Featured calculator
CII Attained Calculator
Compute a ship's attained Carbon Intensity Indicator under MEPC.336(76).
ShipCalculators.com: maritime reference
Regulation-referenced maritime calculators and encyclopedia
Free, embeddable, regulation-cited calculators for IMO EEDI / EEXI / CII, EU ETS, FuelEU Maritime, MARPOL Annex VI, IBC and IMSBC schedules, and class-society notations. Paired with a maritime-industry wiki. Every calculator shows the formula it implements and cites the exact MEPC resolution, EU article, or class circular.
500+ wiki articles · 3000+ live calculators
IMO: Design phase
EEDI, EEXI, EPL, ShaPoLi, and the design-phase indices regulated under MARPOL Annex VI Chapter 4.
IMO: Operational
Annual carbon-intensity rating, the IMO DCS reporting framework, and the operational efficiency indices.
EU and UK regulatory
EU ETS allowance liability, FuelEU Maritime GHG-intensity, and the WtW fuel pathways behind both regimes.
Marine fuels
Properties, regulation, and the energy-transition pathways for the fuels burned by the world fleet.
Conventions and class
SOLAS, MARPOL, the IBC and IMSBC codes, IMDG, and the class-society unified requirements: per-regulation entry points.
Wiki encyclopedia
Plain-language explainers and reference articles on the regulations, ship types, and engineering systems behind the calculators.