How to work out how many pallets fit in a warehouse

Why area divided by pallet size is not enough

The quickest estimate is floor area divided by the footprint of one pallet. It is a useful upper limit, but it assumes you could cut pallets to fill every gap. Pallets are rectangles, and only whole pallets can be placed, so the strips left along the walls are lost. On top of that, you need aisles, clearance and space for receiving and dispatch. A realistic figure is always lower.

Step 1: Measure the usable floor

Measure the length and width of the storage area in metres (or feet). Then take off the clearance you keep along each wall, for example 0.5 m on every side. A 40 × 20 m floor with 0.5 m clearance leaves 39 × 19 m to work with.

If there are columns, fire exits, electrical panels or doors that must stay clear, note them now. They take real positions away and a simple calculation cannot see them.

Step 2: Work out the real pallet footprint

Use the size the load actually takes on the floor, not just the pallet. If cartons overhang the pallet by 50 mm on each side, a 1200 × 1000 mm pallet takes 1300 × 1100 mm of floor. Forgetting overhang is one of the most common reasons a plan does not fit in practice. If you are not sure which pallet you have, the standard pallet sizes guide lists the common footprints in mm and inches.

Step 3: Count whole pallets in both directions

Divide the usable length by the pallet length and round down, then do the same for the width. Multiply the two. Then turn the pallet 90 degrees and repeat, and keep the better result.

Step 4: Allow for aisles and access

Every pallet must be reachable by the equipment you use. You can allow for aisles in two ways. A percentage allowance (for example 20% of the floor) is quick and fine for early planning. A better method is to decide the number and width of the aisles and take them off the real dimensions, because an aisle removes whole rows of pallets, not an average amount.

Aisle width depends on your handling equipment. Forklift and reach truck makers publish the aisle width their trucks need to turn and place a pallet. Use that figure plus your own safety margin. Whichever truck you use, check it before each shift: the free Forklift Inspection Checklist has the daily pre-use checks and a log for hours and defects.

Step 5: Keep space for non-storage work

Receiving, staging, dispatch, quarantine, returns and offices all need floor space. There is no universal percentage; use what matches your site. Then multiply the remaining floor positions by the stack height, but only if the loads can safely carry the weight of the pallets above and your floor and building allow it.

How high can you stack pallets on the floor?

There is no single safe number. The limit is the lowest of these: what the bottom load can carry without crushing (ask the supplier or test it), the condition of the pallets, the clearance you must keep below sprinklers, lights and the roof, and how far your equipment can lift. Stock rotation matters too: the higher and deeper the blocks, the harder it is to reach the oldest pallet first. Use your own product and site rules, not a general figure.

If you use racking: count positions, not floor space

In selective racking every pallet has its own place on a beam, so you count positions directly instead of fitting pallets into an area:

Count the floor level as the first level. How many levels fit depends on the loaded pallet height plus the lifting clearance and the beam depth for each level, the clear height of the building less the space kept below the roof or sprinklers, and the height your trucks can lift. The racking itself must be rated for the pallet weight on every beam level; confirm that with your racking supplier.

Planning a new layout rather than counting one you have? Rack rows usually stand back to back with an aisle between each pair, and the aisle width comes from the truck, as in step 4.

Common mistakes

• Using area ÷ pallet size and treating it as the real capacity.
• Forgetting cargo overhang, which can remove whole rows.
• Planning aisles from the pallet size instead of the truck’s stated working aisle.
• Ignoring columns, doors and fire exits.
• Stacking loads that cannot bear the weight, or stacking deeper than stock rotation allows.