In short
- A horse barn concrete slab calculator turns the length, width and thickness of a pour into cubic yards to order and truckloads, so you can check a builder's slab line.
- Penn State Extension: 4 in minimum under stalls and light use, 5 in for drives and alleys with moderate traffic. Stable Management: wash rack at least 3 in, ideally 6.
- Formula: square feet x inches / 324 = cubic yards. We add 5 to 10 percent (our planning assumption) and round up to a quarter yard.
- Example: a 12 x 60 ft aisle at 4 in is 8.9 cubic yards. Order about 9.5 to 10, which is 1 to 2 truckloads at 8 to 10 yards a truck. Volume only: no prices, no engineering.
On this page
This horse barn concrete slab calculator is for Ocala and Marion County owners who have a quote with a concrete slab line and want to know how much concrete that is. It uses plain geometry and the slab thicknesses that extension services publish. For the layers under the floor, see horse stall flooring in Florida; to size the aisle first, use the aisle width calculator.
En español: calculadora de losa de concreto para establos
| Your numbers | Result |
|---|
Example: 60 x 12 ft, 4 in, no extra area.
How the slab estimate works
- Measure the slab.
Length times width in feet. Add a wash rack or apron as extra square feet.
- Pick the thickness.
4 inches for stalls and light use, 5 for aisles with trucks or a manure spreader, 6 for a wash rack. Your builder sets the real design.
- Convert to yards.
Square feet x inches / 324 = cubic yards. That is 12 inches to a foot and 27 cubic feet to a yard.
- Add extra.
We add 5 to 10 percent for an uneven base and spillage, and round up to a quarter yard.
- Count the trucks.
Divide by 8 to 10 yards a truck. The last truck is rarely full, so ask about the plant's minimum.
Cubic yards per 100 square feet
| Thickness | Concrete | With extra |
|---|---|---|
| 4 in | 1.23 | 1.3 to 1.36 |
| 5 in | 1.54 | 1.63 to 1.7 |
| 6 in | 1.85 | 1.95 to 2.04 |
With extra means 5 to 10 percent, rounded up to the next hundredth.
Common barn pours, worked out
| Pour | Concrete | To order |
|---|---|---|
| 12 x 40 ft, 4 in | 5.93 | 6.25 to 6.75 |
| 12 x 60 ft, 4 in | 8.89 | 9.5 to 10 |
| 12 x 100 ft, 5 in | 18.52 | 19.5 to 20.5 |
| 12 x 12 ft, 6 in | 2.67 | 3 |
Same formula as the calculator. Yards, with 5 to 10 percent extra. Not a price.
What this number does and does not cover
- Volume only. No base rock, forms, steel, vapor barrier, joints, finish or labor. Those are separate lines in a quote.
- Not a design. The builder or engineer sets thickness, steel and joint spacing for your soil and loads. See Marion County site soils.
- Slope counts. A floor that falls to a drain is a little thicker on average than a flat one. Ask what thickness the quote assumes.
- No prices. Costs are in the horse barn cost guide, with ranges that are planning estimates.
Questions to ask about the slab
- What thickness, in inches, and where does it change? Aisle, stalls and wash rack can differ.
- How many cubic yards is the pour? Compare it with this page. A big gap needs an explanation.
- Is steel included? Ask for mesh, fiber or rebar and the spacing.
- What is under the slab? Compacted base and any vapor barrier.
- What is the plant's minimum load? A small pour may carry a short-load charge.
Next step: get a written quote
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 that states the slab thickness and cubic yards, and read how to choose a horse barn builder first.
Sources
- Slab thicknesses 4 and 5 in: Penn State Extension, Horse Stable Flooring Materials and Drainage.
- Wash rack 3 to 6 in: Stable Management, Wash Stalls: the Wet and Dry of It (a trade article, not a code).
- Truck sizes: vendor ready-mix guides such as toolquik.com; loads vary by plant and road weight limits, so confirm with your supplier.
- The 5 to 10 percent extra is our planning assumption for an uneven base and spillage. Volume = square feet x inches / 324.
Frequently asked questions
How many cubic yards of concrete do I need for a horse barn aisle?
Multiply length by width in feet to get square feet, multiply by the thickness in inches, and divide by 324. A 12 by 60 foot aisle at 4 inches is 720 x 4 / 324 = 8.9 cubic yards. Most pros then add some extra for an uneven base and spillage. We use 5 to 10 percent as a planning assumption and round up to a quarter yard. Your concrete supplier or contractor makes the final order.
How thick should a horse barn concrete floor be?
Penn State Extension gives a 4 inch minimum under stalls and where vehicle use is limited, and 5 inches for drives and alleys with moderate traffic such as heavy pickups and manure spreaders. For a wash rack, Stable Management says at least 3 inches and ideally 6, well drained and reinforced. These are extension and trade figures, not code. Your builder or engineer sets the design thickness.
How many cubic yards does a concrete truck carry?
Vendor guides say a ready-mix truck drum holds about 10 cubic yards, but plants often load 8 to 10 because of road weight limits. That is why this page shows a range of truckloads. Plants also set their own minimum load and short-load rules, so ask your supplier.
Does this include rebar, base or joints?
No. It counts concrete volume only. Base rock, steel, vapor barrier, forms, joints, finish and slope to a drain are separate items on a builder's quote. Ask which of them are included.