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Eggs are the glue that holds baking together, but they are notoriously difficult to measure. Because chickens don't lay perfectly standardized eggs, volume measurements are always an approximation. Generally, 4 large whole eggs will yield about 1 cup (240ml) of liquid. If you buy medium eggs, you will need 4 to 5 to reach the same volume.

When recipes call for separated eggs, the math changes drastically. The white makes up about two-thirds of the egg's liquid volume. To get 1 cup of egg whites (often needed for angel food cake or meringues), you must separate 7 to 8 large eggs. The yolk is much smaller and denser; you will need a staggering 12 to 14 large yolks to fill a single cup. If you buy cartons of liquid whole eggs, the conversion is simple: 1 cup of liquid egg equals 4 large shell eggs.

Have you ever tried to halve a recipe that calls for three eggs? You can't easily crack half an egg. This is why professional patisseries abandon volume entirely and use weight. A standard large egg without its shell weighs exactly 50 grams (30g white, 20g yolk). If you are using duck eggs, which are prized by bakers for their richer yolks, be aware that they are about 30% larger than chicken eggs by volume.

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Did You Know?

Bakers weigh their eggs. Because a "large" egg can legally vary in weight by several grams, professional bakers crack all their eggs into a jug and weigh them. A recipe calling for "200g of eggs" is infinitely more reliable than "4 large eggs."

Duck eggs are a baker's secret weapon. Duck eggs are about 30% larger than chicken eggs and have a significantly higher ratio of yolk to white. This extra fat makes cakes richer and gives them a higher, fluffier rise.

Carton eggs aren't just cracked eggs. Liquid whole eggs sold in cartons are pasteurized for safety, but they often contain small amounts of citric acid to prevent the yolks from turning grey when heated.

Scaling Up Recipes That Use Eggs — Without the Maths

Eggs are the most frustrating ingredient to scale in a recipe because they come in discrete, unbreakable units. You can easily measure half a cup of flour, but how do you measure half an egg? If you guess wrong, the consequences are severe. Too much egg acts like a rubbery sponge, making cakes dense and tough. Too little egg removes the structural binding, causing your baked goods to crumble into dust.

The solution is the "beaten egg" method. If you need to halve a recipe that calls for 3 eggs (meaning you need 1.5 eggs), do not try to eyeball a small egg. Instead, crack two large eggs into a bowl and whisk them thoroughly until the yolk and white are completely combined. Since 2 eggs equal 1/2 cup (8 tablespoons), you simply measure out 6 tablespoons of the beaten mixture. That is exactly 1.5 eggs.

If you are baking for vegans or have an egg allergy, scaling becomes a matter of substitution. The liquid from a can of chickpeas, known as aquafaba, is a miraculous egg white substitute. Three tablespoons of whipped aquafaba perfectly replaces one large egg white in meringues and macarons. For whole eggs in dense cakes, 1/4 cup of unsweetened applesauce replaces one large egg perfectly.

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