ISO 17507-2:2025 · PKI method

PKI Methane Number Calculator

Enter the complete gas composition by volume, mole, or mass. The composition is converted according to ISO 14912:2025 and prepared for calculation using the PKI method in ISO 17507-2:2025. The result is calculated when you select Calculate. Read the disclaimer before relying on a result.

Method · Validation

Input

Input help
Input basis
Input scale

Enter percentages totalling 100.

ComponentFormulaInput (%)
MethaneCH4
EthaneC2H6
PropaneC3H8
n-ButaneC4H10
IsobutaneC4H10
n-PentaneC5H12
IsopentaneC5H12
NeopentaneC5H12
n-HexaneAlso used for Hexanes+C6H14
NitrogenN2
Carbon dioxideCO2
HydrogenH2
Carbon monoxideCO
Hydrogen sulfideH2S
Entered total0

Input

Input basis
Mole
Input scale
Percent
ComponentFormulaInput (%)
Entered total0

Result

Complete the composition and select Calculate to see the result.