How to Calculate Shipping Costs by Box Strength and Size
Calculate and optimise shipping costs based on box size, weight, and strength.
Dimensional weight pricing
Quick answer
Right-size your boxes to minimise dimensional weight, which carriers use when it exceeds actual weight. A box twice the needed size can cost twice as much to ship. Calculate dimensional weight (LxWxH/5000) and compare with actual weight. The higher determines your shipping cost. Right-sizing typically saves 15-30% on shipping. Lighter board grades also reduce actual weight.
Optimisation tips
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Sizing: size guide or cost reduction.
Carrier rules
Royal Mail charges by size band and weight band. Couriers (DPD, Evri, DHL) use dimensional weight formulas. Each carrier has different thresholds. Compare rates for your specific box sizes and weights across 2-3 carriers.
Shipping-optimised boxes
Right-sized boxes from ProcuraPack.
Browse single wall boxesFrequently asked questions
By actual or dimensional weight, whichever is greater.
LxWxH/5000 in cm/kg for most carriers.
Typically 15-30% on shipping costs.
Yes, lighter board reduces actual weight.
Yes, rates vary significantly between carriers for different size/weight combinations.
Part of our guide
Product Guide: Single Wall Cardboard Boxes
Expert guides on single wall cardboard boxes for shipping, storage, and e-commerce packaging.
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