ShipCalculators.com

About ShipCalculators.com

A regulation-cited maritime reference, free for everyone

ShipCalculators.com is a continuously expanding library of maritime calculators, formula references, and long-form encyclopedia articles. Every formula traces back to its exact MEPC resolution, EU article, or class-society circular. No login, no tracking beyond aggregate analytics, no data leaving the browser.

How we work

Every formula is regulation-cited

Each calculator on the site shows its formula in plain text, links to the underlying formula reference at /docs, and cites the regulatory source — IMO MEPC resolution, EU MRV/ETS article, MARPOL Annex VI provision, or class-society notation document. Nothing hidden behind a black box.

Browse the formula reference →

Methodology

Every calculator is built from the regulation outwards.

  • Formula cited to the exact MEPC resolution, EU article, or class circular.
  • Formula shown in the UI — never hidden behind a black box.
  • Default values explicit; conservative simplifications flagged.
  • Source documents linked from the formula reference at /docs.

Coverage

From IMO design phase through EU regulatory regimes to class-society notations.

  • IMO design phase: EEDI, EEXI, EPL, ShaPoLi, minimum propulsion power.
  • IMO operational: CII, AER, EEOI, cgDIST, SEEMP, IMO DCS.
  • EU/UK regulatory: EU MRV, EU ETS, FuelEU Maritime, UK ETS, CARB, Norway NOx Fund.
  • Well-to-wake fuel pathways, NOx Tier I/II/III, ECA premiums, class-society notations.

Audience

Built for everyone working near IMO, EU, or class-society rules.

  • Ship operators and technical superintendents.
  • Naval architects and design teams.
  • Charterers and commercial managers.
  • Sustainability and ESG analysts.
  • Maritime academy students and educators.
  • Class-society and flag-administration staff.

Limits

What these calculators are not.

  • Not a substitute for verification by a classification society.
  • Not a substitute for a flag-administration filing.
  • Not an authoritative source for regulatory submissions — always cross-check with current consolidated text.
  • Use certified BDN values for compliance reporting, not rules-of-thumb.
  • Built for education, first-pass analysis, and operational sense-checks.

Start exploring