Magnums to US Fluid Ounces (magnum to fl oz)

1 magnum equals 50.72103405 US fluid ounces (rounded).

1 magnum = 50.72103405 US fluid ounces

How to convert magnums to US fluid ounces

To convert magnums to US fluid ounces, multiply the number of magnums by 50.72103405. The factor is rounded to 10 significant digits. To go the other way, multiply US fluid ounces by 0.01971568638 (rounded).

US fluid ounces = magnums × 50.72103405

Example: 10 magnums = 507.2103405 US fluid ounces.

Pints, quarts, gallons and fluid ounces differ between the US and the UK. Units are labeled 'US' or 'imperial' to avoid confusion.

About these units

Magnum (magnum)

Cooking & barCurrent unit

1.5 liters, two standard wine bottles.

Latin magnus, great, gives the magnum its name, a bottle holding 1.5 liters, exactly two standard 750 mL bottles. It is the smallest of the large formats in Wikipedia's table of wine bottle sizes and the one most often seen in ordinary shops and restaurants.

Wikipedia reports that most Champagne houses ferment only up to a magnum in the bottle, because bigger bottles are hard to riddle, and that larger formats are filled by transfer afterwards, which some believe lowers quality. The same article lists the magnum as the first step of a ladder of named sizes: double magnum at 3 L, Rehoboam at 4.5 L, Methuselah at 6 L. Its capacity is equivalent to about 50.7 US fluid ounces. Its date of first use is not given in the sources consulted here.

1 magnum = 1.5 liters (exactly).

Sources: Wikipedia: Wine bottle

US Fluid Ounce (fl oz)

US customaryCurrent unit

One 128th of a US gallon, 29.5735 mL. Not the same as the weight ounce, and about 4% larger than the imperial fluid ounce.

Fluid ounce began as an attempt to link volume to weight: the volume occupied by one ounce of some substance, such as wine in England or water in Scotland. Definitions varied by region and by liquid. When Britain defined its imperial gallon in 1824 as the space of ten pounds of water, the imperial fluid ounce came out so that an ounce of water weighs about one avoirdupois ounce. The US fluid ounce followed a different path and comes from the older wine gallon.

The US fluid ounce is exactly 1/128 of a US gallon, 29.5735295625 milliliters, about 4 percent bigger than the imperial one at 28.4130625 milliliters. American nutrition labels use yet another figure, treating one fluid ounce as 30 milliliters, a convenient rounding for serving sizes. The name is a trap, because a fluid ounce measures space while a weight ounce measures mass. A US fluid ounce of water weighs a bit more than an ounce of weight, while a fluid ounce of honey weighs considerably more.

1 US fluid ounce = 0.02957352956 liters (approximately).

Sources: Wikipedia: Fluid ounce; NIST SP 811, Appendix B.8: conversion factors for volume; 21 CFR 101.9: nutrition labeling household measures

Related conversions

See all volume units.