Duck Egg Converter: How Many Duck Eggs Replace Chicken Eggs in a Recipe

A recipe wants three large eggs and you have duck eggs. The answer is not “use three” and it is not “use two” — it depends on which duck laid them, and the honest way to convert is by weight. This converter puts the USDA’s chicken egg size classes on one side and published duck egg weights on the other, and tells you the count — plus, where the USDA publishes the edible weight of that chicken egg, the grams of beaten egg to weigh out instead of guessing.

Key takeaways

• A USDA Large chicken egg is a twelfth of 24 oz — about 57 g. A duck egg is 65–100 g depending on breed.
• eXtension’s general figure: duck eggs weigh 32–34 oz a dozen against 24–26 for large chicken eggs — roughly a third heavier.
• Three large chicken eggs weigh about 170 g in the shell and about 150 g cracked (the USDA gives 50 g of edible egg in a large one); by weight in the shell that is two Pekin eggs, or about two and a third Runner eggs.
• For cakes and custards, weigh the cracked egg to the gram figure. Counting is for omelettes.

The chicken side

The USDA’s standard for shell eggs sets weight classes by the dozen: Peewee 15 oz, Small 18, Medium 21, Large 24, Extra Large 27, Jumbo 30 — minimum net weights, with a tolerance for a few eggs in the class below. The standard does not publish a per-egg weight; the converter divides the dozen figure by twelve, which is how the classes are applied, and says so on the page. A Large egg is therefore about 57 g, a Medium about 50, a Jumbo about 71.

Outside the United States the classes differ — European sizes run S, M, L, XL by grams — but a Large US egg and a European M–L are close enough for a recipe, and the gram figure is the thing to carry across.

The duck side

There is no single authoritative weight for a duck egg in the shell; USDA FoodData Central gives 70 g for the edible part of one, without naming a breed or size. eXtension, in Jacquie Jacob’s article on ducks for egg production, gives the comparison by the dozen: 32–34 oz for duck eggs against 24–26 for large chicken eggs, which works out at about 75–80 g an egg. Metzer Farms’ breed chart gives egg weight by breed at 28.5 g to the ounce: Magpie, Runner and Mallard eggs at 65–80 g, most breeds at 75–90, Rouen 80–95, Appleyard 85–95, Pekin 90–100.

The converter offers both. “Duck eggs in general” uses the eXtension dozen; choosing a breed uses Metzer’s range for that breed, and the answer is given as a range because the input is one. The breed figures are the same ones in the breed comparison.

Why weight beats count

Three Large chicken eggs weigh roughly 170 g in the shell. In Pekin eggs that is 1.7 to 1.9 — two eggs, near enough. In Runner eggs it is 2.1 to 2.6 — two is under, three is over. Rounding either way changes a sponge. The converter gives the gram figure for exactly this reason: crack duck eggs into a bowl on the scales until you reach it, whisk, and use that. Any surplus goes in tomorrow’s omelette.

Two things weight does not fix. Duck eggs have proportionally more yolk and more fat, so the same weight of duck egg makes a richer, denser bake — usually welcome, occasionally too much in a very light cake. And duck egg whites are lower in water and do not whip as high, so for meringue the conversion is not just arithmetic. Duck eggs vs chicken eggs has the composition in detail.

The other direction

Older and farmhouse recipes sometimes call for duck eggs by count. Switch the converter round and it gives the equivalent in whichever chicken size you have — with the caveat that a cake written for duck eggs and made with chicken eggs will be a little less rich.

What this will not do

It will not tell you how fresh the eggs are — the freshness checker does, and the sexing tool settles which of your ducks could have laid them — and it will not give a figure for goose eggs or for breeds Metzer does not chart. It also does not know your recipe: a dish that depends on the ratio of white to yolk, like a soufflé, needs a cook’s judgement as well as a scale.

If the eggs are your own ducks’, collecting, cleaning and storing duck eggs covers what happens between the nest and the kitchen.