Chicken egg sizes


are graded by size, for the purpose of sales. The egg shell constitutes 8–9% of the weight of the egg

United States of America

The United States Department of Agriculture sizing is based by weight per dozen. The most common U.S. size of chicken egg is 'Large' and is the egg size commonly referred to for recipes.
The following egg masses including shell have been calculated on the basis of the USDA sizing:

Canada

In Canada, modern egg sizes are defined as follows:
SizeMinimum mass per egg
Jumbo70 g
Extra Large63 g
Large56 g
Medium49 g
Small42 g
PeeweeLess than 42 g

Europe

In Europe, modern egg sizes are defined as follows.
SizeMinimum mass per egg
Extra large 73 g
Large 63 g
Medium 53 g
Small Less than 53 g

Post-Soviet countries

In countries which are members of Interstate Council for Standardization, Metrology and Certification: Russia, Belarus, Moldova, Kazakhstan, Azerbaijan, Armenia, Kyrgyzstan, Uzbekistan, Tajikistan, Georgia, and Turkmenistan eggs are sorted into five categories by mass:
CategoryMass range per egg
Highest 75 g and more
Select 65 g – 74.9 g
First 55 g – 64.9 g
Second 45 g – 54.9 g
Third 35 g – 44.9 g

Australia

In Australia, the Australian Egg Corporation defines the following sizes in its labeling guide.
SizeMass range per eggAverage mass per egg
King‐size71.7 g – 78.5 g73 g
Jumbo66.7 g – 71.6 g68 g
Extra-Large58.3 g – 66.6 g60 g
Large50.0 g – 58.2 g52 g
Medium41.7 g – 49.9 g43 g

In Western Australia, two additional sizes are also standardized by the Golden Eggs Corporation
Mega or XXXL72 g
Medium43 g

New Zealand

In New Zealand sizes are based on the minimum mass per egg:
SizeMinimum mass per egg
Jumbo 68 g
Large 62 g
Standard 53 g
Medium 44 g
Pullet 35 g

SizeMass range per egg
Size 0Greater than 75 g
Size 170 g – 75 g
Size 265 g – 70 g
Size 360 g – 65 g
Size 455 g – 60 g
Size 550 g – 55 g
Size 645 g – 50 g
Size 7Less than 45 g

Brazil

In Brazil sizes are based on the mass. :
Size
JumboGreater than 66 g
Extra60 g to 65 g
Large55 g to 59 g
Medium50 g to 54 g
Small45 g to 49 g
IndustrialLess than 45 g

Animal welfare considerations

According to Tom Vasey, chair of the British Free Range Producers' Association, laying larger eggs is painful for the hen. He recommends shoppers only to buy eggs of medium or smaller sizes. Professor Christine Nicol of the University of Bristol has stated 'There is no strong evidence of pain in egg-laying hens but it's not unreasonable to think there may be a mismatch in the size of birds and the eggs they produce. We do often spot bloodstains on large eggs.'