How do you determine horsepower of a motor if the motor tag is gone?

There are a lot of older elevators out there with motor data tags that have been painted over or are missing all together. As a guide use the following formula, HP =’s Capacity x Speed / Velocity (33,000). Create a spread sheet and plug-in the numbers. Remember to round-up on HP instead of down and when replacing a motor always go with the same RPM or as close as possible to the original. Tach it if you are not sure how many RPM’s you’ve got.

Devices to help you with information if you don’t have it.
Car Speed Measurement Device
Motor Tachometer 

Or do a Google search for either and you should be set.