Accurate fuel gas properties are critical for the design, operation, and performance analysis of combustion systems, especially gas turbines. The METIS Power Gas Fuel Properties Calculator is a powerful and intuitive online tool designed for engineers and technicians. This calculator allows you to instantly determine key thermodynamic and physical properties of your specific gas mixture, including the Higher Heating Value (HHV), Lower Heating Value (LHV), Wobbe Index, density, and specific gravity. Simply enter your gas composition in mole or weight percent, specify your operating conditions in Imperial or SI units, and get precise results in seconds. With built-in presets for common fuels like Natural Gas and Syngas, and an advanced phase status check to warn of potential liquid dropout, this tool provides the essential data needed for reliable energy calculations and operational safety assessments.