For example, an entry-level Toyota iQ has a 68bhp engine, while a supercharged Jaguar XF packs 503bhp. Powerful engines have a higher bhp figure. Unlike ‘horsepower’, which refers to an engine’s total output, brake horsepower only looks at the amount of energy left once other parts such as the gearbox, alternator and water pump have all been powered. It's measured at the road wheels, not at the flywheel. What is bhp?īrake horsepower – or bhp – is the most widely used measure of engine power alongside PS (see below), although it's often not clear which unit manufacturers are using in their brochures. This handy calculator lets you convert quickly and easily between the three main measurements used – bhp, kW and PS. Carmakers sometimes quote the power outputs of their engines using different units, which can be confusing when you're trying to compare new cars.
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