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> Besides, nobody is calculating this, they are measuring and that is just a matter of what label you put on the dial.

That's why I asked about engineering, not driving. Nobody converts torque to power etc.?

Torque to power is just (torque * RPM) / (some constant depending on the units inolved). With ft-lbs and horsepower, that constant is 5252; with N-m and kW, it's 9549. The only thing that changes is the constant.

No, power is just torque times angular velocity. No constants involved.

If you ignore units, sure.

You make it sound like you'd have to remember a 4-digit constant in either case. That's stupid, it's simply (torque * RPS * 2 * PI).

The engineers who do that are using metric. Marketing might do this conversion, but they just plug it into a converter and have no reason to know anything more than bigger is better.

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