BTU to Watt-Hours (Wh) Converter
Enter a value to instantly convert between energy units.
1 BTU (IT) = 0.2931 Watt-Hour
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
Wh = BTU × 0.293071One BTU (IT) equals 0.293071 watt-hours. Since 1 BTU = 1055.056 joules and 1 watt-hour = 3600 joules, the conversion is 1055.056 ÷ 3600 = 0.293 Wh. This is essential for comparing heating systems to electrical alternatives, understanding furnace efficiency ratings, and calculating energy costs when switching between fuel types and electricity.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
An energy auditor comparing 1 BTU thermal heat to 0.293 Wh electrical equivalent.
1 BTU = 0.293071 Wh
Window air conditioner rated 10,000 BTU/h removes 2.93 kWh of heat per hour from the room.
10000 BTU = 2930.71 Wh
A large residential furnace rated 100,000 BTU/h = 29.3 kW equivalent for sizing electric heating replacement.
100000 BTU = 29307.1 Wh
Space heater producing 5000 BTU/h = 1.465 kWh heat per hour for electrical equivalent cost calculation.
5000 BTU = 1465.355 Wh