The below table depicts PDH,CEU and LU Conversions

1.0 CEU (Continuing Education Unit) 10 PDHs or 10 LUs.
1.0 PDH (Professional Development Hour) 1.0 Clock Hour (minimum 50 minutes).
1.0 LU (Learning Unit) for architects 1.0 PDH for engineers.

This table displays the PDH units for various activities.

One college semester hour 45 PDH
One college quarter hour 30 PDH
One continuing education unit (CEU) 10 PDH
One contact hour of teaching for the first time 2 PDH
Each published paper, article or book 10 PDH
Each patent 10 PDH