Add items
Each SKU’s length, width, height, weight and quantity. Tick Upright for “this side up” items; the rest can turn on any side.
For online sellers · Box picking
Pick the right box for every order, and see exactly how it packs.
Made by professionals, for professionals. Built by a working e-commerce operator who packs and ships orders, not a generic calculator.
Enter the items in an order and the boxes you stock. BoxFit tries every box, rotating items to fit, and ranks them best first: what fits, how full it is, the empty space and the total weight. Click any box to see the packing in 3D.
- Your boxes, your sizesFully custom. No carrier or marketplace size tiers. Mark each box Common, Uncommon or Rare, or make your own levels.
- Every box rankedCommon boxes are checked first, then the tightest fit wins. Boxes that don’t fit are still listed, with the reason.
- See it in 3DRotate and zoom the packed box. Items turn to fit, except ones marked “this side up”. Nothing floats: each item needs solid support under it.
- Big orders splitWhen no single box fits, BoxFit splits the order across the fewest boxes, common and cheaper boxes first, and shows them all in 3D.
Packer
Items
| SKU / item | L (in) | W (in) | H (in) | Wt (lb) | Qty | Upright | Remove |
|---|
Boxes
| Box name | L (in) | W (in) | H (in) | Box wt | Max wt | Cost ($) | Stock level | Remove |
|---|
Inner dimensions. Box weight, max weight and cost are optional. Cost breaks ties between equally good boxes.
Stock levels Checked in this order. Rename by typing.
What’s shipping
Tick the SKUs in this order and set how many. Only ticked SKUs are packed.
Leave room for packing material. BoxFit packs items edge to edge and doesn’t add bubble wrap, paper or air pillows. Pick a box with some empty space, or add padding to your item sizes.
Results
3D view
Pick a box in the results.
Drag to rotate. Scroll or pinch to zoom. Right-drag or two fingers to pan.
How it works
Add your boxes
Inner size, optional box weight, max weight and cost, and a stock level so common boxes get picked first.
Read the ranking
Every box, best first. If nothing fits, the best split across several boxes. Plus the ideal box size, so you know what to stock.
Pricing
All Access
14-day free trial$99/yr
Start your 14-day free trial with just an account. No card needed.
Quick mode and the demo work without an account.
How payment works
- Start your 14-day free trial with just an account. No card needed. We email you before it ends.
- When the trial ends, choose a plan to keep using Saved mode and sync: $12/mo or $99/yr. One plan, every feature included.
- Choose a plan during the trial and billing starts only when the trial ends, so you don’t lose any days.
- If you don’t choose a plan, your account locks but your data stays saved.
- Payments are handled securely by Stripe. Carina Dataworks never sees or stores your card.
- Cancel any time from Manage billing. You keep access until the end of the period you paid for.
Your data stays in your browser, and in your account only if you sign in.
Quick mode and the demo aren’t saved anywhere. In Saved mode your SKU library, boxes and stock levels are kept in this browser, and when you’re signed in they also sync to your account so they’re on every device you use. Packing runs in your browser; your items and boxes aren’t sent anywhere to be packed. No ads, no tracking cookies. Read the Privacy Policy.