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:
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 nonSI 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.
NonSI Weight Units
 SI Weight Units 
1 Imperial Ton = 2240 Pounds  1016.05 kg 
1 Tonne = 2204.62 Pounds  1000 kg 
1 US Ton = 2000 Pounds  907.185 kg 
1 Quarter = 28 Pounds  12.70058 kg 
1 Stone = 14 Pounds  6.35029 kg 
1 Pound  0.453592 kg 
1 Ounce = 1/16 Pound = 0.0625 Pounds  0.0283495 kg = 28.3495g 
Most Popular Volume Units
The most popular nonSI 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.
NonSI Lenght Units  SI Length Units 
1 Nautical Mile = 2025.37 Yards  1852 m 
1 Mile = 1760 Yards  1609.34 m 
1 Yard = 3 feet = 36 inches  0.9144 m = 91.44 cm 
1 Foot = 0.3333 Yard = 12 Inches  0.3048 m = 30.48 cm 
1 Inch  0.0254 m = 2.54 cm 
The units for volume are often derived from the units of length, but not necessarily, for example:
NonSI Volume Units  SI Volume Units 
1 Cubic Yard = 27 Cubic Feet  0.764554857984 m^{3} = 764.554857984 liters 
1 Cubic Foot = 1728 Cubic Inches = 957.506 US Fluid Ounces  0.0283168 m^{3} = 28.3168 liters 
Dry Quart (US) = 2 Dry Pints (US) = 67.2 Cubic Inches  1101.22 milliliters = 1.10122 liters 
Dry Pint (US) = 33.6 Cubic Inches  550.6 milliliters = 0.5506 liters 
1 Cubic Inch = 0.554113 US Fluid Ounces  0.0163871 liters = 16.3871 milliliters 
Note: 1 Cubic Meter (m^{3}) = 1000 liters = 1000 dm^{3 }
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 liters  1 Imp Liquid Gallon = 160 Imp Fluid Ounces = 4.54609 liters 
1 US Liquid Gallon = 0.832674 Imp Liquid Gallon  1 Imp Liquid Gallon = 1.20095 US Liquid Gallon 
1 US Liquid Quart = 32 US Fluid Ounces = 0.946353 liters  1 Imp Liquid Quart = 40 Imp Fluid Ounces = 1.13652 liters 
1 US Liquid Quart = 0.832674 Imp Liquid Quart  1 Imp Liquid Quart = 1.20095 US Liquid Quart 
1 US Liquid Pint = 16 US Fluid Ounces = 0.473176 liters  1 Imp Liquid Pint = 20 Imp Fluid Ounces = 0.568261 liters 
1 US Liquid Pint = 0.832674 Imp Liquid Pint  1 Imp Liquid Pint = 1.20095 US Liquid Pint 
1 US Cup = 8.11537 US Fluid Ounces = 0.24 liters  1 Imp Cup = 10 Imp Fluid Ounces = 0.284131 liters 
1 US Cup = 0.844682 Imp Cup  1 Imp Cup = 1.18388 US Cup 
1 US Fluid Ounce = 29.5735 milliliters  1 Imp Fluid Ounce = 28.4131 milliliters 
1 US Fluid Ounce = 1.04084 Imp Fluid Ounces  1 Imp Fluid Ounce = 0.96076 US Fluid Ounces 
1 US Tablespoon = 1/2 US Fluid Ounces = 14.7868 milliliters  1 Imp Tablespoon = 0.625 Imp Fluid Ounces = 17.7582 milliliters 
1 US Tablespoon = 0.832674 Imp Tablespoon  1 Imp Tablespoon = 1.20095 US Tablespoon 
1 US Teaspoon = 1/6 US Fluid Ounces = 4.92892 milliliters  1 Imp Teaspoon = 0.208333 Imp Fluid Ounces = 5.91939 milliliters 
1 US Teaspoon = 0.832674 Imp Teaspoon  1 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, 10^{24}).
The following chart lists the International System of Units (SI) official prefixes:
Prefix  Base 10  Decimal  English Word 
Name  Symbol  Short Scale  Long Scale 
yotta  Y  10^{24}  1 000 000 000 000 000 000 000 000  septillion  quadrillion 
zetta  Z  10^{21}  1 000 000 000 000 000 000 000  sextillion  trilliard 
exa  E  10^{18}  1 000 000 000 000 000 000  quintillion  trillion 
peta  P  10^{15}  1 000 000 000 000 000  quadrillion  billiard 
tera  T  10^{12}  1 000 000 000 000  trillion  billion 
giga  G  10^{9}  1 000 000 000  billion  milliard 
mega  M  10^{6}  1 000 000  million 
kilo  k  10^{3}  1 000  thousand 
hecto  h  10^{2}  100  hundred 
deca  da  10^{1}  10  ten 
    10^{0}  1  one 
deci  d  10^{1}  0.1  tenth 
centi  c  10^{2}  0.01  hundredth 
milli  m  10^{3}  0.001  thousandth 
micro  μ  10^{6}  0.000 001  millionth 
nano  n  10^{9}  0.000 000 001  billionth  milliardth 
pico  p  10^{12}  0.000 000 000 001  trillionth  billionth 
femto  f  10^{15}  0.000 000 000 000 001  quadrillionth  billiardth 
atto  a  10^{18}  0.000 000 000 000 000 001  quintillionth  trillionth 
zepto  z  10^{21}  0.000 000 000 000 000 000 001  sextillionth  trilliardth 
yocto  y  10^{24}  0.000 000 000 000 000 000 000 001  septillionth  quadrillionth 
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:
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