Opening soon at dockmath.com
Freight math, done right
Free calculators for US importers and exporters, built so the math follows how carriers, forwarders and customs actually bill. We're putting on the finishing touches.
Free to use, nothing to sign up for, in English and Spanish.
0 TEU loaded0 ships sailed
Each box is a 40-footer, which counts as 2 TEU (twenty-foot equivalent units).
Try it before we open
Guess the load
How many cartons fit in a container? Make your guess, then see what DockMath's loading calculator says.
Uses the same packing logic as DockMath's container loading calculator, with every carton kept upright.
Coming first
Demurrage and detention calculator
Load a carrier's published terms, add your dates, and see your last free day and what each late day costs.
Container tracking lookup
Type a container number to find the shipping line that owns it and open its own tracking page.
Freight class calculator
LTL density class, checked against eight carriers' own measuring and capacity rules.
Container loading calculator
How many cartons or pallets fit in a 20', 40', 40' high cube or 45', with a 3D load plan.
Landed cost calculator
Product, freight, insurance, duty and US customs fees, down to the real cost per unit.
Free-time benchmark
What a container 14 days late costs under each carrier's terms at the main US ports, every month.