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Do you know how much horsepower your car has? Is it from a dyno or from a manufacturer's page? If it's from a dyno, it's most likely wheel horsepower, but if it's from the manufacturer, it's almost garunteed that it's flywheel horsepower. These two are very different, and in racing, wheel horsepower (also known as break horse power, bhp) is what really matters. Use the forms below to convert back and forth between the two. Note: Conversions are approximate and depend highly on the car's gearing, drivetrain, etc.