Baking Conversions

Butter

A cup of butter weighs 8 ounces.  
1 ounce = 28.34 grams, so one cup of butter weighs 227 grams.
1/4 cup of butter = 57 g
1/3 cup of butter = 76 g
1/2 cup of butter = 113 g

All-Purpose Flour and Confectioners' Sugar
Cups/Grams/Ounces

1/8 cup (2 Tablespoons) = 16 g = .563 oz
1/4 cup = 32 g = 1.13 oz
1/3 cup = 43 g = 1.5 oz1/2 cup = 64 g = 2.25 oz  
2/3 cup = 85 g = 3 oz  
3/4 cup = 96 g = 3.38 oz  
1 cup  128 g  4.5 oz

Bread Flour
Cups/Grams/Ounces

1/4 cup = 34 g = 1.2 oz
1/3 cup = 45 g = 1.6 oz
1/2 cup = 68 g = 2.4 oz
1 cup = 136 g = 4.8 oz

Rolled Oats
Cups/Grams/Ounces  

1/4 c = 21 g = .75 oz  
1/3 c = 28 g = 1 oz  
1/2 c = 43 g = 1.5 oz  
1 c = 85 g = 3 oz

White Sugar (Granulated)
Cups/Grams/Ounces 

2 Tbsp = 25 g = .89 oz  
1/4 cup = 50 g = 1.78 oz  
1/3 cup = 67 g = 2.37 oz  
1/2 cup = 100 g = 3.55 oz  
2/3 cup = 134 g = 4.73 oz  
3/4 cup = 150 g = 5.3 oz  
1 cup = 201 g = 7.1 oz

Packed Brown Sugar
Cups/Grams/Ounces 

 
1/4 c = 55 g = 1.9 oz  
1/3 c = 73 g = 2.58 oz  
1/2 c = 110 g = 3.88 oz  
1 c = 220 g = 7.75 oz

Honey, Molasses & Syrup
Cups/Grams/Ounces  

2 Tbsp = 43 g = 1.5 oz  
1/4 c = 85 g = 3 oz  
1/3 c = 113 g = 4 oz  
1/2 c = 170 g = 6 oz  
2/3 c = 227 g = 8 oz  
3/4 c = 255 g = 9 oz  
1 c = 340 g = 12 oz

Cocoa Powder

1 cup = 118 grams = 4.2 oz
1 Tablespoon = 7.4 grams = .25 ounces

Eggs
One Large Egg (out of shell) = 49.6 grams = 1.75 ounces
One Extra Large Egg (out of shell) = 55 grams = 1.95 ounces
One Medium egg = 3 tablespoons
One Large egg = 3¼ tablespoons

Old School Canned Good Measurements
#1 Can (aka "Picnic Can") = 1.25 cups or 10 ounces
#2 Can = 2.5 cups or 20 ounces
#2.5 Can = 3.5 cups or 28 ounces
#3 Can = 5.75 cups or 46 ounces
#10 Can = 12 cups (3 quarts) or 96 ounces 
#22 Can = 2.5 cups or 20 ounces
#300 Can = 1.75 cups or 14 ounces
#303 Can = 2 cups or 16 ounces