Warehouse pallet positions calculator.

How the count is built

Searching for how many pallets fit in a warehouse usually gets a single rule of thumb. Real capacity depends on a layout choice: aisles take floor, and every extra beam level multiplies what is left. This calculator makes the layout explicit. It lays double-row rack units, two rows back to back, with an aisle on each side of every unit, and counts positions on both faces of each unit. Change the aisle width and you see at once what a narrower aisle, and the truck that goes with it, is worth in positions.

It models one layout only, selective double-row rack with straight aisles. Drive-in, push-back, pallet flow, floor stacking and very narrow aisle systems have their own geometry and are not covered, so a result here is a first estimate of one layout, not the capacity of your building.

Worked example

The floor is 100 ft wide and 200 ft long. Pallets are 40 in deep with a 6 in flue, so a double-row unit is 2 x 40 + 6 = 86 in = 7.17 ft deep. With 12 ft aisles, n units need n x 7.17 + (n + 1) x 12 feet: 4 units need 76.7 ft, 5 would need 95.8 + 12 = 107.8 ft, so 4 units fit with 11.3 ft left over.

Along the length, 200 − 20 ft of cross aisles leaves 180 ft, which holds 20 bays of 9 ft. Each bay holds 2 pallets per level on each of 2 faces, so one level has 4 x 20 x 2 x 2 = 320 positions and 4 levels give 1,280. On 20,000 sq ft that is 64 per 1,000 sq ft, or 15.6 sq ft per position.

How it is calculated

1. Unit depth = 2 x pallet depth + flue space.
2. Rack units = the largest n where n x unit depth + (n + 1) x aisle width does not exceed the floor width.
3. Bays = (floor length − cross-aisle length) / bay width, rounded down.
4. Positions = units x bays x 2 faces x pallets per bay x levels.

The 48 x 40 inch pallet is shown as the default because a USDA Forest Service study describes the 48- by 40-inch GMA-style pallet as the most common wood pallet repaired and remanufactured in the United States. The Rack Manufacturers Institute FAQ notes that the owner is responsible for making sure the floor slab supports the rack, forklift and equipment loads. Sources read October 26, 2026.

What this does not cover

• Fire-protection and building-code limits on storage height, flue spacing and aisle width. Check them with your authority having jurisdiction.
• Floor slab capacity, column grid, dock doors, sprinkler layout and clear height.
• Rack load ratings, which belong to your rack supplier and design professional.

Sources

• USDA Forest Service: Comparative performance of new, repaired, and remanufactured 48- by 40-inch GMA-style wood pallets (opened 2026-10-26)
• Rack Manufacturers Institute: FAQs (floor slab responsibility, reconfiguration) (opened 2026-10-26)