How to Calculate Shipping Costs Based on Box Strength and Weight
Calculate and optimise shipping costs for heavy-duty double wall boxes.
Calculating costs
Quick answer
Double wall boxes add 40-60% more board weight than single wall, increasing actual weight charges. Dimensional weight (LxWxH/5000) also applies. Right-sizing minimises both. For heavy items, actual weight usually exceeds dimensional weight, so the box weight addition is directly felt in shipping cost. Use the lightest adequate specification: BC flute where AB is not required. Compare carrier rates as heavy-item pricing varies significantly between services.
Optimisation
Smallest box that fits with adequate void fill.
AB is heavier and more expensive.
Pricing varies significantly for 15kg+ parcels.
Freight: pallet efficiency or bulk buying.
Carrier considerations
Royal Mail small parcel to 2kg, medium parcel to 20kg. Courier services vary. For items over 25kg, pallet and freight services are usually more cost-effective than parcel carriers. Compare 3+ options for your typical weight and dimensions.
Shipping-optimised double wall
Right-sized heavy-duty boxes from ProcuraPack.
Browse double wall boxesFrequently asked questions
40-60% more board weight than single wall.
By actual or dimensional weight, whichever is greater.
Right-size, use lightest adequate specification, compare carriers.
For items over 25kg, pallet is usually more cost-effective.
AB is heavier, so yes.
Part of our guide
Product Guide: Double Wall Cardboard Boxes
Expert guides on double wall cardboard boxes for heavy-duty shipping and industrial packaging.
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