1. What is Watts to BTU Conversion?

The conversion between watts and British Thermal Units per hour (BTU/hr) is a fundamental calculation in energy and power systems. It allows comparison between electrical power (watts) and thermal energy (BTU).

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( Q \) — BTU per hour (BTU/hr)
• \( W \) — Power in watts (W)
• 3.412142 — Conversion factor (1 W = 3.412142 BTU/hr)

Explanation: This conversion factor comes from the exact definition that 1 watt equals 3.412142 BTU per hour.

3. Practical Applications

Details: This conversion is essential for HVAC system sizing, electrical-to-thermal energy calculations, and comparing heating/cooling capacities across different unit systems.

4. Using the Calculator

Tips: Simply enter the power value in watts. The calculator will instantly provide the equivalent value in BTU per hour.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 3.412142?
A: This exact value comes from the definition of BTU as the energy needed to raise 1 pound of water by 1°F, and the precise relationship between joules (watts) and this thermal energy.

Q2: Is this conversion reversible?
A: Yes, to convert BTU/hr to watts, divide by 3.412142 (W = Q/3.412142).

Q3: How accurate is this conversion?
A: The conversion is mathematically exact, though practical measurements may have instrument-related uncertainties.

Q4: Does this apply to all types of watts?
A: Yes, whether electrical, mechanical, or thermal watts, the conversion to BTU/hr remains the same as it's based on energy equivalence.

Q5: Why is this useful in HVAC?
A: HVAC equipment capacities are often rated in BTU/hr while electrical consumption is in watts, making this conversion essential for system design and energy efficiency calculations.