Practical explanations, formulas and planning guidance for the same shipping and logistics problems covered by our calculators.
Learn how delivery area, extended area and remote-area surcharges work, why ZIP code mix matters and how to model these fees before they distort shipping margins.
Read guideA practical 2026 guide to FedEx, UPS and USPS holiday surcharges, temporary price changes and the shipment characteristics that trigger the largest seasonal cost increases.
Read guideLearn how duties, taxes, brokerage and carrier disbursement fees change landed cost and why importers should model them separately from freight.
Read guideDHL volumetric weight explained: compare the 5,000 metric divisor with 139 for inches/pounds, calculate chargeable weight, and avoid common dimensional-weight mistakes.
Read guideLearn what container free time means, how last free day affects imports, and how to plan customs, trucking and unloading before charges begin.
Read guideCompare FOB, CIF and DDP responsibilities so importers can understand who pays freight, insurance, duties and destination costs.
Read guideCompare DDP and DAP under Incoterms 2020, including delivery responsibility, import clearance, duties, taxes and landed-cost implications.
Read guideA practical checklist for reducing container demurrage and detention risk through customs readiness, appointments, unloading plans and empty-return control.
Read guideLearn the difference between demurrage and detention, how free time works, and why container delays can create expensive import charges.
Read guide