Heat Rate Converter
Instantly convert heat rate with our free converter. See conversion tables, formulas, and step-by-step explanations. Includes formulas and worked examples.
Formula
Converted Value = Input Value x (From Unit Factor / To Unit Factor)
Heat rate conversion uses watts as the base unit. Each unit has a known factor relative to watts. For instance, 1 BTU/h = 0.29307 W and 1 ton of refrigeration = 3,516.853 W. To convert, multiply the input by its factor to get watts, then divide by the target unit factor to get the result.
Worked Examples
Example 1: HVAC System Conversion
Problem: An air conditioning unit is rated at 36,000 BTU/h. Convert to kilowatts and tons of refrigeration.
Solution: To kW: 36,000 BTU/h x 0.29307107 W per BTU/h = 10,550.6 W = 10.55 kW\nTo TR: 36,000 / 12,000 = 3.0 tons of refrigeration
Result: 36,000 BTU/h = 10.55 kW = 3.0 TR
Example 2: Boiler Rating Conversion
Problem: A steam boiler is rated at 5 boiler horsepower. What is this in kW and BTU/h?
Solution: To watts: 5 x 9,809.5 = 49,047.5 W = 49.05 kW\nTo BTU/h: 49,047.5 / 0.29307107 = 167,375 BTU/h\nAlternatively: 5 x 33,475 = 167,375 BTU/h
Result: 5 boiler HP = 49.05 kW = 167,375 BTU/h
Frequently Asked Questions
What is heat rate and how is it measured?
Heat rate is the rate of thermal energy transfer per unit of time. It is essentially thermal power and is measured in watts (W) in the SI system. In HVAC and power generation, BTU per hour is commonly used. Heat rate in power plants specifically refers to the amount of fuel energy required to generate one kilowatt-hour of electricity, typically expressed as BTU/kWh. Lower heat rates indicate higher efficiency.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
Can I use the results for professional or academic purposes?
You may use the results for reference and educational purposes. For professional reports, academic papers, or critical decisions, we recommend verifying outputs against peer-reviewed sources or consulting a qualified expert in the relevant field.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
Can I share or bookmark my calculation?
You can bookmark the calculator page in your browser. Many calculators also display a shareable result summary you can copy. The page URL stays the same so returning to it will bring you back to the same tool.
What formula does Heat Rate Converter use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.