Pasture Rent per AUM Calculator
Pasture is rented two ways: a flat rate per acre, or a rate per animal unit month (AUM) for the forage the cattle actually eat. The same lease can be cheap or brutal depending on how much grass the acres really grow. Enter the carrying capacity and both prices to see what each acre of rent costs per AUM, and which deal is cheaper.
Run your numbers
Example values are loaded to show how the tool works. Replace every field with your own records or planning assumptions. Nothing entered here leaves your browser.
What the assumptions produce
Cash rent per acre ÷ AUMs per acre: what each month of forage costs under the per-acre lease.
Total AUMs ÷ grazing months: 1,000-lb cows with calves the ground carries.
Cash rent per acre × acres.
Going rate per AUM × total AUMs, against the per-acre lease.
How this calculator works
- 1An animal unit month (AUM) is the forage a 1,000-lb cow with a calf up to four months old eats in a month (Iowa State Ag Decision Maker, File C2-23).
- 2Divide the per-acre rent by the ground’s carrying capacity to put the per-acre lease on the same footing as a per-AUM or per-head quote.
- 3Total AUMs (acres × AUMs per acre) ÷ months in the grazing season gives the animal units the lease supports without overgrazing at that capacity.
Reading the result
- If the per-acre rent works out above the going rate per AUM, the tenant is paying for grass the acres don’t grow. Ask for a per-AUM or per-head lease, or a lower per-acre rent.
- Carrying capacity drives everything. A rent that pencils at 1.0 AUM per acre can double in real cost in a drought year at 0.5. Use a conservative figure and revisit it after dry years.
- Per-AUM rates published by USDA NASS are state averages for private, non-irrigated grazing land. Water, fence, who checks cattle and who pays for mineral all shift the fair rate.
Reproduce the method
These are the specific public references used to define the calculation and its interpretation. Methodology reviewed August 15, 2026.
- USDA NASS — Grazing Fees
Monthly private grazing rates per animal unit, per cow-calf pair and per head for 17 states.
- Iowa State Ag Decision Maker — Computing a Pasture Rental Rate (C2-23)
AUM definition and the carrying-capacity method: rate per AUM × AUMs per acre.
- USDA NRCS — Web Soil Survey
Soil-based range and pasture productivity estimates for a specific field.
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