Containers and logistics
Stuffing math for cartons and drums, ISO tank loading under IMDG 4.2.1.9, surcharge decoding, and demurrage and detention calculation by carrier.
- ISO 668 · CapacityLive
Container loading calculator
Compute how many drums, IBCs, big bags, or paper-bag pallets fit a 20GP, 40GP, 40HC, or reefer container, weight-out vs cube-out.
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- IMDG 4.2.1.9 · TankLive
ISO tank loading calculator
Maximum loadable volume and mass for any ISO tank build (T1 through T22 plus T23, T50, T75) under the IMDG 4.2.1.9 fill rules.
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- ISO 668 · ReferenceLive
Shipping container dimensions
20GP, 40GP, 40HC, 20RF, 40RH, 20OT, 20FR, 20TK internal dimensions, payload, door opening, and use cases in one reference table.
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- EFTCO · CleaningLive
Tank cleaning code lookup
EFTCO cleaning code letters A-J decoded with typical USD ranges, plus compatibility table for 8 common chemical-trade transitions (NaOH to H2SO4, methanol to ethanol, FAME to diesel, phenol cleanup, food-grade after industrial).
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- D and DLive
Demurrage and detention calculator
3-tier stepped tariff D&D math: free time + tier-1 + tier-2 + tier-3 escalation across N containers. Returns per-tier breakdown and total.
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- Surcharge refLive
Surcharge decoder
Plain English on BAF, EBS, CAF, GRI, PSS, ISPS, THC, ISOCC, AMS, ENS, AFR, ICS2, D&D and CRS on an ocean freight invoice.
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- CBM · Container fillLive
CBM calculator
Carton size and count in inches or centimeters to CBM, cubic feet and total weight, with how full a 20 ft, 40 ft and 40 ft high cube container gets on ONE inside dimensions.
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- NMFC · DensityLive
Freight class calculator
Pallet size and weight to density in pounds per cubic foot and the NMFC class on the NMFTA 13 subprovision density scale in force since July 19, 2025.
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- Pallets · 53 ftLive
Pallet calculator
Boxes per layer and per pallet under your height limit, then pallets per 20 ft and 40 ft container and 53 ft trailer, with the door height checked.
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- ISO 6346 · BICLive
Container number check digit validator
Type a container number and validate its ISO 6346 check digit, with the owner code, equipment category and serial number explained.
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- 23 CFR 658.17 · NHVR GMLLive
Container road weight limit calculator
Container, tractor and chassis tare give the maximum legal cargo under the US 80,000 lb, axle and Federal Bridge Formula limits in 23 CFR 658.17, or Australian General Mass Limits, with a drum or IBC count.
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- WMO-No. 8 Annex 4.BLive
Container desiccant calculator
Stuffing climate, coldest temperature, pallets and paper packaging give the water a container can release, using the WMO Magnus formula, and the kilograms of desiccant capacity needed to stop container rain.
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- CBP CTPAT · 7 pointLive
7 point container inspection checklist (CTPAT)
A printable CTPAT inspection sheet laid out on the CBP 7 point checklist, with the 8 point reefer and 17 point tractor and trailer lists, seal numbers, the VVTT seal check and photo ticks for the loading factory to sign.
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Sourzi shows what official files say. It is not customs or legal advice. For a binding answer, ask a licensed customs broker, a CBP ruling or an Australian Border Force Tariff Advice.
File dates and links are on Data sources.