How Sea Freight Rates Are Calculated (and Why They Change)

Stacked blue shipping containers at a port

If you’ve ever gotten a different sea freight quote for the same route two months apart, it’s not necessarily your forwarder changing their pricing arbitrarily — ocean freight rates are genuinely volatile and move with several underlying factors.

The Main Factors Behind Rate Changes

  • Container availability on a given route — a shortage of containers pushes rates up
  • Fuel surcharges, which shipping lines adjust periodically
  • Overall demand on the route, which spikes before major holidays and sales seasons
  • Whether you’re shipping FCL (a full container) or LCL (shared space), which are priced differently

FCL vs LCL Pricing Logic

A full container (FCL) is priced as a flat rate for the container regardless of how full it is, while LCL (less than container load) is priced by volume or weight, whichever is greater. For smaller shipments, LCL is usually cheaper in absolute terms but more expensive per unit of cargo — see our comparison of LCL vs FCL shipping for the full breakdown.

Shipping containers at a port, priced individually for FCL shipments

Why We Don't Quote a Fixed Rate Publicly

Because rates shift with market conditions week to week, a rate published today could be inaccurate by the time you book. Rather than work from an outdated number, ask us for a current rate for your specific route and cargo volume.