CO₂ Emission Estimator

CO₂ Emission Estimator for Marine Fuels

The CO₂ Emission Estimator calculates carbon dioxide emissions from marine fuel consumption using fuel-specific emission factors expressed in tonnes of CO₂ per tonne of fuel. It is designed for ship operators, marine engineers, and students who need quick, transparent emission estimates aligned with IMO methodologies.

Supported Calculation Methods

This calculator provides three independent calculation routes, allowing you to work with the data you already have:

• Total Fuel Method — Estimate CO₂ emissions from a known total fuel quantity. Multiple fuel types can be combined to model bunker mixes, with automatic weighted emission factors.
• Daily Consumption Method — Calculate emissions from a daily fuel rate multiplied by voyage duration in days and hours.
• SFOC & Power Method — Derive fuel consumption from specific fuel oil consumption (SFOC), engine power, and operating time, then convert to CO₂ emissions.

Fuel Presets & Emission Factors

Built-in fuel presets include common marine fuels such as VLSFO, HFO, MGO, LNG, methanol, and ammonia. Each preset provides typical density and default emission factors, which can be overridden for contractual, laboratory, or regulatory values.

Emission factors follow the general IMO definition:

CO₂ = Fuel Consumed × Emission Factor

Mixed Fuel & Weighted Emissions

When multiple fuels are used, the calculator computes total emissions by summing each fuel component individually and reporting a weighted average emission factor based on fuel mass. This is particularly useful for bunkering operations involving blended fuels or fuel switching scenarios.

Typical Use Cases

• Voyage-level CO₂ emission estimates
• EU MRV and IMO DCS pre-checks
• Fuel comparison studies (HFO vs LNG vs methanol)
• Emission benchmarking based on engine SFOC
• Training and academic calculations

Accuracy & Scope

This tool estimates tank-to-wake CO₂ emissions. It does not include upstream (well-to-tank) emissions, methane slip, or lifecycle greenhouse gas effects unless explicitly modeled by the user through custom emission factors.

Results should be used for preliminary analysis and reporting support. For regulatory submissions, always verify values against approved fuel delivery notes and official emission factors.

Related tools: Fuel Consumption Calculator, SFOC Calculator, EEOI Estimator, Fuel Cost Calculator