How to calculate the CII?
A simple calculation example for Carbon Intensity Indicator (CII)
How to calculate the CII of your vessel
The formula for calculating the CII is set out in IMO regulation MEPC.336(76). This page shows a simple calculation example.
The example
Assume a ship sailed 11,756.00 NM and burns 400 mt of Heavy Fuel Oil (HFO) in one year.
| HFO Consumption |
| 400 mt |
| Fuel oil mass to CO2 mass conversion factor – see MEPC 308(73) 2.2.1 CF ; Conversion factor between fuel consumption and CO2 emission |
| 3.114 |
| Mass of CO2 emissions M = Consumption x factor |
| 1,245.60 mt |
| Mass of CO2 emissions (M) in grams |
| 1,245,600,000.00 g |
The transport work
The transport work is the amount of cargo it has carried multiplied by the distance it has sailed
| Ship’s capacity (C) – For bulk carriers, tankers, container ships, gas carriers, LNG carriers, general cargo ships, refrigerated cargo carrier and combination carriers, deadweight tonnage (DWT) should be used as capacity. |
| 8,096.00 mt |
| Distance travelled (D) – total distance travelled (in nautical miles), as reported under IMO DCS. |
| 11,756.00 NM |
| Transport work (W) W = C x D |
| 95,176,576.00 NM mt |
The Attained CII
The attained CII is the carbon emissions relative to the transport work performed over a given period, typically a year.
| Attained CII CII = M / W |
| 13,09 g CO2/NM mt |
Note: This sample calculation is provided without guarantee. We strongly recommend that you consult the regulations and publications of the IMO.
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