How we got these numbers
Enter forage, utilization, area, and months (if monthly) to see step-by-step.
Formulas
- Available DM =
acres × (lb/ac/mo × months)oracres × (lb/ac/season), then ×utilization%• Metric UI converts to kg/ha - AUM =
Available DM ÷ 780 - Head supported =
AUM ÷ (AUE × months) - Months supported =
AUM ÷ (AUE × head)
Example
200 lb/ac/mo, 4 months, 35% utilization, 40 acres:
- Raw DM = 200 × 4 × 40 = 32,000 lb
- Available DM = 32,000 × 0.35 = 11,200 lb
- AUM = 11,200 ÷ 780 ≈ 14.4 AUM
- Head supported (cow-calf) for 4 mo = 14.4 ÷ (1.0 × 4) ≈ 3.6 head
Estimates only. Verify with local range guidelines and adjust for species, weather, and soil.