US Digital Encoder Distance/sec to Rpm

[Lemons]

Ok so this is the first year we have really decided to implement digital encoders on motors. We hooked them up fine and using the example code in LabVIEW were able to get readings. The only question we have is what unit (distance/second) is the encoder reading in and is it possible to change that unit (distance/second) to an RPM reading if its not already set as such? We are using US Digital E4P Quadrature encoders. Thanks