Indicated Power Calculator


About Indicated Power Calculator (Formula)

An Indicated Power Calculator is a fundamental tool used in the field of internal combustion engines and thermodynamics to estimate the engine’s indicated power output, which represents the power generated by the engine’s pistons as they move within the cylinders. This calculation is crucial for understanding an engine’s performance, efficiency, and overall design. To calculate indicated power, several parameters and measurements are considered, and the formula is as follows:

Indicated Power (IP) = Average Effective Pressure (IMEP) × Engine Displacement (V) × Engine Speed (N) / 2,000,000


  • Indicated Power (IP) is the estimated power output of the engine in watts (W) or horsepower (HP).
  • Average Effective Pressure (IMEP) is the average pressure exerted on the engine’s pistons during the power stroke, typically measured in pascals (Pa) or pounds per square inch (psi).
  • Engine Displacement (V) is the total volume displaced by all the pistons in the engine’s cylinders during one complete cycle, measured in cubic centimeters (cc) or liters (L).
  • Engine Speed (N) represents the number of engine cycles or revolutions per minute (RPM).

To calculate the indicated power, you’ll need to obtain or calculate the average effective pressure based on pressure measurements within the engine cylinder during the power stroke. This pressure is a key parameter that reflects the engine’s efficiency in converting fuel into mechanical work.

The formula’s division by 2,000,000 is used to convert the power from units of pascals-cubic centimeters per minute (Pa-cc/min) to watts, which is the standard unit of power.

Indicated Power Calculators are essential tools for engine designers, automotive engineers, and researchers in the field of internal combustion engines. They provide insights into an engine’s performance and efficiency, helping engineers make informed decisions about engine design and optimization.

Indicated power is a valuable parameter used in conjunction with other measurements, such as brake power and friction power, to assess the overall efficiency and mechanical losses in an engine. Understanding the indicated power helps in improving fuel efficiency, reducing emissions, and optimizing the design of internal combustion engines for various applications, including automotive, marine, and industrial engines.