How does torque relate to horsepower in lawnmower engines?

Question:We want to buy a gas push lawnmower with at least 3 horsepower, but everything seems to be in torque now. So how do I know what the horsepower is?

Answers:
They are somewhat related. They are both units of power. Torque is rated at defined RPMs while HP is not. The reason torque is a better measurement for small engines is because while an engine might be rated for a high HP if it does not have low end torque (at low RPM) the HP at the high end does little good.

All of that being said you need to know RPM to convert torque to HP. If you do know the RPM the conversion is

HP=torque(in pound inches)*RPM/63025 or
HP=torque(in pound feet)*RPM/5252