Egg Size Converter

Why egg size actually matters in baking

Recipes that call for a specific number of eggs are almost always written around Large eggs, since that's the US retail default. Swap in Jumbo or Medium eggs one-for-one and you can throw off a recipe's liquid ratio more than people expect: a Jumbo egg weighs about 71 grams while a Medium egg weighs about 50 grams — a 40% difference for something as central to a cake or custard's structure as its egg content. For a single egg in a batch of cookies it rarely matters; for a 3-egg cake or a curd that depends on a precise egg-to-liquid ratio, it can visibly change the texture.

The figures used here come from the USDA's official shell egg size standards, which set a minimum weight per dozen eggs for each size grade (with roughly ±3.3% tolerance allowed) rather than a fixed weight per egg. Jumbo is 30 ounces per dozen at minimum, Extra Large 27 ounces, Large 24 ounces, Medium 21 ounces, Small 18 ounces, and Peewee 15 ounces — each size step down is a consistent 3 ounces per dozen, or about 7g less per egg on average.

This converter treats the swap as a weight problem rather than a counting problem: it multiplies your egg count by the recipe size's average weight to get a target total, then divides that total by your available size's average weight to tell you how many eggs to actually crack. Round to the nearest whole egg for most recipes; for something weight-sensitive like a delicate meringue or custard, weigh the cracked eggs on a scale and match the converter's gram total directly instead of counting whole eggs.

Frequently asked questions

Can I substitute a different egg size in a recipe?

Yes, as long as you adjust the number of eggs to match the total weight the recipe expects, not just the egg count. One extra-large egg to one medium egg is not a 1:1 swap by weight, so for anything more than a single egg it's worth converting by weight rather than substituting egg-for-egg.

How much does an egg white or yolk weigh?

For a Large egg, the whole egg without its shell weighs about 50g, made up of roughly 30g of white and 18g of yolk. These are general estimates rather than fixed values — they vary somewhat by hen breed, diet and individual egg.

Why does the USDA size chart use minimum weight per dozen instead of average?

USDA egg size grades are a legal minimum weight per dozen eggs, not an average — a carton labeled Large must weigh at least 24 ounces per dozen, with an allowed tolerance of about ±3.3%. The average per-egg weights used in this converter are typical figures based on that minimum, so treat them as close estimates rather than exact per-egg weights.