Watts to BTU Calculator
Convert Power Units
Convert between electrical power (watts) and thermal energy (BTU) units. This calculator is perfect for sizing electrical heating equipment, comparing energy efficiency, and understanding power consumption.
How Watts to BTU Calculator Works
Watts measure electrical power, while BTUs measure thermal energy. The conversion between these units is essential for understanding energy efficiency in heating and cooling equipment.
Conversion Factors
1 Watt = 3.412 BTU/hour
1 BTU/hour = 0.293 Watts
1 Kilowatt = 3,412 BTU/hour
1 Horsepower = 745.7 Watts
Common Applications
- Electric Heating: Calculating heat output from electric heaters and baseboard units
- HVAC Equipment: Converting electrical input to thermal output for heat pumps
- Energy Efficiency: Comparing electrical consumption to heat production
- Equipment Sizing: Matching electrical capacity to heating/cooling needs
- Cost Analysis: Understanding operating costs based on power consumption
Power Units Explained
- Watt (W): SI unit of power equal to 1 joule per second
- Kilowatt (kW): 1,000 watts of electrical power
- BTU/hour: British thermal unit per hour (thermal power)
- Horsepower (hp): Traditional unit of power (745.7 watts)
- BTU: Amount of energy needed to heat 1 pound of water by 1°F
Practical Examples
- A 1,500W space heater produces 5,118 BTU/hour of heat
- A 100W light bulb generates 341 BTU/hour
- A 3,000W electric baseboard heater outputs 10,236 BTU/hour
- A 750W microwave produces about 2,559 BTU/hour when running
Energy Efficiency Considerations
- Electric resistance heating is 100% efficient at converting watts to BTUs
- Heat pumps can produce 2-4 times more BTUs than their watt consumption
- Understanding this conversion helps evaluate heating system efficiency
- Compare different heating methods using consistent BTU output measurements
Cite this page as:
Daniel, P. Watts to BTU Calculator. Available at: https://constructioncalculators.com/watts-to-btu-calculator/. Accessed: October 25, 2026.