Watt-Hours (Wh) to BTU (IT) Converter
Enter a value to instantly convert between energy units.
1 Watt-Hour = 3.4121 BTU (IT)
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
BTU = Wh × 3.41214One watt-hour equals 3.412 BTU. Since 1 Wh = 3600 J and 1 BTU = 1055 J, the conversion is 3600/1055 = 3.412 BTU per Wh. This is useful when comparing electrical energy to heating values — 1 kWh = 3412 BTU, about the heat output of a small space heater for 3-4 hours.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A homeowner comparing 1 Wh of electricity to heating — 3.41 BTU for the energy audit.
1 Wh = 3.412 BTU
A data center using 100 Wh per hour calculates 341 BTU/h of heat for the cooling system.
100 Wh = 341.21 BTU
An HVAC engineer calculating 50 Wh of fan energy produces 170.6 BTU of heat for the load.
50 Wh = 170.61 BTU
A solar panel generating 1000 Wh/day produces 3412 BTU equivalent for the energy report.
1000 Wh = 3412.14 BTU