Sheep Butchery Calculator: Estimate Meat Yields and Cuts from a Finished Lamb

Knowing how much meat a live lamb will yield is essential for both pricing direct sales and planning freezer space. The relationship between live weight and saleable meat is not straightforward — a thin lamb and an overfinished lamb of the same live weight will produce very different carcasses. The Sheep Butchery Calculator applies condition-adjusted dressing percentages and returns a full cut breakdown for any live weight.

Three body condition adjustments are available: thin (BCS 1–2), ideal (BCS 3), and overfinished (BCS 4–5). Dressing percentages are 44%, 47%, and 50% respectively, with packaged meat yields from carcass of 70%, 74%, and 76%. These reflect the real variation in the proportion of gut fill, hide, and fat trim relative to live weight.

The cut breakdown covers 17 retail cuts including leg (both legs), shoulder (both shoulders), loin chops, rack of ribs, breast, neck, chump chops, shank, liver, kidney, and fat. Each cut is shown in kilograms with an indicative retail price.

Dressing percentages are based on AHDB Beef & Lamb KO% data and UK abattoir records. The 47% ideal dressing figure reflects the AHDB-published UK average of 47.44% for finished lambs. Condition-specific adjustments are drawn from AHDB Body Condition Scoring guidance for sheep.

Enter the live weight of the lamb in kilograms. Select the body condition that most closely describes the animal. The calculator returns the dressed carcass weight, packaged meat yield, and a full cut breakdown. Use the results when pricing whole or half carcasses, or when advising customers about freezer requirements for their order.