Methane Number Calculator

Calculate the knock resistance of natural gas, biogas, biomethane, and hydrogen-containing gaseous fuels, expressed as calculated methane number (MN_C) according to ISO 17507-1:2025. The result is intended for comparison, evaluation, and technical review. Please read the disclaimer before relying on any result.

Enter the gas composition as volume, mole, or mass fractions. Empty fields are treated as zero. The entered fractions are converted to volume fractions and normalized to percent before the ISO 17507-1:2025 calculation is performed.