Watts to BTU/hr Converter
Instantly convert electrical power in Watts (W) to heating and cooling capacity in British Thermal Units per hour (BTU/hr) for HVAC and appliance sizing.
Convert Watts to BTU/hr
Enter the electrical power in Watts. The calculator instantly works out the equivalent thermal energy transfer rate in British Thermal Units per hour (BTU/hr).
Power Conversion Calculator
Get instant, accurate BTU/hr figures from electrical Wattage.
Understanding Power Units
Key concepts for electrical and thermal energy
What is a Watt?
The Watt (W) is the standard SI unit of power. It represents the transfer of one joule of energy per second and is the universal standard for measuring electrical power consumption.
What is a BTU/hr?
A British Thermal Unit per hour (BTU/hr) is an imperial unit of power. One BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.
The Conversion Factor
The exact conversion is 1 Watt = 3.412142 BTU/hr. This constant is derived from the relationship between joules, seconds, pounds, and degrees Fahrenheit.
Real-World Efficiency
For resistive heating (like an electric kettle), 1,000W of electricity produces exactly 3,412 BTU/hr of heat. For heat pumps, 1,000W of electricity can move 10,000+ BTU/hr of heat.
Common Watts to BTU/hr Conversions
Standard power conversions for common household appliances and HVAC equipment. Use this as a quick lookup for capacity estimation.
| Power (Watts) | Equivalent (BTU/hr) | Power (Kilowatts) | Common Application |
|---|---|---|---|
| 100 W | 341 BTU/hr | 0.10 kW | Incandescent light bulb, small electronics |
| 500 W | 1,706 BTU/hr | 0.50 kW | Gaming desktop computer, small fan heater |
| 1,000 W | 3,412 BTU/hr | 1.00 kW | Microwave oven, standard space heater |
| 1,500 W | 5,118 BTU/hr | 1.50 kW | Maximum output of a standard 13A plug heater |
| 2,000 W | 6,824 BTU/hr | 2.00 kW | Large window AC unit (electrical input) |
| 3,000 W | 10,236 BTU/hr | 3.00 kW | Electric kettle, heavy-duty power tools |
| 5,000 W | 17,061 BTU/hr | 5.00 kW | Level 2 EV charger, small electric furnace |
| 10,000 W | 34,121 BTU/hr | 10.00 kW | Whole-house electric backup heater |
Power Conversion FAQ
Answers to the most frequently asked questions about converting electrical power to thermal capacity.
To convert watts to BTU per hour, multiply the power value in watts by 3.412142. For example, 1,000 watts is equal to 3,412.14 BTU/hr (1,000 × 3.412142 = 3,412.14).
A Watt (W) is the standard SI unit of power, representing one joule of energy transferred per second, commonly used for electrical devices. A BTU per hour (BTU/hr) is an imperial unit of power that measures the rate of heat energy transfer, widely used in heating, ventilation, and air conditioning (HVAC).
HVAC equipment is often rated in BTU/hr to indicate its heating or cooling capacity, while the electrical power it consumes is measured in Watts or kilowatts (kW). Converting between the two helps in sizing generators, calculating running costs, and understanding the Energy Efficiency Ratio (EER) of the unit.
No. This calculator performs a direct physical unit conversion (1 W = 3.412 BTU/hr). It does not account for the Coefficient of Performance (COP) or Energy Efficiency Ratio (EER) of heat pumps or air conditioners, which can move significantly more heat energy than the electrical energy they consume.
To convert BTU/hr to Watts, divide the BTU/hr value by 3.412142. For example, an air conditioner rated at 12,000 BTU/hr consumes approximately 3,516 Watts of electrical power if it were 100% efficient (12,000 ÷ 3.412142 = 3,516.85 W).