Appendix G
Unit Conversion Factors and Energy Ratings

CONVERSION FACTORS

1 Btu [British thermal unit] = 1.055 kJ [kilojoules] = 252 cal [calories]

1 cal = 0.003967 Btu = 4.184 J

1 quad [quadrillion Btu] = 1015 Btu

1 Btu/lb = 0.556 kcal/kg

ENERGY RATINGS

1 tce [tonne of coal equivalent] = 29.308 GJ = 27.778 million Btu

1 toe [tonne of oil equivalent] = 41.868 GJ = 39.683 million Btu

“Coal equivalent” coal = 7,000 kcal/kg

High-rank coal = 7,000 kcal/kg

Low-rank coal = 3,500 kcal/kg

Lignite = 2,700 kcal/kg

1 ton lignite = 0.3 to 0.63 tce (average 0.38)

1 ton subbituminous = 0.78 tce



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Coal Research and Development: to Support National Energy Policy Appendix G Unit Conversion Factors and Energy Ratings CONVERSION FACTORS 1 Btu [British thermal unit] = 1.055 kJ [kilojoules] = 252 cal [calories] 1 cal = 0.003967 Btu = 4.184 J 1 quad [quadrillion Btu] = 1015 Btu 1 Btu/lb = 0.556 kcal/kg ENERGY RATINGS 1 tce [tonne of coal equivalent] = 29.308 GJ = 27.778 million Btu 1 toe [tonne of oil equivalent] = 41.868 GJ = 39.683 million Btu “Coal equivalent” coal = 7,000 kcal/kg High-rank coal = 7,000 kcal/kg Low-rank coal = 3,500 kcal/kg Lignite = 2,700 kcal/kg 1 ton lignite = 0.3 to 0.63 tce (average 0.38) 1 ton subbituminous = 0.78 tce