Natural Gas BTU Calculator
Calculate energy content from gas composition.
Inputs
%
%
%
%
%
%
Mcf
Results
BTU per SCF
1,090 BTU
Total Energy
1,090.5 MMBtu
Specific Gravity0.66
Wobbe Index1,344
How to Use This Calculator
- Enter gas composition (mol% or vol%) for methane, ethane, propane, butane, and other components.
- Read gross heating value (BTU/scf) and net heating value (BTU/scf).
- Review Wobbe Index to assess gas interchangeability for burner appliances.
- Use heating value to calculate energy content of a gas stream in MMBtu/day.
- Compare calculated values against pipeline tariff gas quality specifications.
How the result changes with Methane (C1)
| Methane (C1) | BTU per SCF | Total Energy |
|---|---|---|
| 10 | 1,332 BTU | 1,332 MMBtu |
| 35 | 1,171 BTU | 1,171 MMBtu |
| 65 | 1,111 BTU | 1,110.63 MMBtu |
| 90 | 1,087 BTU | 1,086.67 MMBtu |
What each input means
- Methane (C1)
- Percentage of methane in the gas stream.
- Ethane (C2)
- Percentage of ethane.
- Propane (C3)
- Percentage of propane.
- Butane (C4)
- Percentage of butane.
- CO2
- Percentage of carbon dioxide.
- Nitrogen
- Percentage of nitrogen.
- Gas Volume
- Volume of gas in thousands of cubic feet.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMethane (C1) = 85, Ethane (C2) = 7, Propane (C3) = 3, Butane (C4) = 1 = 7 input(s) provided
- Calculate BTU per SCFBTU per SCF1090 = 1090
- Calculate Total EnergyTotal Energy1090.5 = 1090.5
- Calculate Specific GravitySpecific Gravity0.6588 = 0.6588
- Calculate Wobbe IndexWobbe Index1344 = 1344
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