Engine Horsepower ($EHP$):

$$EHP = \frac{BHP}{\xi_m}$$

Where:

• $EHP$ is the engine horsepower, in horsepower (hp).
• $BHP$ is the pump brake horsepower, in horsepower (hp).
• $\xi_m$ is the engine efficiency, in decimal form (0.80 for diesel, 0.70 for gasoline).