Inconsistency in reporting memory

[manmath]

Dear members,
I'm running Kubuntu on a decade old system. Luckily it runs quite well, as I desired. However the problem is three different tools show memory usage quite differently. I'm confused regarding the actually memory usage, and the difference between them is quite huge.
1. Neofetch reports: 414 mb
2. Free reports: 315 mb
3. Stacer reports: 879.6 mb
Would somebody please explain me why this inconsistency, or if I'm not reading it right? Have a look at the screenshot too.


Also suggest if my setup is consuming more memory than expected.

[claydoh]

Each and every single monitor is calculating things a bit differently, some include caches and/or buffers as 'used'.

The ubiquitous linuxatemyram website has more information that may be helpful.

[manmath]

Thanks for the info.