Figures are sourced and dated. Check them before relying on them in client work.
Warehouse Storage Capacity Calculator
Compare pallet capacity, aisle counts, and schematic layouts across selective, double-deep, push-back, drive-in, and shuttle ASRS configurations. All calculations run server-side.
What this calculator does
This calculator compares how many pallet positions a building footprint holds under five storage strategies: selective (single-deep) racking, double-deep racking, push-back, drive-in and shuttle-based AS/RS. For each it reports positions, positions per square foot, aisle count, rack levels and a schematic layout, so you can see the density trade-off before talking to a rack supplier.
Inputs that matter
- Pallet: length, width, height, weight and overhang, in imperial or metric units.
- Building: a rectangle, L, U or T footprint with its dimensions, the clear height and the column grid.
- Equipment and fire protection: the material handling equipment type (counterbalance, stand-up reach, double-deep reach, turret or VNA, or walkie), whether in-rack sprinklers are present and the commodity class.
- Space deductions: inbound and outbound staging percentages, dock apron depth and wall, a circulation allowance and any reserved areas.
- Rack options: lane depth for push-back and drive-in, and aisles, depth and pick-and-deposit stations for AS/RS. Honeycombing factors, flue space and cross-aisle spacing are editable assumptions.
How it works
Levels come from beam pitch, which is pallet height plus load clearance, beam thickness and flue space. The number of levels is the height cap divided by the pitch, rounded down, where the cap is the lowest of the clear height, the commodity class's maximum storage height without in-rack sprinklers and the equipment's lift height. At least one level is always assumed.
Aisle width is set by the equipment type. The packer fills the footprint with rack rows and aisles, adds cross-aisles at the set spacing and counts pallet positions across bays, depth and levels. Deeper systems are reduced by a honeycombing factor, which defaults to 0.85 for push-back, 0.65 for drive-in and 0.95 for AS/RS.
Each configuration is then scaled by the usable-area fraction left after staging, the dock apron, reserved areas and column losses. Combinations the equipment cannot serve, such as a walkie in a drive-in lane, show zero positions.
Frequently asked questions
- Which storage types does it compare?
- Selective single-deep racking, double-deep racking, push-back, drive-in and shuttle-based AS/RS. You can switch each on or off and set the lane depth for push-back and drive-in.
- What limits the number of rack levels?
- The lowest of the building's clear height, the maximum storage height allowed for the commodity class when there are no in-rack sprinklers, and the lift height of the chosen equipment. Taller pallets and larger flue spaces reduce the number of levels that fit.
- Can I use the results for permitting or construction?
- No. The tool states that its figures are order-of-magnitude estimates based on your inputs and typical assumptions, not for permitting, fire-protection design or construction. Verify with a qualified engineer, your rack supplier and the local authority before investing.