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Natural Gas Properties & Heating Value Calculator

Calculate natural gas molecular weight, specific gravity, compressibility factor, density, gross calorific value and net calorific value based on gas composition.

01 Base Condition

Base Pressure

psia

Base Temperature

°F

02 Operating Condition

Operating Pressure

psig

Operating Temperature

°F

03 Gas Composition

Methane (CH₄)

mol%

Ethane (C₂H₆)

mol%

Propane (C₃H₈)

mol%

n-Butane (C₄H₁₀)

mol%

i-Butane (C₄H₁₀)

mol%

n-Pentane (C₅H₁₂)

mol%

i-Pentane (C₅H₁₂)

mol%

neo-Pentane (C₅H₁₂)

mol%

n-Hexane (C₆H₁₄)

mol%

n-Heptane (C₇H₁₆)

mol%

n-Octane (C₈H₁₈)

mol%

Nitrogen (N₂)

mol%

Oxygen (O₂)

mol%

Carbon Dioxide (CO₂)

mol%

Carbon Monoxide (CO)

mol%

Helium (He)

mol%

Hydrogen (H₂)

mol%

Hydrogen Sulphide (H₂S)

mol%

Total Gas Composition 0.00 mol%

04 Calculation Results

Molecular Weight

—

kg/kmol

Specific Gravity

—

Air = 1

Compressibility Factor — Base

—

Zb

Compressibility Factor — Flowing

—

Zf

Density — Base Condition

—

kg/m³

Density — Base Condition

—

lb/ft³

Density — Flowing Condition

—

kg/m³

Density — Flowing Condition

—

lb/ft³

Gross Calorific Value

—

Btu/ft³

Net Calorific Value

—

Btu/ft³

Gross Calorific Value

—

kcal/m³

Net Calorific Value

—

kcal/m³

Gross Calorific Value

—

kJ/m³

Net Calorific Value

—

kJ/m³

Compressibility factor is calculated using the AGA NX-19 methodology. Density is calculated using molecular weight, pressure, temperature and the corresponding compressibility factor.

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