## About Thermal Efficiency Calculator (Formula)

The thermal efficiency of a system is a measure of how efficiently it converts heat energy into useful work. It is commonly used in thermodynamics and engineering to assess the performance of engines, power plants, and other heat-based systems. The formula for calculating thermal efficiency is:

**Thermal Efficiency (ηth) = (Useful Work Output) / (Heat Input)**

Where:

- ηth represents the thermal efficiency (usually expressed as a percentage).
- Useful Work Output is the actual work done by the system, often measured in joules (J) or other units of energy.
- Heat Input is the total heat energy supplied to the system, also measured in joules (J) or other units of energy.

To express the thermal efficiency as a percentage, you can multiply the result by 100.

In the context of the HTML calculator examples provided earlier, the “Workout Output” corresponds to the Useful Work Output (W), and the “Heat Input” corresponds to the Heat Input (Q) in the formula. When you enter values for these variables and click the “Calculate Efficiency” button, the JavaScript function calculates the thermal efficiency using the formula ηth = W/Q and displays the result.