What is carbon costing your ships?

Find what carbon costs each ship, see why, and see what would cut it.

EU ETS, FuelEU and your CII rating, from emissions already on the public record.

No ship in mind?
17,386ships in the public register
4,285shipping companies behind them
86.2 Mtof CO₂ in EU ETS scope in 2025
€7.3 bna year at €85 a tonne under the 2026 rules
Start here

One page that tells you what to do about a ship’s carbon cost.

The ship decision report answers the six questions owners ask first, in euros, with how sure each figure is.

See a sample report Start a pilot on one ship

The pilot: we redo the report on your noon reports and your verifier’s figures, and reconcile every difference. One ship, fee agreed on a short call. How we check our figures

  1. What does carbon cost this ship?This year, and the same year on next year’s rules
  2. Which rules create the cost?EU ETS, FuelEU Maritime, UK ETS, the CII rating
  3. What are the three best options?Ranked by money saved a year
  4. What do they save and cost?Fuel, carbon, extra days at sea, payback
  5. How sure is each figure?Measured, estimated or missing, said plainly
  6. What would make it certain?The documents that turn the estimate into your figures
Everything we do

From one ship’s bill to every owner’s surrender.

The tools ship managers reach for first, in the order this year’s deadlines ask for them.

How it works

From an IMO number to the carbon cost of the ship.

What each regulation costs a ship in euros, from the public record, and what would move it.

1

Type a ship

A name or an IMO number. That is all we ask for.

2

See the bill

ETS, FuelEU and the CII rating, added up in euros.

3

Decide

See which lever moves it most, and how the limit tightens.

Last year’s numbers, this year’s bill

The public record is a rear-view mirror.

The instant check uses verified emissions published a year late: a fair start, not what you owe today.

1

Published a year late

A year’s verified emissions are made public by 30 June of the following year. Until then, this year’s exposure does not appear anywhere.

2

The rules have moved on

2026 is the first year at 100% of EU emissions, with methane and nitrous oxide counted, and the UK ETS covers shipping from 1 July 2026. Last year’s filing understates this year’s bill.

3

Your fleet has changed

Fuel mix, speed, routes, charters and the ships you bought or sold since the last filing are not in the register, and the public record gives only a fuel total, from which the mix has to be inferred.

Want the analysis for this year? That is the part we do with you: your noon reports and bunker delivery notes, this year’s rules, your pool and charter terms, turned into the position you will actually settle.

Ask for this year’s analysis Try it with your own figures
What comes back

Know what each ship costs, why, and what would cut it.

A mid-size ship can carry a six-figure carbon bill a year. Here is one, from problem to action.

Bulk carrier, about 65,000 dwt
Carbon cost of its 2025 emissions
€581k
EU ETS €441k+ FuelEU €140k
FuelEU deficit pooled instead of paying the penalty: €465k in total
Same operation under the 2026 rules (100% surrendered): €780k
CII rating, 2025
E
6.29 against a required 4.28
EEXI
Pass
22% under the required value
Where this ship sits in 2025A is best
A
B
C
D
E
▲ this ship
Rating each year with both changes below; E every year without them
2025C
2026C
2027C
2028D
2029D
2030D
€

Allowances you buy anyway

100% of EU-scope emissions from 2026, and methane and nitrous oxide now count too.

⛽

A fuel shortfall you may not have counted

Heavy fuel oil sits above the FuelEU limit, so a charge builds all year.

↘

A rating that slips on its own

The CII limit tightens every year: a ship that does nothing falls a band every few years.

€422k average EU ETS cost per ship in the register at the full 2026 rate and €85 a tonne, offshore ships excluded
Book a demo Check your own ship

Three ways to cut it, gross and net

ChangeCarbon costFuel costNet a yearTime at seaCII 2025
Sail 10% slower−€88k−€379k−€467k+11%E (5.31)
Hull and propeller cleaning, trim4% and 1.5% less main-engine fuel−€27k−€116k−€143knoneE (5.99)
20% certified biofuel−€228k+€780k+€552knoneD (5.03)
10% slower and 20% biofuel−€282k+€281kabout €0+11%C (4.25)
Sail slowerPays for itselfif the schedule and charter allow 11% more time at sea
Clean the hull and propellerPays for itselfwith no time lost
Burn biofuelCuts carbon most, costs morepays only below about €180 a tonne above fossil fuel, or when the charterer pays
  • Fuel €550 a tonne
  • Certified biofuel €1,300 a tonne
  • EU allowance €85
  • FuelEU pool €110 a tonne
  • A real ship’s 2025 public filing, not named; a model, not a measured result
  • Run it on your own ship
How we get to the number

Follow one answer from source to decision

Public data in, the rulebooks applied, checked against your verifier, out as euros.

N
Step 1 · Where the data comes from

We start from the public record.

Every ship over 5,000 GT calling at EU ports is listed in a register EMSA publishes under the EU emissions register every year. We load all 17,386 of them, so you type nothing.

EMSA THETIS-MRV · verified emissions
Step 2 · What we apply

We apply the rulebooks, line by line.

EU ETS, UK ETS, FuelEU Maritime and the IMO’s CII and EEXI, each coded from the regulation text. Plain calculations you can check, with every factor cited.

IMO resolutions · EU regulations
Step 3 · Your verifier’s figure

We check ourselves against your verifier.

The bill uses the EU ETS figure your verifier reported for the ship, so the starting point is the number your company will be held to.

Measured, not promised
Step 4 · What you get

We turn it into a decision.

Euros, a rating, and the lever that moves it. A public-data estimate until you send your own data; then a customer-data calculation, prepared for review against your verifier’s figures.

Open the worksheet behind every figure
What we do

Every carbon rule that touches a ship, in one place.

Ranked the way we would work through them: money first, design checks last.

1Cash, every year

EU ETS and UK ETS

Allowances you surrender. From 2026 it is 100% of EU-scope emissions, methane and nitrous oxide included.

2Cash, and a limit that falls

FuelEU Maritime

How far your fuel’s greenhouse-gas intensity sits above the limit, and what the shortfall is charged at.

3Tighter every year to 2030

CII rating

An A to E grade against a limit that drops each year. Three years at D, or one at E, needs a corrective plan.

4Mostly settled

EEXI

A one-off design check most ships cleared in 2023. It matters again for newbuildings, conversions and power-limit changes.

+Your whole fleet

Fleet view

Paste a list of IMO numbers. Get one total, a ranking of your ships, and a drill-down into each.

+Never miss a date

Deadlines and worksheets

A compliance calendar for Outlook or Google, and a full worksheet your verifier can follow.

Why CarbonKeel

Where we are strongest.

Five things we are built to do well, and can show you.

Results in seconds

All 17,386 ships are already loaded. Type a name and the answer is on screen.

No upload, no account

Every figure traceable

Every figure opens a full worksheet, each factor tied to a named regulation.

Built for your verifier

Honest about limits

Anything rebuilt from public data is marked as an estimate, and shows how it compares with the verifier.

About 2 in 3 ships match to the tonne

Four rulebooks, one number

ETS, UK ETS, FuelEU and CII added up on one screen, not four spreadsheets.

In euros, for any ship trading into Europe

Your data stays yours

Nothing to upload to start. No advertising trackers, and no cookies except the sign-in cookie of your account.

Ship results are not search-indexed
MOHA – Emission Management

Every owner’s MOHA. One status board.

What each owner’s MOHA owes, has funded and signed off: admin, performance and finance on one screen.

Status board: ships in scope, allowances to surrender, share funded, and every MOHA placed in its stage, from owner data to closed
Where every MOHA stands, from the owner’s data to the surrender, with the dates each team works to.

Made-up companies and ships. MOHA is the Maritime Operator Holding Account each shipping company holds for its EU allowances.

Want to know more?Book a demo and we walk you through it on your own owners, ships and MOHAs.
Book a demo
Talk to us

Ask about a number, the method or your fleet.

Every message is read and answered by email, usually within one working day.

Send us your fleet and we will work out what it costs

Give us your IMO numbers and we will come back with the whole fleet costed. If you would rather ask a question first, that is fine too.

Sent to us and kept as the privacy notice says. Or write to enquiry@carbonkeel.com.

Book a 30-minute demo Email enquiry@carbonkeel.com Check a ship yourself

Calculators and guides

Every rule a ship trading into Europe pays for, with the formula and a calculator to try.

CII calculatorThe required CII tightens every year, to 21.5% below the 2019 line by 2030. Where does your ship land?Open →EU ETS calculatorFrom 2026 ships surrender 100% of their allowances, and methane and nitrous oxide count too.Open →FuelEU Maritime calculatorA ship on heavy fuel oil is above the 2025 target before it leaves port: 91.74 against 89.34 gCO₂e/MJ.Open →FuelEU poolingA deficit paid as a penalty costs about €640 per tonne of CO₂e. Pooled, it can cost a fraction of that.Open →SEEMP Part IIIRated E, or D three years running? The corrective action plan is due within a month of reporting.Open →UK ETS maritimeDomestic voyages have been in the UK ETS since 1 July 2026. The first allowances are due in April 2028.Open →IMO Net-Zero FrameworkNot adopted yet. If it is, a ship on heavy fuel oil would pay remedial units from 2028.Open →Ship emissions lookupSearch 17,000 ships by name or IMO number: what each emitted, and what it means in euros.Open →

All calculators and guides

Stop guessing what carbon costs your ships.

Start with one ship: in ten seconds you will know whether anything here is worth your time.