All measurements are of the floor to the top of the head and when the figure is standing in the pictured pose (the bottom of the text is the "line"). Assume a slight margin of measuring error.
Regular Kreons 1.75in - to give an idea of comparison
Regular Combiners - Devastator/Superion/other combiners 4.4in
Devastator 2.0 5.0in
Metroplex/Fort Max/Scorponok 6.3in
Monstructor/LioKaiser/Road Caesar/Landcross/Dinoking - 4.4in
Omega Supreme/Omega Sentinel 4.8in
Optimus Prime Cab,Trailer 2.5 in long, 1 inch high
Quintesson Judge/Prosecutor 1.75in Raindance 1in
Ravage, Steeljaw, Ramhorn 1.3in
Sharkticon - Almost 2 inches tall to the top of the spike when mouth is closed
Sky Lynx (Combined mode) 4.5in
Trypticon 6.0in - Trypticon can stand tall or lean forward. It depends on how you position the legs and tail.
Ultra Magnus (robot) 2.1in
Ultra Magnus Cab,Trailer 2.5 in long, 1.1 inch high