MeasureIt - Measurement tools add-on
Why Blender Stack Exchange recommends it
Blender Stack Exchange answerers point people to it when someone needs to display or read exact dimensions of a model and wants a walkthrough of the MeasureIt add-on.
Recommended by 3 people across 3 different months, 2017 to 2019.
What it is
A short screencast by the add-on's author showing MeasureIt, a Blender add-on that draws measurements in the viewport. It covers vertex-to-vertex lengths, vertex labels, object-to-object distances, scale handling, and metric and imperial units.
What people said
Recommends sambler · 2017-10 · Blender Stack Exchange · on “How to make 3d text values larger in 3d view?”
While it may not be as simple to use, you can enable the MeasureIt addon [LINK] which can add measurements at any font size you want. The MeasureIt addon was added to blender 2.78, it should be possible to manually install it in earlier versions. [LINK] By setting the text size in the MeasureIt Configuration, all items selected when segment is clicked will be given the same font size. Individual measurement display options can be adjusted in the properties region. Be sure to enable the display by clicking the Show/Hide button at the top. You can find a video tutorial on using the MeasureIt addon here [this video] .
Recommends Lauloque · 2018-12 · Blender Stack Exchange · on “How do I get dimensions for an object?”
As others mentioned, you can have the object's dimensions in the side bar. But understand it's only the objects panel from a bounding box. In your case, the dimensions are calculated from a box kind of like this : [LINK] If you want more precise measurements, ex something like that: [LINK] You can use the MeasureIt addon [this video] . AFAIK it's included in Blender.
Recommends Los · 2019-12 · Blender Stack Exchange · on “how to display overall dimensions for furniture”
Looks like there is an addon called "MeasureIt Tools" that comes built in to Blender, you just need to enable it in the add-ons section of the preferences. Check this video out. [this video] Los