Cattle Stocking Rate Calculator
Calculate the stocking rate for your pasture in Animal Units per Acre (AUA) using the USDA Natural Resources Conservation Service (NRCS) Animal Unit equivalent method. One Animal Unit (AU) is a 1,000 lb mature beef cow. Enter the number of head and their average weight to get total Animal Units, then enter your pasture area to find the stocking rate. Use this to compare against your land's carrying capacity.
Stocking rate formula (USDA NRCS)
Animal Units (AU) = (number of head x average weight in lbs) / 1,000
Stocking Rate (AUA) = total AU / pasture area (acres)
The Animal Unit method is published by the USDA Natural Resources Conservation Service (NRCS) in the National Range and Pasture Handbook. One AU is defined as a 1,000 lb (454 kg) beef cow with or without unweaned calf at side, consuming 26 lb of dry matter per day.
USDA NRCS Animal Unit equivalents
- Mature beef cow (1,000 lb): 1.00 AU
- Yearling cattle (600 lb): 0.60 AU
- Weaned calf (400 lb): 0.40 AU
- Mature bull (1,500 lb): 1.50 AU
- Horse (1,000 lb): 1.25 AU (higher forage consumption)
- Mature ewe with lamb: 0.20 AU
- Mature goat: 0.17 AU
Cattle stocking rate calculator: frequently asked questions
What is a stocking rate?
Stocking rate is the number of animals or Animal Units (AU) placed on a specific land area for a specific period. It is typically expressed as Animal Units per Acre (AUA) or Acres per Animal Unit. Proper stocking prevents overgrazing and maintains pasture health.
What is an Animal Unit (AU)?
The USDA NRCS defines one Animal Unit (AU) as a 1,000 lb (454 kg) mature beef cow with or without unweaned calf. All other livestock are expressed as fractions or multiples of this base unit. For example, one yearling cattle at 600 lb = 0.6 AU.
How do I determine my pasture's carrying capacity?
Carrying capacity depends on forage production, which varies by pasture type, soil, rainfall, and season. A rough USDA NRCS guideline for humid regions is 1-2 AUA; for semi-arid rangeland it can be 5-50+ acres per AU. Always consult your local NRCS office or extension service for site-specific data.
What is the difference between stocking rate and stocking density?
Stocking rate describes the long-term relationship between animals and a given land area. Stocking density is the number of animals per unit area at any one moment, used in rotational grazing to describe how many animals are in one paddock at a time.
How can I avoid overgrazing my pasture?
Monitor forage height: rotational grazing recommends moving cattle when grass height falls to 3-4 inches (cool-season grasses) or 4-6 inches (warm-season grasses). Rest pastures for 30-60 days before re-grazing. USDA NRCS recommends no more than 50% of forage production be consumed to maintain root reserves.
Official sources
- USDA NRCS: National Range and Pasture Handbook.
- USDA NRCS: NRCS Range and Pasture Resources.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.