Pasture Management Calculator

Calculate acreage needed per horse, paddock count, rest days, and stocking rate based on grass type, grazing system, and rainfall.

Inputs

Number of Horses

Grass Type

Grazing System

Annual Rainfall

inches

Tab to move between fields

Results

Acres Needed

6 acres

≈ 5 football fields

Paddock Count1

Rest Period0 days

Stocking Rate0.63 AU/acre

How to Use This Calculator

Enter Number of Horses and select Grass Type (Cool-Season, Warm-Season, or Mixed).
Choose Grazing System (Continuous or Rotational) — rotational allows recovery periods.
Set Rainfall category for your region.
Review Grazing Area (acres) needed and number of Paddocks for a rotational system.
Use these recommendations to prevent overgrazing, maintain sward height at 3-6 inches, and minimize mud.

How the result changes with Annual Rainfall

Annual Rainfall	Acres Needed
13	9 acres
31	6 acres
54	5.1 acres
73	5.1 acres

What each input means

Number of Horses: Total horses on the pasture.
Grass Type: Dominant pasture grass species affects forage yield.
Grazing System: Rotational grazing uses ~30% less acreage.
Annual Rainfall: Average annual precipitation in your area.

What each result means

Acres Needed: Total pasture acreage required.
Paddock Count: Number of paddocks for rotational system.
Rest Period: Days each paddock rests between grazing periods.
Stocking Rate: Animal Units per acre (1 horse = 1.25 AU).

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Number of Horses = 3, Grass Type = 1, Grazing System = 1, Annual Rainfall = 30 = 4 input(s) provided
Calculate Acres Needed
Acres Needed
6 = 6
Calculate Paddock Count
Paddock Count
1 = 1
Calculate Rest Period
Rest Period
0 = 0

Engine last updated July 26, 2026. Checked against 3 independently-derived tests — how we verify calculators.

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