The history of horsepower - and why it doesn't work as a metric

The history of horsepower highlights how the widely used power metric was conceived more as an industrial sales concept than a direct measure of what an engine does in motion. The article says Scottish engineer James Watt helped formalize the term, but it was not fully an invention of his own, and that horsepower is ultimately an idea expressed through mathematics. It argues horsepower was misapplied to cars because it compares output to the work a brewery draft horse could perform in the late 18th century. The piece explains the original purpose: to help miners evaluate how steam engines would move coal from mines efficiently. It also claims Watt’s calculations were based on an average horse sustained over a full working day, leading to a modern mismatch when translating into vehicle performance. It adds that today horsepower often remains the selling figure despite its disputed basis.