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free memory = buff/cache + available memory?

User_U1UYAFeb 17 2021

Hi everybody,
It's under my impression that free memory is just by looking at available memory. I am wondering it is not correct. seems like free memory calculation = available memory + buff/cache.
What is the formula to calculate free memory?
free -h
total used free shared buff/cache available
Mem: 15G 4.9G 596M 8.6G 10G 914M <-- available is 914M and buff/cache is 10G
Swap: 8.0G 978M 7.0G
Please shed some light on this issue.
Appreciated

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Added on Feb 17 2021
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