In short
- A run-in shed size calculator turns your horse count, horse size and herd mix into a floor-area range in square feet and the common footprints that meet it.
- Extension guidance is about 100 to 150 sq ft per average horse, with University of Minnesota Extension as low as 72 if every horse gets along. A 12 x 12 shed is 144 sq ft.
- Add room for big horses, a bossy horse or inside hay. Most guides start at 12 ft deep and suggest wider than deep.
- Two average horses that get along need about 200 to 300 sq ft. Results are typical planning ranges with no prices.
On this page
- How the floor area is worked out
- Sources give different numbers: here is the spread
- Depth, width and roof height: typical figures
- Florida notes for an Ocala run-in shed
- What this calculator does not cover
- Questions to ask a builder about a run-in shed
- Next step: get a written quote
- Sources
- Frequently asked questions
This run-in shed size calculator is for Ocala and Marion County horse owners who want a three-sided shelter for pastured horses and need a floor size before they talk to a builder. It sits beside our horse barn size calculator for stalls and aisles, and our run-in shed vs horse barn guide.
En español: calculadora de tamaño de cobertizo para caballos
| Your numbers | Result |
|---|
Common footprints that fit (width x depth, ft)
| Depth | Low end | High end |
|---|
Roof height, typical
| Where | Typical |
|---|
Example: two average-size horses that get along, no hay inside, 12 ft deep.
How the floor area is worked out
- Space per horse.
Average horse: 100 to 150 sq ft. Ponies use 72 to 100, draft horses 150 to 200 (our scaling, see below).
- Multiply by the number of horses.
Two average horses: 2 x 100 = 200 and 2 x 150 = 300 sq ft.
- Add for the herd.
A calm herd adds nothing. A bossy horse adds 25%, frequent fights 50%. Both are our planning allowances.
- Add any hay area.
Inside hay is added at the floor area you enter.
- Turn area into a footprint.
Divide by a depth of 12, 14 or 16 ft and round the width up to the next 4 ft. 200 / 12 is 16.7, so 20 x 12 (240 sq ft); 300 / 12 is 25, so 28 x 12 (336 sq ft).
Sources give different numbers: here is the spread
| Source | Figure | What it says |
|---|---|---|
| University of Minnesota Extension | 72 to 144 sq ft | Per average horse if all get along; more if they do not or if horses are larger. |
| Extension.org (horse health care) | 100 to 150 sq ft | Per horse that will use the shelter. Face away from prevailing winds. |
| Extension.org (dry lots) | 12 x 12 ft | 12 x 12 for one to two horses; the page's examples grow in 12 ft steps (12 x 24 for 3 to 4). |
| Horse-care and builder guides | 12 x 12 or 10 x 10 ft | Per horse, in the guides we read. They disagree, so we use the extension range. |
Why the low end can fit more horses. The dry-lot examples (12 x 12 for one to two horses, 12 x 24 for three to four) work out to as little as 72 sq ft per horse. That fits calm, small herds and works against you with a bossy horse. This calculator uses the wider 100 to 150 sq ft range for planning.
Depth, width and roof height: typical figures
| Item | Typical | What to know |
|---|---|---|
| Depth | 12 ft or more | Most guides start at 12 ft. One builder guide says at least 20 ft, which suits colder climates more than Florida. |
| Wider than deep | Yes | A wide front is harder for one horse to guard, and a lower-ranking horse is less likely to be cornered. |
| Open side clearance | 7 to 10 ft | One builder says 7 ft or more is fine even for 17-hand horses, which lower their heads to enter. Another says 10 ft. |
| Roof height | 8 ft back, 10 to 12 ft front | Supplier guides slope the roof down toward the back. Draft horses may need 12 to 14 ft at the front. |
Height figures come from builder and supplier guides, not extension publications. Confirm with your builder.
Florida notes for an Ocala run-in shed
- Shade matters. Our Florida climate barn design guide covers heat and storms. An open side facing the late-day sun takes the heat straight in.
- Storms. Afternoon thunderstorms are common in Florida summers. Watch where rain and wind hit your land and face the opening away from them.
- Hurricanes. A run-in is not a hurricane shelter. See what UF/IFAS Extension says in the run-in shed vs horse barn guide.
- Drainage. Extension.org says to place sheds for drainage. Ask your builder about the pad height and the low spots on your land.
- Setbacks and permits. Extension.org suggests keeping sheds 50 ft from property lines. Marion County has its own rules; check our horse barn permit guide.
What this calculator does not cover
- Price. No prices here. See horse barn cost in Ocala and the horse barn cost calculator.
- Foundation and floor. Pad, slab or stone dust, and bedding, are your builder's call.
- Engineering. Wind rating, post size and anchoring are not checked.
- Hay and feed rooms. For hay, see the hay storage space calculator.
- Paddock and fence. See fencing and paddock layout and the acres per horse calculator.
Questions to ask a builder about a run-in shed
- What size and depth do you recommend for my horses? Compare with the range above.
- How high is the roof at the front and the back? Ask for it in writing.
- Can the shed be extended later? Extension.org says typical run-ins are built to allow expansion.
- Which way should the opening face on my site? Ask what they know about wind and storms here.
- What is the wind rating and how is it anchored? Ask about hurricane-zone design.
Next step: get a written quote
This tool estimates floor space, not the price or the job. We are a referral service, not a builder; we connect visitors with independent local providers. Use the form below to ask independent local builders for a written quote, and read how to choose a horse barn builder first. To compare bids side by side, use the bid comparison calculator.
Sources
- Horse dry lots and shelters, University of Minnesota Extension: three-sided shelters placed to block winds; 72 to 144 sq ft per average horse if the herd gets along.
- Health care for horses, Extension.org: 100 to 150 sq ft per horse; face away from prevailing winds; set back at least 50 ft from property lines.
- Drylots for horses, Extension.org: 12 x 12 ft run-in for one to two horses, growing in 12 ft steps as horse numbers rise.
- Run-in shed size guide, Horizon Structures (a builder): wider rather than deeper; 10 ft interior; opening of 7 ft or more.
- Guide to shelter for horses, Mad Barn: depth of at least 20 ft; opening at least 10 ft high; cites Michigan State and University of Minnesota Extension.
Frequently asked questions
How big should a run-in shed be for one horse?
Extension.org gives 100 to 150 square feet per horse that will use the shelter, and a 12 x 12 ft shed (144 sq ft) is a common one-horse size. University of Minnesota Extension puts the range at 72 to 144 sq ft per average horse if every horse gets along. A 12 x 12 shed sits near the top of that range for one horse and at the bottom for two.
How big should a run-in shed be for two horses?
About 200 to 300 sq ft for two average horses that get along, which is roughly a 20 x 12 to 28 x 12 ft footprint. Extension.org lists a 12 x 12 shed for one to two horses, but that is tight if one horse is bossy or the horses are large, so many owners go wider.
How deep should a run-in shed be?
Most guides we read start at 12 ft deep so a horse can turn. One builder guide says at least 20 ft, which is more of a cold-climate concern. A wider-than-deep shed is easier for a lower-ranking horse to enter and harder for one horse to guard.
Which way should the open side of a run-in face?
Extension.org says to face it away from prevailing winds, so the answer depends on your land. In Florida also think about the late-day sun and where afternoon storms come from. Watch your property before choosing.
How tall should a run-in shed roof be?
Builder and supplier guides commonly give about 8 ft at the low back and 10 to 12 ft at the open front, and taller for draft horses. These figures do not come from extension publications, so confirm the height with your builder.