Eggs are the single most heavily relied-on ingredient in baking, and yet most home cooks have never measured one. Recipes call for “two large eggs” or “three eggs” without specifying weight, the carton at the grocery store has six different size grades to choose from, and the same recipe pulled from two different cookbooks can call for noticeably different egg quantities for what should be the same baked good. The result is a quiet source of inconsistency that becomes obvious only when a custard breaks or a cake collapses in the center.
The fix is simple: understand what the labels mean, learn the actual weight of an egg in the size you usually buy, and keep a kitchen scale on the counter. With those three things, the egg variable becomes the most controllable ingredient in the recipe instead of the most variable one.
The USDA size grades
In the United States, eggs are graded by total weight per dozen, not by individual egg size. The grades and their per-dozen minimums:
- Jumbo: 30 ounces per dozen (about 71 grams per egg in the shell).
- Extra Large: 27 ounces per dozen (about 64 grams per egg).
- Large: 24 ounces per dozen (about 57 grams per egg).
- Medium: 21 ounces per dozen (about 50 grams per egg).
- Small: 18 ounces per dozen (about 43 grams per egg).
- Peewee: 15 ounces per dozen (about 35 grams per egg).
The grade refers to total carton weight, so any individual egg within the carton may be lighter or heavier than the average. Producers grade to the mean, not the minimum.
For cooking purposes, the more useful numbers are the contents without the shell:
| Size | Whole (no shell) | White only | Yolk only |
|---|---|---|---|
| Jumbo | 63 g | 41 g | 22 g |
| Extra Large | 56 g | 36 g | 20 g |
| Large | 50 g | 33 g | 18 g |
| Medium | 44 g | 28 g | 16 g |
| Small | 38 g | 25 g | 13 g |
A large egg without its shell is therefore 50 grams, with about 33 grams of white and 18 grams of yolk. That five-gram difference between a large yolk and a medium yolk matters far more in custards and curds than the small difference in the whites.
Why almost every recipe assumes “large”
The convention dates to the early 1990s, when Cook’s Illustrated and a handful of other test kitchens standardized on large eggs as the default for published recipes. The choice was practical: large is the most commonly sold grade in US grocery stores, the weight (50 grams without shell) divides neatly for ratios, and the size is consistent with what most home cooks already had in the refrigerator.
Almost every American cookbook published since 1995 follows this convention. King Arthur, Bon Appetit, Serious Eats, NYT Cooking, America’s Test Kitchen, and most major recipe sites all use large as the default. When a recipe deviates, the deviation is typically called out in the ingredient list (“3 extra-large eggs” or “2 jumbo eggs, separated”).
European cookbooks are different. The EU egg grading system uses different labels (S, M, L, XL) with different weights, and “medium” in Europe corresponds roughly to US large. A British recipe calling for “2 medium eggs” is asking for about the same weight as a US recipe calling for “2 large eggs.”
Substitution math
When the only eggs on hand are not large, the question becomes how to match the target weight. The simplest approach is to weigh the eggs you have, multiply the number called for by 50 grams (or by 33 grams for whites, or 18 grams for yolks), and use whatever combination gets you to the target.
Two practical shortcuts:
For one or two eggs, just substitute one-to-one across sizes. The total weight difference is small enough that most recipes tolerate it. A medium for a large will leave the result slightly drier; a jumbo for a large will leave it slightly wetter.
For three or more eggs, the weight difference compounds. The standard substitution table:
| Recipe calls for | Use instead |
|---|---|
| 1 large | 1 medium, 1 extra-large, or 1 jumbo |
| 2 large | 2 medium, 2 extra-large, or 2 jumbo |
| 3 large | 3 medium, 3 extra-large, or 2 jumbo |
| 4 large | 5 medium, 4 extra-large, or 3 jumbo |
| 5 large | 6 medium, 4 extra-large, or 4 jumbo |
| 6 large | 7 medium, 5 extra-large, or 5 jumbo |
This table reflects matching total weight, not count. A recipe calling for six large eggs (300 grams total) gets seven mediums (308 grams) or five jumbos (315 grams) for the closest match.
When egg size matters most
Three categories of recipes are most sensitive to egg size:
Custards and curds. The yolk-to-liquid ratio determines the set. A lemon curd designed for large eggs (18 grams yolk each) made with jumbo (22 grams yolk each) will set firmer and sometimes break. Weigh the yolks.
Sponge and chiffon cakes. These rely on whipped whites for structure and aerated yolks for richness. Whites are particularly sensitive: a recipe asking for four large whites (132 grams) made with four jumbo whites (164 grams) will produce a wetter batter that will not climb the pan correctly.
Pastry doughs. The water content of an egg matters in pie dough, pasta, and brioche. An egg-yolk-enriched pasta calling for six yolks made with jumbo yolks adds about 24 grams of extra liquid, which can require a noticeable flour adjustment.
Three categories where egg size matters less:
Scrambled eggs, omelets, fried eggs. Use whatever is in the carton.
Most cookies. The dough’s total mass is large compared to the eggs, and small variations are absorbed by the flour and fat.
Quick breads and muffins. Generally forgiving.
Egg substitutes for allergies and dietary needs
Eggs play three roles in cooking: binding (holding ingredients together), leavening (adding lift through proteins and trapped air), and moisture. The right substitute depends on the role.
For binding (one egg = 50 grams):
- 3 tablespoons aquafaba (chickpea cooking liquid).
- 1 tablespoon ground flax in 3 tablespoons water, rested 5 minutes.
- 60 grams mashed banana.
- 60 grams unsweetened applesauce.
- 1 tablespoon ground chia in 3 tablespoons water, rested 10 minutes.
For leavening (in cakes and muffins):
- 1 tablespoon vinegar plus 1 teaspoon baking soda per egg.
- 3 tablespoons aquafaba whipped to soft peaks.
For commercial products:
- JUST Egg (mung-bean protein) works well in scrambles, French toast, and quiche, less well in baking.
- Bob’s Red Mill Egg Replacer is a starch-based product good for cookies and quick breads.
For meringues:
- Whipped aquafaba is the only widely usable substitute. Use 3 tablespoons per white. Texture is close to but slightly less stable than egg whites.
A practical kitchen rule
Keep a kitchen scale on the counter, and weigh eggs when the recipe is high-stakes. Custards, sponges, and meringues benefit from precision. Everyday scrambles and weeknight cookies do not.
The other useful rule is to settle on one size for home buying and stop thinking about it. Large is the path of least resistance for any cook working from US recipes. If a particular farm or carton tends to skew larger or smaller, weigh the carton when you bring it home and adjust if needed. After two or three rounds, the variance becomes obvious and easy to compensate for.
Frequently asked questions
What size eggs do most recipes assume?+
Large. In the United States, virtually every published recipe in the past 40 years assumes large eggs (about 50 grams without the shell) unless otherwise stated. The America's Test Kitchen and Cook's Illustrated style guides codified this convention in the early 1990s, and most major publications followed. The exception is European recipes, which usually assume medium eggs (about 53 grams in the EU grading system, which is closer to a US large).
Can I substitute extra-large or jumbo eggs for large in a recipe?+
For most non-baking applications (scrambled eggs, omelets, frittatas, fried eggs), yes, without adjustment. For baking, the answer depends on how many eggs the recipe calls for. One extra-large for one large is fine. Three jumbo for three large will produce a wetter batter that may not rise correctly. The general rule: use fewer larger eggs (two jumbo for three large), or weigh the eggs to match the target weight.
Why are the eggs in my refrigerator different sizes within the same carton?+
USDA size grades allow a tolerance: a 'large' carton must average 24 ounces per dozen but individual eggs can range from about 1.875 to 2.25 ounces. Hens lay eggs of varying sizes depending on age, breed, and stress, and processors only grade to the average. Older hens generally lay larger eggs, so cartons from one farm may skew larger than another while still meeting the same grade.
How do I substitute eggs for someone with an allergy?+
For binding (one egg's worth, 50 grams): 3 tablespoons aquafaba (chickpea liquid), 1 tablespoon ground flax in 3 tablespoons water, 60 grams mashed banana, or 60 grams unsweetened applesauce. For leavening in cake batters: replace each egg with 1 tablespoon vinegar and 1 teaspoon baking soda. Commercial replacers like JUST Egg work well in scrambles but inconsistently in baking. The right substitute depends entirely on whether the egg's role is structural, leavening, or moisture.
Do I need to refrigerate eggs?+
In the United States, yes. The USDA requires commercial eggs to be washed before sale, which removes the natural protective cuticle and requires refrigeration to maintain safety. In most of Europe, eggs are unwashed and stored at room temperature without issue. If you buy eggs from a backyard producer or farm stand where they were not washed, they can sit on the counter for one to two weeks. Once refrigerated, they should stay refrigerated.
