# Chicken egg size: length × breadth by egg size, USDA weight classes, 3D egg models

> How big is a chicken egg in mm?

- Category: Everyday objects › Kitchen
- Kind: Standard part
- Basis: Peer-reviewed measurement of 2,476 eggs from nine genotypes (length, breadth, weight); USDA size classes by weight per dozen
- Page: https://xemstudio.com/objects/chicken-eggs/ · JSON: https://xemstudio.com/api/geometry?object=chicken-eggs · Plain text: https://xemstudio.com/objects/chicken-eggs/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 56.2 | 42.96 | 42.96 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Measured means: egg-type hens (supermarket eggs) 56.2 × 43.0 mm, 58.3 g; meat-type hens 59.1 × 44.1 mm, 64.6 g; small standard breeds 51.3 × 39.8 mm, 45.4 g. Overall 57.9 × 43.5 mm.
- Breadth / length (shape index) about 0.75; the widest point sits slightly toward the blunt end (modelled with the Hügelschäffer egg curve).
- US sizes are by weight per dozen, not dimensions: Jumbo 30 oz, Extra Large 27, Large 24, Medium 21, Small 18, Peewee 15 (minimums). A US Large egg averages at least 56.7 g, close to the egg-type mean above.
- Holders and incubator trays: size the seat for the breadth (43–44 mm for Large / Extra Large) and let the egg sit blunt end up.

## Sizes

| egg | length_mm | breadth_mm | weight_g |
|---|---|---|---|
| egg-type hens (mean) | 56.2 | 42.96 | 58.34 |
| meat-type hens (mean) | 59.05 | 44.06 | 64.62 |
| standard breeds (mean) | 51.33 | 39.78 | 45.4 |
| all 2,476 eggs | 57.88 | 43.52 | 61.88 |
| USDA Large (min per egg) | None | None | 56.7 |
| USDA Extra Large (min per egg) | None | None | 63.8 |
| USDA Jumbo (min per egg) | None | None | 70.9 |

## Where the files are

- Turkish Journal of Agriculture - Food Science and Technology: [Weight and shape-related traits in eggs from different chicken genotypes](https://agrifoodscience.com/index.php/TURJAF/article/download/7298/3431/63025) — web — Publisher's page; dimensions are facts
- Eggland's Best: [USDA egg size classes (weight per dozen)](https://www.egglandsbest.com/faqs/egglands-best-egg-sizes-determined) — web — Publisher's page; dimensions are facts

## Free STEP/STL (4 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/chicken-eggs/index.json

- egg-layer-56.2x43.0: [STEP](https://xemstudio.com/files/hardware/chicken-eggs/egg-layer-56.2x43.0.step) · [STL](https://xemstudio.com/files/hardware/chicken-eggs/egg-layer-56.2x43.0.stl) — Chicken egg, egg-type hens mean: 56.2 × 43.0 mm (≈58 g, US Large)
- egg-meat-type-59.1x44.1: [STEP](https://xemstudio.com/files/hardware/chicken-eggs/egg-meat-type-59.1x44.1.step) · [STL](https://xemstudio.com/files/hardware/chicken-eggs/egg-meat-type-59.1x44.1.stl) — Chicken egg, meat-type hens mean: 59.1 × 44.1 mm (≈65 g, US Extra Large)
- egg-small-51.3x39.8: [STEP](https://xemstudio.com/files/hardware/chicken-eggs/egg-small-51.3x39.8.step) · [STL](https://xemstudio.com/files/hardware/chicken-eggs/egg-small-51.3x39.8.stl) — Chicken egg, standard breeds mean: 51.3 × 39.8 mm (≈45 g)
- egg-cup-large: [STEP](https://xemstudio.com/files/hardware/chicken-eggs/egg-cup-large.step) · [STL](https://xemstudio.com/files/hardware/chicken-eggs/egg-cup-large.stl) — Egg cup / tray cell for Large eggs (Ø43 breadth)

## Questions

**How big is a large egg?**

About 56–58 mm long and 43 mm across (≈58 g).

**How are US egg sizes defined?**

By weight per dozen: Large is at least 24 oz a dozen.

## Fits with

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