It often creates confusion for common men to understand which rank is equal to which of the other force.. here is the guide..

PAKISTAN NAVY RANKS

01. MIDSHIPMAN
02. SUB LIEUTENANT (S/Lt)
03. LIEUTENANT (Lt)
04. LIEUTENANT COMMANDER (Lt Cdr)
05. COMMANDER (Cdr)
06. CAPTAIN (Capt)
07. COMMODORE (Cdre)
08. REAR ADMIRAL (RAdm)
09. VICE ADMIRAL (VAdm)
10. ADMIRAL (Adm)

PAKISTAN ARMY
EQUIVALENT RANKS

01. 2ND LIEUTENANT
02. LIEUTENANT
03. CAPTAIN
04. MAJOR
05. LIEUTENANT COLONEL
06. COLONEL
07. BRIGADIER
08. MAJOR GENERAL
09. LIEUTENANT GENERAL
10. GENERAL

PAKISTAN AIR FORCE
EQUIVALENT RANKS

01. PILOT OFFICER
02. FLYING OFFICER
03. FLIGHT LIEUTENANT
04. SQUADRON LEADER
05. WING COMMANDER
06. GROUP CAPTAIN
07. AIR COMMODORE
08. AIR VICE MARSHAL
09. AIR MARSHAL
10. AIR CHIEF MARSHAL

Source
http://www.paknavy.gov.pk/ranks.html