3D Box Packing Calculator - Find the Perfect Fit

The 3D box packing calculator uses a guillotine bin-packing algorithm to find the optimal box size for multiple items. You enter item dimensions, weight, and quantity. The algorithm tests all six rotation combinations, sorts items by footprint area, and stacks them horizontally. The result provides exact box dimensions in centimeters and an interactive 3D preview.

"Calculate box" determines the minimum box size required to fit your items. "Check your box" verifies if your items fit inside a specific container you already own. If items do not fit, the calculator displays the exact overflow in centimeters for length, width, and height, plus a fill-percentage indicator.

The packing algorithm produces near-optimal dimensions for shipments containing up to 20 items. It calculates a physically feasible layout where items never overlap. By default, the calculator adds 3 cm of padding to each dimension for filler material and cardboard thickness. You can adjust this padding to 0 cm to get bare-minimum interior dimensions.

The padding setting adds buffer space for bubble wrap, foam, or box walls. The default padding is 3 cm per dimension. In "Calculate box" mode, this value increases the final box size. In "Check your box" mode, it reduces the usable interior space. You can adjust padding from 0 to 30 cm in 0.5 cm increments.

The calculator flags shipments exceeding 30 kg actual weight or 36 volumetric weight. When a shipment crosses these carrier limits, the tool suggests splitting the items into two or more packages. It calculates separate dimensions and 3D previews for each sub-package.

Dimensional weight (or volumetric weight) is a pricing metric carriers use to charge for package volume rather than physical weight. Carriers calculate it as Length × Width × Height ÷ 5000 (in cm/kg) and bill the higher of the two values. The calculator displays both actual and dimensional weight so you can anticipate shipping costs.

The calculator supports up to 20 distinct item types per calculation. Each item type can have a quantity of 20, allowing up to 400 total pieces per box. Individual items can measure up to 200 cm per side and weigh up to 50 kg.

Your shipping data remains completely private. The calculator runs via JavaScript entirely in your browser. We send zero item dimensions or names to our servers. We use no analytics trackers on the packing inputs.