3 Rotational Grazing Planners, Compared

Rotational grazing lives or dies on one number: how many days this paddock can carry this herd before the sward is grazed below the point it recovers from. Get it right and the pasture rebuilds itself. Get it wrong repeatedly and you are buying hay in July.

Working it out is annoying because the honest calculation needs figures nobody has to hand — dry matter available per acre, utilisation rate, intake as a percentage of body weight, regrowth rate for your species in your rainfall. So planning tools split into two camps: extension-grade calculators that ask for all of it, and quick tools that quietly assume most of it and do not say which assumptions they made.

How to judge a grazing planner

Does it show its assumptions? Intake at 2.5% or 3% of body weight, and utilisation at 50% or 70%, change the answer materially.

Is it built for your species? Cattle, sheep, goats, and horses differ in intake and in how hard they graze a sward.

Does it handle rest as well as graze? Days on is half the plan; days of recovery before you return is the half that determines next season.

Who stands behind the numbers? A university extension service and an app vendor are different kinds of source.

The comparison

Facts checked August 2026; plans can change.

Arkansas Forage Advisor Pasture Rotation Calculator

This is the one with the strongest provenance: it was developed by the University of Arkansas Division of Agriculture and estimates the number of days a paddock can be grazed by a given herd. When you are making a decision that costs money if it is wrong, a land-grant extension service is the source you want behind the coefficients.

The framing is regional. Forage growth curves in Arkansas are not those of Wyoming or Wales, so the further you are from that context, the more you should treat the output as a method rather than an answer.

AgentCalc Rotational Grazing Paddock Planner

AgentCalc answers the design question rather than the daily one: given herd size, consumption rate, and pasture growth, how large should each paddock be and how many do you need? That is the decision you make once, with fencing and water points, and it is the expensive one to get wrong.

Once the fences are up, it is not the tool you open on a Tuesday morning to decide whether to move the herd today.

ConductScience Pasture Carrying Capacity Calculator

ConductScience estimates grazing days and rotation from a carrying-capacity basis using an NRCS-derived forage budgeting method, which is a defensible and widely taught approach. Being explicit about the methodology is genuinely useful — you can check the assumptions against your own numbers.

It is presented for horse properties. The forage budgeting logic generalises, but the framing and defaults are aimed at horses rather than a beef herd.

Pasture Rotational Grazing Planner

Ours sits between the design tool and the extension calculator. You enter pasture size, paddock count, and herd size, and it plans a rotational schedule with an estimate of how long each paddock can support grazing before the herd moves on. It runs entirely in your browser with nothing to install.

The limitation is important and worth being blunt about: it works from the figures you give it and general grazing assumptions, not from a measurement of what is actually growing in your paddocks this month. Forage availability swings with rainfall, temperature, and season, so the schedule it produces is a plan to check against the sward, not a substitute for looking at it. For a defensible carrying-capacity figure, the extension tools above are the better authority.

Which one to pick

• If you want extension-backed numbers and you farm in a comparable region, use the Arkansas Forage Advisor.
• If you are still deciding how many paddocks to fence, use AgentCalc.
• If you want a stated NRCS-style forage budget, use ConductScience.
• If the fences exist and you want a rotation schedule you can adjust each week, use ours.

How to do it with Pasture Rotational Grazing Planner

1. Open the Pasture Rotational Grazing Planner.
2. Enter total pasture area, the number of paddocks, and your herd size.
3. Read the suggested days per paddock, then walk the sward and adjust — grazing height beats arithmetic every time. More outdoor and land tools are in the tools directory.

You might also need

• Feed Conversion Ratio Calculator — for the supplementary feeding side of the same budget.
• Area Converter — when your paddock is measured in hectares and the calculator wants acres.

Frequently asked questions

Is there a free rotational grazing planner that doesn’t need an account?

Yes — the Arkansas, AgentCalc, and ConductScience tools are all free to use online. Ours needs no account because the site has no signup at all.

How long should a paddock rest before regrazing?

Long enough for the forage to regrow to grazing height, which depends on species, season, and moisture rather than on a fixed number of days. In fast growth it can be a few weeks; in a dry spell it can be months. The USDA NRCS grazing management resources set out the principle of matching rest to regrowth rather than to the calendar.

Does rotational grazing always beat continuous grazing?

Not automatically. The benefit comes from the rest period, so a rotation with too many animals and too little recovery can be worse than a lightly stocked continuous system. Stocking rate is the primary variable; rotation is how you manage it.

Final thought

Plan the rotation on paper, then set the move date by looking at the grass. The calculator tells you what should be true; the sward tells you what is.

Try the free Pasture Rotational Grazing Planner