Reference Values for Marine Fuels

This page provides key fuel density data (at 15 °C) for various marine fuels used in energy-equivalence and volume-to-mass calculations. These values are essential inputs for converting between energy content, mass, and volume in the Fuel Equivalence Converter and related tools.

The fuel convertor tool provides high-level estimates and comparisons only and should not be relied on for compliance or legal purposes.

Fuel Density kg/m3 (at 15°C) Density kg/m3 Range Sources
HFO 991 900 – 1,000

ING

 

International Registries
LSFO Crude

950

 900 – 1,000 PAME
LSFO Blend 950 900 – 1,000 PAME
ULSFO 900 850 – 950 PAME
VLSFO 991 900 – 1,000 ING
LFO 840 820 – 860 PAME
MDO_MGO 991 900 – 1,000 ING
LNG 450 N/a International Registries
NH3 840 N/a ING
Methanol 794 N/a IEA Bioenergy

About this data

  • Densities are specified at 15 °C, a standard reference temperature for marine fuel measurement.

  • Ranges are included to reflect variability due to fuel grade, blending, and supplier sources.

  • Data is drawn from credible sources such as ING, International Registries, and IEA Bioenergy.

     

How to use these values

These densities are used by the Fuel Equivalence Converter to:

  • Convert mass (tonnes) to volume (m³)—helpful for bunker planning and storage assessments.

  • Support energy-equivalence calculations, enabling users to understand how much alternative fuel is required to match the energy of conventional fuels.

  • Compare vessel fuel usage against standard baselines (e.g., Marine Fuel Oil daily consumption).