Why does the calculated width and height in pixel of a string in Tkinter differ between platforms?

Why does the calculated width and height in pixel of a string in Tkinter differ between platforms?

python fonts cross-platform size tkinter

tkinter

Python Tkinter: Attempt to get widget size

python python-3.x geometry size tkinter

tkinter

Python Tkinter: OptionMenu modify dropdown list width

python tkinter size optionmenu

tkinter

Can't change button font size in tkinter

python-3.x user-interface tkinter fonts size

tkinter

How to set font size of Entry in Tkinter

python tkinter fonts size tkinter-entry

tkinter

How to prevent Tkinter labelframe size changes when an empty label is inserted

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tkinter

Python 3.4 Tkinter - not able to give a size to frames in PanedWindow

python-3.x tkinter size

tkinter

Python tkinter. How to get height of Menu

python menu tkinter height size

tkinter

Tkinter Text widget - how to find out number of rows and columns?

python text tkinter size

tkinter

Get tkinter widget size in pixels

python tkinter size pixels

tkinter

Performing arithmetic on floating point values of different sizes

python tkinter floating-point size tkinter-entry

tkinter

Tkinter strange Frame Size

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tkinter

How to increase the font size of Tab header in tkinter Notebook? [duplicate]

python tkinter fonts header size

tkinter

Resize buttons of a Spinbox

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tkinter

The frames' size automatically adjusts to widgets' size although propagate is set to false(0) in tkinter

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tkinter