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Methane Emissions Reductions Calculator Conversion Factors

This page explains how the Methane Emissions Reductions Calculator inputs for methane volumes or energy are converted into carbon dioxide (CO2) equivalents.

Conversion Factors

The following conversion factors are used for the Methane Emissions Reductions Calculator.

Calculator Unit Conversion Factor
(Metric Tons CO2e)
Formula

Cubic feet (cf)

0.000479389

1 cf CH4 * (1 lb-mole/379.48 cf) * (16.0426 lb/1 lb-mole) * (1 Metric Ton/2,204.62 lb) * (25 CO2e/1 CH4) = 0.000479389 Metric Tons CO2e

Cubic meters

0.016929371049193

1 cubic meter CH4 * (35.31466 cf CH4/1 cubic meter CH4) * (1 lb-mole/379.48 cf) * (16.0426 lb/1 lb-mole) * (1 Metric Ton/2,204.62 lb) * (25 CO2e/1 CH4) = 0.016929371049193 Metric Tons CO2e

MMBtu

0.472490636704120

1 MMBtu CH4 *(106 Btu CH4/1 MMBtu) * (1 cf CH4/1,014.6 Btu) * (1 lb-mole/379.48 cf) * (16.0426 lb/1 lb-mole) * (1 Metric Ton/2,204.62 lb) * (25 CO2e/1 CH4) = 0.472490636704120 Metric Tons CO2e

Megajoule

0.000447621448803

1 Megajoule CH4 * (1 MMBtu/1055.87 MJ) *(106 Btu CH4/1 MMBtu) * (1 cf CH4/1,014.6 Btu) * (1 lb-mole/379.48 cf) * (16.0426 lb/1 lb-mole) * (1 Metric Ton/2,204.62 lb) * (25 CO2e/1 CH4) = 0.000447621448803 Metric Tons CO2e

Tonne carbon equivalent

3.664297125211160

1 Tonne Carbon equivalent CH4 * ([12.0107 + 31.9988] g/mole of CO2/12.0107 g/mole of Carbon) = 3.66419109627249 Metric Tons CO2e

Pounds CH4

0.011339815516791

1 lb CH4 * (1 Metric Tonne/2,204.62 lb) * (25 CO2e/1 CH4) = 0.011339815516791 Metric Tons CO2e

Tons CH4

22.679631033581400

1 Ton CH4 * (0.9071847 Metric Ton/1 Ton) * (25 CO2e/1 CH4) = 22.679631033581400 Metric Tons CO2e


Constants and Values

The following constants and values are used for the Methane Emissions Reductions Calculator.

Constants Value Source

Cubic feet per Cubic Meter

35.31466672

The National Institute of Standards and Technology Handbook 44 - 2012 Edition, Appendix C- General Tables of Units of Measurement (http://www.nist.gov/pml/wmd/h44-12.cfm)

Composite High Heating Value of Methane (BTU/Cubic Foot)

1,014.6

Coalbed Methane Outreach Program (CMOP), Interactive Units Converter (http://www.epa.gov/cmop/resources/converter.html)

Molecular Weight (MW) of Methane

16.04246

The National Institute of Standards and Technology, Atomic Weights (http://www.nist.gov/pml/data/comp.cfm)

Molecular Weight of Carbon

12.0107

The National Institute of Standards and Technology, Atomic Weights (http://www.nist.gov/pml/data/comp.cfm)

Molecular Weight of Carbon dioxide

44.0107

The National Institute of Standards and Technology, Atomic Weights (http://www.nist.gov/pml/data/comp.cfm)

MW of Carbon dioxide/MW of Carbon

3.664291007

The National Institute of Standards and Technology, Atomic Weights (http://www.nist.gov/pml/data/comp.cfm)

Cubic feet /lb-mole

379.48

The National Institute of Standards and Technology, Fundamental Physical Properties: Molar Volumes (Committee on Data for Science and Technology values for ideal gases)

lbs/Tonne

2,204.62

The National Institute of Standards and Technology Handbook 44 - 2012 Edition, Appendix C- General Tables of Units of Measurement (http://www.nist.gov/pml/wmd/h44-12.cfm)

lbs/Ton

2,000

The National Institute of Standards and Technology, Guide for the Use of International System of Units (SI)
(http://physics.nist.gov/cuu/pdf/sp811.pdf (PDF))

lbs/Kilogram

2.20462262

The National Institute of Standards and Technology Handbook 44 - 2012 Edition, Appendix C - General Tables of Units of Measurement (http://www.nist.gov/pml/wmd/h44-12.cfm)

Kilograms per Tonne

1,000

The National Institute of Standards and Technology, Guide for the Use of International System of Units (SI)
(http://physics.nist.gov/cuu/pdf/sp811.pdf (PDF))

Global Warming Potential (GWP) of Methane

25

EPA - 40 CFR 98 effective 1/1/2014, Page 21

1MMBTU per Mega joules

1,055.558526

Coalbed Methane Outreach Program (CMOP), Interactive Units Converter (http://www.epa.gov/cmop/resources/converter.html)

Abbreviations/Scientific Name:
cf – cubic foot
m3 – cubic meter
lb – pound
CH4 – methane
CO2e – carbon dioxide equivalent
MMBtu – 1 million British thermal units
Tonne – metric ton

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