In short
- A stall mat calculator turns your stall count and size into the number of standard 4 x 6 ft rubber mats (24 sq ft each), their weight and the stone dust base in cubic yards.
- A 12 x 12 ft stall takes 6 mats with no cutting. Sizes that are not multiples of 4 and 6 ft need cut mats, so the count rises.
- Penn State Extension describes 4 to 5 inches of road base mix under mats; mat makers say about 4 to 6 inches of compacted stone dust.
- A 3/4 inch mat weighs about 90 to 100 lb. Results are planning ranges with no prices.
On this page
This stall mat calculator is for Ocala and Marion County horse owners who want to know how many rubber mats and how much base a barn needs before talking to a builder. It pairs with our horse stall flooring guide and the horse barn size calculator.
En español: calculadora de tapetes y base para caballerizas
| Your numbers | Result |
|---|
Example: four 12 x 12 ft stalls, 5 inches of compacted base.
How mats and base are worked out
- Floor area.
Stalls x width x length. Four 12 x 12 stalls: 4 x 144 = 576 sq ft.
- Mats, low end.
Floor area divided by 24 sq ft, rounded up. 576 / 24 = 24 mats. This assumes cut-off pieces are reused.
- Mats, high end.
Each stall on its own: the mats are laid either 4 ft or 6 ft wide, whichever needs fewer, and partial mats count whole. A 12 x 14 stall needs 8 (2 x 4 across and down), not the 7 that area alone suggests.
- Weight.
Mats x 90 to 100 lb. 24 mats weigh about 2,160 to 2,400 lb in total.
- Base volume.
Floor area x depth in feet / 27. 576 x (5 / 12) / 27 = 8.9 cubic yards compacted; 20% more for loose material is 10.7.
Common stall sizes: mats per stall
| Stall (ft) | Sq ft | Mats | Cuts needed |
|---|---|---|---|
| 10 x 10 | 100 | 6 | Yes |
| 10 x 12 | 120 | 6 | Yes |
| 12 x 12 | 144 | 6 | No |
| 12 x 14 | 168 | 8 | Yes |
| 12 x 16 | 192 | 8 | No |
Counts are per stall, laid in the way that needs fewer mats. Installers trim to fit, so ask them for their count.
What goes under the mats
| Source | Figure | What it says |
|---|---|---|
| Penn State Extension | 4 to 5 in | Road base mix under rubber mats; groove or slope the base so leaking urine can drain. |
| Sundance (mat maker) | 4 to 6 in | Spread stone dust and compact it with a vibratory compactor; loose dust makes mats hard to lock together. |
| Equine supplier guide | 4 in minimum | 6 in over clay soils, compacted. |
Watch out: a bid that says "mats included" may not say what is under them. Our stall flooring guide lists the layers to ask for, including slope and drainage.
Notes for an Ocala stall floor
- Sandy ground. Marion County soils vary. Read horse barn site soils in Marion County before choosing a base depth.
- Drainage. Extension guidance is a floor at least 12 in above outside ground. See the stall flooring guide.
- Delivery. Mats are heavy and stone dust comes by the truckload. Ask where it will be dropped and how it gets into the barn.
- Stall size. Not sure of the size? See stall size and barn layout.
What this calculator does not cover
- Price. No prices here. See horse barn cost in Ocala and the horse barn cost calculator.
- Layers under the base. Gravel, sand and fill depth depend on your site.
- Aisles, wash racks and slabs. Enter them as separate blocks or ask your builder.
- Mat thickness choice. The count is the same for 1/2 or 3/4 inch mats; only the weight changes.
Questions to ask a builder about mats and base
- How many mats, and what size? Compare with the range above.
- What is the base made of, how deep, and how is it compacted?
- Are the seams interlocked, tight or sealed?
- Who re-levels the base if it settles? Ask whether it is in the warranty.
- Are mats, base and labor separate lines? Use the quote comparison worksheet.
Next step: get a written quote
This tool estimates quantities, 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 stable flooring materials and drainage, Penn State Extension: road base mix under mats; 12 in floor height; slope or groove the base.
- Interlocking horse stall mat installation, Sundance via Greatmats: stone dust about 4 to 6 in, compacted.
- Horse stall mat installation patterns, System Equine: base at least 4 in compacted, 6 in on clay.
- 4 x 6 x 3/4 in rubber stall mat, Tractor Supply listing, and similar retail listings: mat weight about 94 to 100 lb.
Frequently asked questions
How many 4 x 6 ft stall mats do I need for a 12 x 12 stall?
Six. A 12 x 12 ft stall is 144 sq ft and one 4 x 6 mat covers 24 sq ft, so 144 / 24 is 6, and the mats fit as three across by two down with no cutting. Stalls that are not multiples of 4 and 6 ft need cut mats, so the count goes up.
How much does a 3/4 inch stall mat weigh?
Retail listings for 4 x 6 ft, 3/4 inch rubber mats mostly show about 94 to 100 lb each, with some at 90 lb and thinner or reinforced mats lighter. We plan on 90 to 100 lb. Check the weight in your supplier's spec sheet before you plan the delivery or the lift.
How deep should the stone dust base be under stall mats?
Penn State Extension describes 4 to 5 inches of road base mix under mats, and mat makers such as Sundance call for about 4 to 6 inches of stone dust compacted with a vibratory compactor. Your builder may use a different depth for your soil.
How many cubic yards of stone dust do I order?
Cubic yards = length x width x depth in feet divided by 27. A 12 x 12 stall at 5 inches compacted is about 2.2 cubic yards. Loose material shrinks when compacted, so suppliers advise ordering extra. This calculator shows the compacted volume and a figure 20% higher as a planning allowance; ask your supplier for theirs.
Do I need mats in the aisle too?
Not necessarily. Many barns mat only the stalls and leave the aisle as stone dust, pavers or concrete. If you want the aisle matted, add its area as a separate stall-sized block or ask your builder.