Stocking Rate Calculator

Overgrazing degrades pastures fast — the Stocking Rate Calculator tells you exactly how many animals your land can sustainably support based on available forage and grazing time. Enter your pasture size, dry matter per acre, utilization rate, livestock type, average animal weight, total grazing days, and number of paddocks. You'll get your stocking rate (head of livestock), plus Animal Unit Months, total forage required, available forage, days per paddock, and acres per head.

acres
lbs

Available forage dry matter yield per acre

50 %
25 %75 %

Percentage of available forage that will be consumed

lbs
days
4
115

Number of paddocks for rotational grazing (1 = continuous)

Results

Stocking Rate

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Animal Unit Months (AUM)

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Total Forage Required

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Available Forage

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Days per Paddock

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Acres per Head

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Frequently Asked Questions

What is stocking rate and why is it important?

Stocking rate is the number of animals per unit of land for a specific time period. It's crucial for sustainable pasture management as it prevents overgrazing, maintains soil health, and ensures adequate forage for livestock while allowing pasture recovery.

How do I determine the dry matter yield per acre?

Dry matter yield varies by pasture type, climate, and management. Perennial pastures in high rainfall areas typically yield 2-4 tons per acre, while native range may yield 1-3 tons. Contact your local extension office for site-specific estimates or conduct forage sampling.

What percentage of forage should I allow animals to consume?

Generally, allow 40-60% utilization of available forage. Lower utilization (25-40%) promotes pasture health and regrowth, while higher utilization (50-75%) maximizes short-term production but may stress the pasture. Consider your management goals and pasture conditions.

How many paddocks do I need for rotational grazing?

The number of paddocks depends on your rotation frequency and rest period goals. Typically, 4-8 paddocks work well for most operations. More paddocks allow shorter grazing periods and longer rest, improving pasture health and forage quality.

What is an Animal Unit Month (AUM)?

An AUM represents the amount of forage consumed by one animal unit (1000 lb cow with calf) in one month, typically about 780-900 lbs of dry matter. It's a standard measure used to compare different livestock types and calculate grazing fees.

How does animal weight affect stocking calculations?

Heavier animals consume more forage relative to their body weight. The calculator uses standard intake rates (about 2.5-3% of body weight in dry matter daily) to determine forage requirements. Adjust the average weight based on your specific livestock.

When should I adjust my stocking rate?

Monitor pasture conditions regularly and adjust stocking rates based on forage availability, weather conditions, and pasture health. Reduce stocking during drought or slow growth periods, and consider seasonal variations in forage production.

What's the difference between continuous and rotational grazing?

Continuous grazing allows animals constant access to the entire pasture, while rotational grazing moves animals between paddocks to allow rest and regrowth. Rotational systems typically support higher stocking rates and improve pasture health.