8 random items packed in 101.971 ms

Paccurate packs your items into your boxes

Cartonization for the real world.

Find the cheapest way of packing with our lightning-fast API.

How does it work?

Under the hood, ρaccurate is a set of bin-packing algorithms bolstered by cost logic. It starts with a simple request.

    curl -X POST -d '{ 
        "itemSets": [{ 
        "refId": 0, 
        "dimensions": {"x": 5.5, "y": 6, "z": 6}, 
        "quantity": 3 
        "boxTypeSets": ["fedex"] 
    }' api.paccurate.io/

What is this for?

Designed for production shipping environments, ρaccurate is lightning fast, completing most requests in 100ms or less. A single, flexible API call can be used in any project or workflow.

More accurate shipping estimates.


By precisely simulating how your product will be packed, you can avoid over-estimating shipping, which reduces shopping cart abandonment.

Speed up the pick and pack process.


Turn warehouse staff into smooth operators- ρaccurate can generate a helpful pack list and visual instructions—and even generate intelligent pick zones on the fly.

Let paccurate determine the cheapest box configuration.


When business is booming, every cent counts. Use ρaccurate to find the optimal way of packing each parcel and pallet and avoid costly mistakes.

The Real Deal

Most cartonization schemes in use today work in one of the following ways, or a combination of the two:

  • Comparing the collective volume of items against the volume of a box. This can lead to real world problems (imagine trying to fit a 3 foot shovel inside a 2x2 box just because the shovel has a smaller total volume).
  • Accumulating historical packing data and referencing a "rule of thumb" database to make packing decisions. This can work in many cases, but when the system encounters a new product or product combination, there is no previous reference to use as a guide. This strategy also presupposes that your historical packing is optimal.

Unlike the above methods, ρaccurate simulates efficient packing solutions, live at runtime. That means less maintanence and less "guess and check."

Cost Optimization

It's not enough to simply calculate the fewest number of boxes an order will fit in. Here's why:

  • Weight limits and oversized cartons can result in unexpected costs.
  • Dimensional weight fees are here to stay. Sometimes (but not always) multiple smaller boxes are cheaper than one low density box.
  • Carrier rate tables, which change every year, do not scale linearly per weight and zone. In some zones, two boxes may generally be cheaper than one.

There's a lot more required for cost optimization than bin-packing math. ρaccurate spends much of its processing time considering a variety of factors, including the above costs, before returning an optimal result.

Follow the Rules

A flexible rules engine lets you tweak ρaccurate for your purposes. Some options include:

  • Exclusionary: Some items shouldn't be packed togther. For less mess, make sure your baking soda product isn't packed in the same box as your vinegar product.
  • This end up: Specify the amount of packing material that should be around items, or ensure that they are laid flat.
  • LTL Specific: Pallet building is an art and a science. Alongside ρaccurate's built-in understanding of pallet building best practices, you can make use of rules like Allowable Overhang to meet customer requirements or Cohort Packing to ensure items of the same type stick together.