Stocking rate matches grazing pressure to pasture — animal units over acres, or acres needed per animal unit. Overstocking degrades the land; understocking wastes forage.
The example
50 AU on 200 acres.
| A | B | |
|---|---|---|
| 1 | Item | Value |
| 2 | 50 / 200 | 0.25 AU/ac |
| 3 | Acres per AU | → 4 ac |
The formula
The formula:
How it works
How it works:
- Convert the herd to animal units (a 1,000-lb cow = 1 AU; scale others by weight).
- Divide by acres for AU per acre, or flip for acres per AU.
- Compare to the pasture’s carrying capacity — AU it can sustain without degrading.
- Factor AUM (animal-unit-months) for seasonal or rotational grazing plans.
Animal units normalize a mixed herd. Cows, calves, yearlings, and bulls eat different amounts, so counting “head” misstates grazing pressure. Converting each class to animal units (by weight relative to a 1,000-lb cow) lets one stocking-rate number govern the whole pasture — and lets you compare a cow-calf operation to a stocker operation on the same land.
Try it: interactive demo
Animal units and acres.
Variations
Acres per animal unit
Flip the ratio:
AU the land supports
Capacity × acres:
Animal-unit-months
Seasonal grazing:
Pitfalls & errors
Convert to AU. Weight-adjust each class; do not count raw head.
Carrying capacity. Stock to what the land sustains, not its peak.
Zero acres. Empty pasture gives #DIV/0!.
Practice workbook
Frequently asked questions
How do I calculate stocking rate in Excel?
What is an animal unit?
What's an animal-unit-month?
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