Orc is 7 ft tall male (2.1 meter) and 6.5 female (1.9 meter)
Human are average between 5 and 6 ft tall (1.5 to 1.8 meter) and female are smaller (but no details), obvious even female orc is taller than male human
To give u idea of Taurens, male tauren get to 9 ft tall (2.75 meter) and around 800 pound (360 kgs)
Ogre get to 7 ft tall (2.1 meter) but on weight it is mentioned they keep gain weight non stop
Wow has always balanced orcs vs humans as orcs far stronger but less disciplined, hence how a human can stand vs orc despite orc ability to smash the human shield in 1 blow (shown in many old fights before)