What size stall does a horse need?

What the answer means

A 16 hh, 1,150 lb riding horse needs 114 sq ft (11 m²) to 178 sq ft (17 m²) of floor, and the size to build is 12 × 12 ft.

That is the standard American box stall, and the point of this page is that it was not reached by copying the neighbours.

It falls out of a rule that starts from the horse.

Floor area is the square of two to two and a half times the wither height, and it comes from the only study located that measured what box size does to a horse.

Every ranking answer to this question gives you a table instead.

10 × 10 for a pony, 12 × 12 for a horse, 16 × 16 for a draft, with nothing that asks how big your horse actually is.

The table happens to be right for the middle of its range and wrong at both ends, which is exactly where people who go looking are standing.

The formula, and a worked example

Two published rules run side by side here, from unrelated sources and using different inputs. Neither is a fudge of the other.

Rule one — from the horse’s height. Area = (k × wither height)², with k between 2 and 2.5.

For our 16 hh horse: 64 in is 5.33 ft, so 2 × 5.33 = 10.7 ft, squared is 114 sq ft; at 2.5 it is 178.

The middle of that band is 144 sq ft. A 12 × 12 stall is 144.

Watch the form of that equation, because it is where the published wording goes wrong. The multiplier is applied to the height and the result is squared.

The FASS Ag Guide restates the same source as “2 to 2.5 times the height of the horse (at the withers) squared”, which can just as easily be read as two to two and a half times the height squared.

Read it that way and you get 57 sq ft, less than half the floor.

The original paper settles it. Its own boxes were (2.5 × height)² and (1.5 × height)² square metres, and only that reading reproduces the box areas it reports.

Rule two — from body weight. 9 sq ft per 100 lb.

Our 1,150 lb horse comes to 104 sq ft (10 m²), which is well under the height rule and is meant to be: it is a bare minimum for a university or research barn, not a recommendation.

Having two rules disagree in a known direction is more useful than averaging them into one number. If your stall clears the height band you are comfortable; if it fails the weight rule you have a welfare problem rather than a preference.

Is a 10×10 stall big enough for a horse?

Not for a 16 hh horse.

100 sq ft is short of the 114 sq ft at the bottom of the band, and it is under the 104 sq ft the body-weight rule asks for as a minimum.

For a 12.2 hh pony it is right: that pony needs 69–109 sq ft.

Penn State treats 10 ft as the shortest wall worth building for a riding horse whatever the area comes to, and Extension Horses states the same floor as a size — 10 × 10 is the minimum box stall.

The reason it is a wall rule and not an area rule is being cast. A horse that lies down close to a short wall can end up with its legs against it and no way to get them underneath itself again.

What is the average stall size for a horse?

12 × 12 ft, and that is also what is normally meant by a good size stall for a horse.

Extension Horses puts it plainly: the minimum box stall for a riding horse is 10 × 10, more commonly they are 12 × 12, and 16 × 16 or larger is not uncommon.

What the average conceals is that it is only average for an average horse. A 15 hh horse of 1,000 lb needs 100–156 sq ft, so 144 sits comfortably inside it.

A 17.2 hh, 1,900 lb draft needs 136–213 sq ft, and the body-weight rule alone puts its minimum at 171 sq ft. A 12 × 12 fails both.

That is a whole page of its own.

How tall should a horse stall be?

10 to 12 ft is what horse barns are commonly built to, with 8 ft the minimum. The Ag Guide’s band is tighter, 8 to 10 ft.

For a tall horse neither band is the test. The rule that governs is at least 1 ft (0.3 m) of clearance above the horse’s ears when its head is held at its highest.

Measure that to the lowest thing a head can strike, not to the ridge.

In a barn with open trusses and no ceiling that is the bottom chord of a truss or a light fitting, and it is often a good deal lower than the roof.

Partitions are a separate figure. 8 ft is standard, 7.5 ft is the minimum Penn State sets, and Extension Horses works to 7 ft.

All three are set by the same thing: most horses can kick as high as 7 ft.

Where each input comes from

Height at the withers. The highest point of the shoulder, straight down to the ground, with the horse standing square on level ground.

In inches rather than hands, because the rule multiplies it — 16 hh is 64 in.

Body weight. Only the second rule uses it, so an estimate is fine.

A tape or the horse weight calculator will get you close enough.

Your stall. Measure inside the walls, not the outside of the frame.

A stall sold as 12 × 12 is often a little under once the boards are in.

Time spent in. Penn State gives the direction without a number: the more time a horse spends in a stall, or the more active it is, the larger the stall that is justified.

So this input picks where in the published band you sit rather than scaling it, and the range you see is always the sourced one.

Time in the stall	Area needed	Build	Is a 12 × 12 enough?
A few hours a day	114–144 sq ft	12 ft square	Yes
Overnight, out in the day	114–178 sq ft	12 ft square	Yes
In most of the day, or on box rest	144–178 sq ft	14 ft square	It scrapes in

What changes the answer

The 1½-times rule, and the trap in it. Penn State also states that the stall wall length is one and a half times the horse’s length.

It does not say which length, and the difference is enormous.

Back-solve it against their own datum of a 12 ft wall for a 1,000 lb horse and it implies a horse 8 ft (2.4 m) long, which is nose to tail.

Feed in the 66 in point-of-shoulder-to-buttock body length a weight tape uses and the rule returns a wall of 8.3 ft (2.5 m) — which the same page rules out two sentences later.

Mare and foal. Two occupants, so the floor doubles: 288 sq ft (27 m²) for our horse, built as 12 × 24 ft.

Extension Horses gives 16 × 20 ft as the useful foaling stall, which is much the same floor arrived at as a square.

The cheap route to the same thing is Penn State’s: take out the divider between two standard stalls. Two 12 × 12 boxes become a 12 × 24 for the cost of an afternoon.

Tie stalls. Sized on 4 sq ft per 100 lb rather than 9, because the horse is not expected to turn round.

Our horse comes to 46 sq ft (4 m²), and the Ag Guide’s worked example is 5 × 12 ft measured from the manger front to the back of the stall.

Turnout. No stall is large enough to be the whole answer.

The published standard is 30 minutes of turnout or 15 minutes of controlled exercise a day for a horse in a box stall, and the source is candid that no study has established the right figure.

The small dimensions nobody checks.

At least 4 sq ft of window per stall for natural light, and less than 3 in of clearance under a full-length door so a hoof cannot get stuck.

Horse stall size chart

Generated by the calculator above rather than typed, so the chart and the tool cannot drift apart. Read across for your horse; the last column is the size to build.

Type	Height	Weight	Area needed	By body weight	Build
Miniature	8.2 hh (34 in)	250 lb	32–50 sq ft	23 sq ft	8 × 8 ft
Small pony	11 hh (44 in)	400 lb	54–84 sq ft	36 sq ft	10 × 10 ft
Welsh pony	12.2 hh (50 in)	500 lb	69–109 sq ft	45 sq ft	10 × 10 ft
Large pony	14 hh (56 in)	700 lb	87–136 sq ft	63 sq ft	12 × 12 ft
Small horse	15 hh (60 in)	1,000 lb	100–156 sq ft	90 sq ft	12 × 12 ft
Riding horse	16 hh (64 in)	1,150 lb	114–178 sq ft	104 sq ft	12 × 12 ft
Warmblood	16.3 hh (67 in)	1,350 lb	125–195 sq ft	122 sq ft	14 × 14 ft
Light draft	17.2 hh (70 in)	1,900 lb	136–213 sq ft	171 sq ft	14 × 14 ft
Heavy draft	18 hh (72 in)	2,100 lb	144–225 sq ft	189 sq ft	14 × 14 ft

Horse stable dimensions in meters

The same rows in metric, since the rule the whole page rests on was published in square metres in the first place.

Type	Height	Weight	Area needed	Build
Miniature	0.86 m	113 kg	3–4.7 m²	2.4 × 2.4 m
Small pony	1.12 m	181 kg	5–7.8 m²	3 × 3 m
Welsh pony	1.27 m	227 kg	6.5–10.1 m²	3 × 3 m
Large pony	1.42 m	318 kg	8.1–12.6 m²	3.7 × 3.7 m
Small horse	1.52 m	454 kg	9.3–14.5 m²	3.7 × 3.7 m
Riding horse	1.63 m	522 kg	10.6–16.5 m²	3.7 × 3.7 m
Warmblood	1.7 m	612 kg	11.6–18.1 m²	4.3 × 4.3 m
Light draft	1.78 m	862 kg	12.6–19.8 m²	4.3 × 4.3 m
Heavy draft	1.83 m	953 kg	13.4–20.9 m²	4.3 × 4.3 m

Common questions about horse stall size

Is a 10×10 stall big enough for a horse?

For a 16 hh riding horse, no. The published area band for that horse is 114–178 sq ft and a 10 × 10 is 100.

It is enough for a pony: a 12.2 hh pony needs 69–109 sq ft, and 10 ft is the shortest wall Penn State will recommend for anything horse-sized anyway.

What is a normal size for a horse stall?

12 × 12 ft, 144 sq ft, and it is normal for a good reason rather than an arbitrary one. Run a 16 hh horse through the wither-height rule and it returns 144 sq ft at the middle of the band.

The American convention and a Danish behavioural study land on the same number.

How tall should a horse stall be?

10–12 ft to the ceiling, with 8 ft the minimum, and partitions 7–8 ft high.

For a big horse the real test is different: at least 1 ft of clearance above its ears with its head up, measured to the lowest light fitting or truss rather than to the roof.

What is the minimum horse stall height?

8 ft of headroom, and a partition of 7 ft at the very least.

Most horses can kick as high as 7 ft, which is why the partition figure is what it is, and Penn State asks for 7.5 ft to stop a horse getting a leg over the wall.

How much does it cost to build a 12×12 horse stall?

We do not publish a price.

A stall’s cost turns on what your local builder charges and on whether you are framing a new bay or fitting a front into an existing one, and any figure here would be stale within a season.

What this page can tell you is whether 12 × 12 is the size you should be pricing.

Do horses prefer to be stabled at night?

What has been measured is narrower than preference.

Horses in a box of (2.5 × wither height)² m² spent significantly longer lying on their chests with their legs tucked under them than the same horses in a box of (1.5 × height)².

That is the posture in which a horse can reach REM sleep, so box size affects how a horse rests. Whether it would rather be in or out is not what that study asked.

How big should a stall be for two horses?

Two horses do not share a box stall.

A mare and foal count as one occupant and a half in practice, and the published answer is a 16 × 20 ft foaling stall or, more cheaply, the divider taken out between two standard stalls to give 12 × 24 ft.

How wide should a barn aisle be?

8–14 ft between two rows of stalls, 12 ft being the usual working figure.

It matters more than it sounds: a 10-stall barn built two rows deep needs 2,160 sq ft (201 m²) of floor, and the aisle is about 33% of it.

Read next

• What size stall for a draft horse? — where a 12 × 12 stops being enough, and what the two rules say instead.
• What size stall for a mini horse? — both published rules are written for light breeds, and neither has a miniature in it.
• How big should a wash stall be? — the one stall sized around the handler rather than the horse.
• How many bags of shavings for a horse stall? — now you know the size, what it takes to bed it.
• How much does a horse weigh? — the second rule on this page needs a body weight.
• All horse calculators — the rest of the tools in this section.

Where these figures come from

Every coefficient behind this calculator is published and cited, and where two published sources disagree we say so rather than quietly pick one. Two such disagreements sit on this page.

The first is the wording of the area rule itself, which the Ag Guide restates in a form that can be read two ways; the paper it cites settles it.

The second is that the same Ag Guide’s own worked examples — 12 × 12 for a box, 5 × 12 for a tie stall — are more generous than the per-weight rules printed beside them.

• Equine Facilities: Stall Dimensions — Extension Horses (eXtension)
• Guide for the Care and Use of Agricultural Animals in Research and Teaching, 3rd ed., Chapter 8: Horses — Federation of Animal Science Societies (FASS)
• Horse Stall Design (Horse Facilities #4) — Penn State Extension
• Lying behavior in horses in relation to box size — Journal of Equine Veterinary Science 26(1):11-17, 2006
• Operation: Wash-stall Design — Stable Management, 2 October 2012