LNG Calculator | Liquefied Natural Gas Unit Converter

LNG Composition & Energy Calculator

Calculate LNG density, heating value, and MMBtu based on composition and temperature.

LNG Volume (m³)

LNG Temperature (°C)

GCV Standard

Pressure (bar)

LNG Composition (mol %)

Component	Formula	Mole %
Methane	CH4
Ethane	C2H6
Propane	C3H8
i-Butane	i-C4H10
n-Butane	n-C4H10
i-Pentane	i-C5H12
n-Pentane	n-C5H12
n-Hexane	n-C6H14
Nitrogen	N2

Total: 100.000%

Calculation Methodology

This system implements the Revised Klosek-McKinley method as described in the GIIGNL Custody Transfer Handbook 6.0 and ISO 6578:2017.

Density & Volume: Calculated at liquid temperature using ISO-validated molar volume constants.

Energy Content (HHV): Calculated based on ISO 6976, allowing for user-defined combustion reference temperatures (e.g., 0°C, 15°C, or 25°C).

Precision: The algorithm maintains an uncertainty of ±0.1% within the standard composition limits (Nitrogen/Butane <5%).

Disclaimer: This tool is for demonstration and informational purposes. For commercial custody transfer, results must be verified against the specific Sale and Purchase Agreement (SPA) and calibrated instrumentation.