Boost Horsepower Calculator

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Calculates the estimated horsepower gain from adding a supercharger to a naturally aspirated engine, based on boost pressure and engine displacement.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Engine Displacement (cubic inches), Boost Pressure (psi), and Horsepower per PSI (Estimate) in the units shown.

Step 2

Read Estimated Horsepower Gain (hp) and Total Horsepower (hp) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Engine Displacement (cubic inches): 200; Boost Pressure (psi): 5; Horsepower per PSI (Estimate): 8

Estimated Horsepower Gain (hp): 40 hp; Total Horsepower (hp): 60 hp

Engine Displacement (cubic inches): 300; Boost Pressure (psi): 7; Horsepower per PSI (Estimate): 10

Estimated Horsepower Gain (hp): 70 hp; Total Horsepower (hp): 100 hp

Engine Displacement (cubic inches): 400; Boost Pressure (psi): 10; Horsepower per PSI (Estimate): 12

Estimated Horsepower Gain (hp): 120 hp; Total Horsepower (hp): 160 hp

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