{"uid":"cap_o3BN7Zka2YNxuHPdjKytH","slug":"sitecheck-trade-energy-vessel-deadweight-tonnage-calculator-167c47fc","name":"SiteCheck Trade & Energy – Vessel Deadweight Tonnage Calculator","description":"Vessel displacement and deadweight estimate from hull dimensions: volume = length × beam × draught × block coefficient; displacement = volume × water density (sea 1.025, fresh 1.000 t/m³); deadweight = displacement − lightship weight (if given). Also returns the cargo capacity left after fuel, stores and ballast you enter. A design-stage estimate from standard formulas, not a vessel's official DWT; no ship registry lookup.","url":"https://api.tradeenergy-api.workers.dev/api/logistics/deadweight-tonnage-calc?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["lengthM","beamM","draughtM"],"properties":{"beamM":{"type":"string","description":"Moulded breadth in metres (required)"},"water":{"type":"string","description":"sea (default, 1.025 t/m³) or fresh (1.000 t/m³)"},"lengthM":{"type":"string","description":"Length between perpendiculars in metres (required)"},"draughtM":{"type":"string","description":"Draught in metres (required)"},"lightshipTonnes":{"type":"string","description":"Optional lightship weight in tonnes, to get deadweight"},"blockCoefficient":{"type":"string","description":"Block coefficient Cb, 0.35-0.90 (default 0.75; tankers/bulkers ~0.8-0.85, container ships ~0.6-0.7)"},"consumablesTonnes":{"type":"string","description":"Optional fuel, fresh water, stores and ballast on board, tonnes"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"note":"Estimate from hull dimensions; the official DWT is in the vessel's stability booklet / class records.","inputs":{"beamM":30,"lengthM":180,"draughtM":10,"blockCoefficient":0.8,"waterDensityTPerM3":1.025},"deadweightTonnes":35280,"displacementTonnes":44280,"underwaterVolumeM3":43200,"cargoCapacityTonnes":null}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3XH-xjcwuAggzjMFBft0u","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Estimates vessel displacement and deadweight tonnage from hull dimensions (length, beam, draught, block coefficient) using standard naval architecture formulas, with optional cargo capacity calculation.","exampleAgentPrompt":"Can you estimate the displacement and deadweight tonnage for a bulk carrier that's 180 metres long, 30 metres beam, 10 metres draught, with a block coefficient of 0.80 in seawater — lightship weight is 9000 tonnes and we have 500 tonnes of consumables on board?","exampleUseCases":[{"title":"Bulk carrier design stage DWT estimate","prompt":"I'm designing a Panamax bulk carrier — 225m length, 32.2m beam, 13.5m draught, block coefficient 0.83 in seawater. Lightship weight is 11500 tonnes. Can you estimate the displacement and available deadweight tonnage?"},{"title":"Container ship cargo capacity planning","prompt":"For a container ship 300m long, 42m beam, 14m draught with a block coefficient of 0.65 in seawater, lightship 22000 tonnes and 3000 tonnes of fuel and stores — what's the remaining cargo capacity?"},{"title":"River barge displacement in fresh water","prompt":"Can you work out the displacement for a river barge operating in fresh water — it's 90 metres long, 14 metres wide, 3.5 metres draught, with a block coefficient of 0.88?"}],"resultDescription":"Returns a JSON object with the computed underwater hull volume (m³), displacement in tonnes, deadweight tonnage (if lightship weight is provided), remaining cargo capacity (if consumables are provided), the water density used, and a note clarifying this is a design-stage estimate rather than an official DWT from class records.","failureModes":["Missing required parameters (lengthM, beamM, draughtM) returns an error","Block coefficient outside 0.35–0.90 range may yield unrealistic results","Lightship weight greater than displacement produces negative or null deadweight","Invalid numeric strings for dimension parameters cause parse errors","Omitting lightship weight means deadweight and cargo capacity return null"],"whenToPreferThis":"Use this endpoint when you need a quick, formula-based estimate of vessel displacement or deadweight at the design stage, feasibility study, or cargo planning phase — without access to official stability booklets or ship registries. Ideal for naval architecture calculations, freight capacity modelling, or logistics planning where only hull dimensions are known. Not suitable when official certified DWT from classification records is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T00:34:21.465Z","isFirstParty":false,"canonicalSlug":"sitecheck-trade-energy-vessel-deadweight-tonnage-calculator-167c47fc"}