I’m beginner. How can I change the blender units to meter, inch, etc ? I need to scale my object to real size.
In properties window, Select Scene >> Units and adjust to your liking.
Thanks. You really help. I’ve searched the setting in User Properties and … surely got nothing… 
Thank you very much…!
And just in case you don’t know, in the Properties Panel “n”, you can also have the edges labeled with the measurments (Numerics>Edge Length). Don’t forget that it’s important also to set the scale of your object after you scaled it. with CTRL+A and select Apply “Scale”. 