Carton

LengthWidthHeight

Unit

USPS sizes are approximate interiors. Royal Mail, Japan Post and Zen Express figures are size limits, not fixed boxes.

Add item

NameColour

LengthWidthHeight

Weight (optional)Unit

Items

Settings

Show carton walls Show item names Snap while dragging

Snap step ()

Items can't overlap while dragging Items can't pass through walls

About

CartonFit is a free 3D box packing simulator. Set your carton size, add items, then drag and rotate them to check whether everything fits. Overlapping or overhanging items are highlighted.

Adding up item volumes can show that something is impossible, but not that it will fit: a long rigid item can fail in an almost empty box. CartonFit checks real positions. Items are modelled as rectangular blocks.

Getting started: click and drag a block to move it (hold Shift to lift it). Press R / F / T to rotate 90° about Y / X / Z. Green ✓ = fully inside, orange ▲ = sticking out, red ✖ = overlapping another object. Drag empty space to orbit, right-drag to pan.