Energy unit converter

Convert energy between kWh, Btu, kBtu, MMBtu, therms, dekatherms, MJ, GJ, kcal and ton-hours of cooling, with a table of common equivalents.

Energy

Formula

1\ \mathrm{kWh} = 3{,}412.14\ \mathrm{Btu} = 3.6\ \mathrm{MJ}

1\ \mathrm{therm} = 100{,}000\ \mathrm{Btu}

1\ \mathrm{MMBtu} = 1\ \mathrm{Dth} = 10\ \mathrm{therms}

1\ \mathrm{ton{\cdot}h} = 12{,}000\ \mathrm{Btu}

Common values

1 kWh = 3,412.14 Btu = 3.6 MJ
1 therm = 29.3071 kWh = 105.506 MJ
1 MMBtu = 293.071 kWh = 1.05506 GJ
1 GJ = 277.778 kWh = 0.947817 MMBtu
1 ton·h = 3.51685 kWh = 12.6607 MJ
1 kcal = 3.96832 Btu = 4.1868 kJ

Btu here is the International Table Btu (1,055.056 J). A US therm is 100,000 Btu, and a dekatherm (Dth) is 10 therms, the same as 1 MMBtu.

Natural gas is often metered by volume (ccf or Mcf). The bill shows a heat-content factor that turns volume into therms, so use that factor before you convert gas volume to energy.

Related calculators

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.

1,000	kWh kilowatt-hour
1	MWh megawatt-hour
3,412,140	Btu British thermal unit
3,412.14	kBtu thousand Btu
3.41214	MMBtu million Btu
34.1214	therm therm (100,000 Btu)
3.41214	Dth dekatherm (10 therms)
3,600,000	kJ kilojoule
3,600	MJ megajoule
3.6	GJ gigajoule
859,845	kcal kilocalorie
284.345	ton·h ton-hour of cooling (12,000 Btu)