Pallet Rack Design Calculator

Each level's height in the formula is your loaded pallet height plus a fixed 10 in allowance for the beam and clearance above the load, and beam levels is the usable rack height divided by that per-level height, rounded down. A taller pallet makes each level consume more of the available rack height, so fewer whole levels fit into the same overall rack height — this is a direct, mechanical tradeoff in the calculation, not an approximation.

Beam load is the weight of two pallets on a single level (one beam pair), while frame load multiplies that same per-level load by the total number of beam levels in the bay, since an upright frame has to carry the combined weight of every level stacked on it, not just one. A rack with beam load of 5,000 lb and 4 levels would show a frame load of 20,000 lb, which is the number a rack manufacturer actually needs to certify the upright frame against.

Bay width is calculated as pallet width doubled plus 9 in of clearance (for the gap between the two side-by-side pallets and margin on each side), because bay width describes the opening's horizontal span as you face the rack — the direction two pallets sit next to each other. Pallet depth instead drives the aisle width calculation, since depth is the dimension that determines how far a forklift has to reach into the rack.

The aisle width formula (pallet depth in feet plus an 8 ft allowance) is explicitly calibrated for a standard counterbalance forklift, which needs a wide turning radius to enter a bay squarely. Reach trucks extend their forks into the rack while the truck body stays in the aisle, so they can operate in meaningfully narrower aisles than this formula assumes — the calculator's output is a counterbalance-specific estimate, not a universal minimum.