How Many Ounces

 in Gallon, Liter, Quart, Pint, Pound, Cup ...

If You have the need to quickly convert ounces to other units and back, You have come to the right place.

How many ounces are in a:

GallonPoundPint
QuartKilogramLiter
CupTablespoonTeaspoon

With several systems of units in use today, it's no wonder that converting units from one system to another can be a rather daunting task.

After all, NASA and ESA (European Space Agency) tend to lose here and there their space probes due to unit conversions, despite these conversions being done to who knows what decimal.

However, for everyday use, such accuracy is not required - no recipe was ever ruined because somebody added 199.9g of sugar instead of 200g. Just an example.

The most commonly used unit systems include the International SI system of units, the US system of units, and the Imperial (mostly UK) system of units.

Most Popular Weight Units

SI weight unit for weight is a kilogram (or often just 'kilo'), while non-SI units are Imperial Ton, Tonne, 1 US Ton, Stone, Pound, and Ounce.

Other units may be used as well, but they are not used that often, like grain, drachm, slug, etc.

Non-SI Weight Units
SI Weight Units
1 Imperial Ton = 2240 Pounds1016.05 kg
 1 Tonne = 2204.62 Pounds1000 kg
1 US Ton = 2000 Pounds907.185 kg
1 Quarter = 28 Pounds12.70058 kg
1 Stone = 14 Pounds6.35029 kg
1 Pound0.453592 kg
1 Ounce =  1/16 Pound = 0.0625 Pounds0.0283495 kg = 28.3495g

Most Popular Volume Units

The most popular non-SI units for length are Nautical Mile, Mile, Yard, Foot, and Inch. Again, there are other units as well, but these are the most popular and still in frequent use.

Non-SI Lenght UnitsSI Length Units
1 Nautical Mile = 2025.37 Yards1852 m
1 Mile = 1760 Yards1609.34 m
1 Yard = 3 feet = 36 inches0.9144 m = 91.44 cm
1 Foot = 0.3333 Yard = 12 Inches0.3048 m = 30.48 cm
1 Inch0.0254 m = 2.54 cm

The units for volume are often derived from the units of length, but not necessarily, for example: 

Non-SI Volume UnitsSI Volume Units
1 Cubic Yard = 27 Cubic Feet0.764554857984 m3 = 764.554857984 liters
1 Cubic Foot = 1728 Cubic Inches = 957.506 US Fluid Ounces0.0283168 m3 =  28.3168 liters
Dry Quart (US) = 2 Dry Pints (US) = 67.2 Cubic Inches1101.22 milliliters = 1.10122 liters
Dry Pint (US) = 33.6 Cubic Inches550.6 milliliters = 0.5506 liters
1 Cubic Inch =  0.554113 US Fluid Ounces 0.0163871 liters = 16.3871 milliliters

Note: 1 Cubic Meter (m3) = 1000 liters = 1000 dm3

Also, sometimes the Imperial (British) system uses one unit (quart, pint) for liquid and dry measures, while the US system uses two units (dry quart, liquid quart, dry pint, liquid pint).

Probably the largest source of confusion among the units is conversion between US measurement system and Imperial (UK) measurement system:

US Units (Volume)
Imperial Units (Volume)
1 US Liquid Gallon = 128 US Fluid Ounces = 3.78541 liters1 Imp Liquid Gallon = 160 Imp Fluid Ounces =  4.54609 liters
1 US Liquid Gallon =  0.832674 Imp Liquid Gallon1 Imp Liquid Gallon =  1.20095 US Liquid Gallon
1 US Liquid Quart = 32 US Fluid Ounces = 0.946353 liters1 Imp Liquid Quart =  40 Imp Fluid Ounces = 1.13652 liters
1 US Liquid Quart =  0.832674 Imp Liquid Quart1 Imp Liquid Quart =  1.20095 US Liquid Quart
1 US Liquid Pint = 16 US Fluid Ounces = 0.473176 liters1 Imp Liquid Pint =  20 Imp Fluid Ounces = 0.568261 liters
1 US Liquid Pint =  0.832674 Imp Liquid Pint1 Imp Liquid Pint = 1.20095 US Liquid Pint
1 US Cup = 8.11537 US Fluid Ounces = 0.24 liters1 Imp Cup = 10 Imp Fluid Ounces = 0.284131 liters
1 US Cup =  0.844682 Imp Cup1 Imp Cup =  1.18388 US Cup
1 US Fluid Ounce = 29.5735 milliliters1 Imp Fluid Ounce = 28.4131 milliliters
1 US Fluid Ounce = 1.04084 Imp Fluid Ounces1 Imp Fluid Ounce = 0.96076 US Fluid Ounces
1 US Tablespoon = 1/2 US Fluid Ounces = 14.7868 milliliters1 Imp Tablespoon = 0.625 Imp Fluid Ounces = 17.7582 milliliters
1 US Tablespoon = 0.832674 Imp Tablespoon1 Imp Tablespoon =  1.20095 US Tablespoon
1 US Teaspoon = 1/6 US Fluid Ounces = 4.92892 milliliters1 Imp Teaspoon = 0.208333 Imp Fluid Ounces = 5.91939 milliliters
1 US Teaspoon = 0.832674 Imp Teaspoon1 Imp Teaspoon = 1.20095 US Teaspoon

 International System (SI) of Units Official Prefixes

In order to write extra small and extra large values more easily International System (SI) of Units uses prefixes that ranges from yocto (y, 10-24) to yotta (Y, 1024).

The following chart lists the International System of Units (SI) official prefixes:

PrefixBase 10DecimalEnglish Word
NameSymbolShort ScaleLong Scale
yottaY10241 000 000 000 000 000 000 000 000septillionquadrillion
zettaZ10211 000 000 000 000 000 000 000sextilliontrilliard
exaE10181 000 000 000 000 000 000quintilliontrillion
petaP10151 000 000 000 000 000quadrillionbilliard
teraT10121 000 000 000 000trillionbillion
gigaG1091 000 000 000billionmilliard
megaM1061 000 000million
kilok1031 000thousand
hectoh102100hundred
decada10110ten
--1001one
decid10-10.1tenth
centic10-20.01hundredth
millim10-30.001thousandth
microμ10-60.000 001millionth
nanon10-90.000 000 001billionthmilliardth
picop10-120.000 000 000 001trillionthbillionth
femtof10-150.000 000 000 000 001quadrillionthbilliardth
attoa10-180.000 000 000 000 000 001quintillionthtrillionth
zeptoz10-210.000 000 000 000 000 000 001sextillionthtrilliardth
yoctoy10-240.000 000 000 000 000 000 000 001septillionthquadrillionth

Note: the 'Short Scale' is in use, for example, in the United States, while the 'Long Scale' is in use, for example, in Europe - this may be the largest source of mistakes and errors in everyday speech and conversation.

Now that You know the relations between measurement systems, feel free to check how many ounces are in a:

GallonPoundPint
QuartKilogramLiter
CupTablespoonTeaspoon

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