often measured by the fluid ounce, which is the basis for other units of beer volume measure. The standard US bottle of beer contains 12 fluid ounces.

The fluid ounce is a US customary unit of beer volume. Fluid ounces can be abbreviated as fl oz, for example 1 fluid ounce can be written as 1 fl oz.


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.

Fluid Ounce Measurements and Equivalent Forty Conversions

Common fluid ounce values converted to the equivalent forty value
Fluid Ounces Forties
1 fl oz 0.025
2 fl oz 0.05
3 fl oz 0.075
4 fl oz 0.1
5 fl oz 0.125
6 fl oz 0.15
7 fl oz 0.175
8 fl oz 0.2
9 fl oz 0.225
10 fl oz 0.25
11 fl oz 0.275
12 fl oz 0.3
13 fl oz 0.325
14 fl oz 0.35
15 fl oz 0.375
16 fl oz 0.4
17 fl oz 0.425
18 fl oz 0.45
19 fl oz 0.475
20 fl oz 0.5
21 fl oz 0.525
22 fl oz 0.55
23 fl oz 0.575
24 fl oz 0.6
25 fl oz 0.625
26 fl oz 0.65
27 fl oz 0.675
28 fl oz 0.7
29 fl oz 0.725
30 fl oz 0.75
31 fl oz 0.775
32 fl oz 0.8
33 fl oz 0.825
34 fl oz 0.85
35 fl oz 0.875
36 fl oz 0.9
37 fl oz 0.925
38 fl oz 0.95
39 fl oz 0.975
40 fl oz 1

More Fluid Ounce Beer Volume Conversions

Convert to Beer Barrels
1 fl oz is equal to 0.000252 beer barrels
Convert to Beers
1 fl oz is equal to 0.083333 beers
Convert to Bombers
1 fl oz is equal to 0.045455 bombers
Convert to Cases
1 fl oz is equal to 0.003472 cases
Convert to Gallons
1 fl oz is equal to 0.007813 gallons
Convert to Growlers
1 fl oz is equal to 0.015625 growlers
Convert to Half Barrel Kegs
1 fl oz is equal to 0.000504 half barrel kegs
Convert to Quarter Barrel Kegs
1 fl oz is equal to 0.001008 quarter barrel kegs
Convert to Liters
1 fl oz is equal to 0.029574 liters
Convert to Pints
1 fl oz is equal to 0.0625 pints
Convert to Quarts
1 fl oz is equal to 0.03125 quarts
Convert to Six Packs
1 fl oz is equal to 0.013889 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.