In order to know the available free disk space on your Mac device (Macbook, iMac, or Mac Mini) running macOS you can make use of the Terminal command df -h command,
Example:% df -h
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/disk3s3s1 228Gi 14Gi 115Gi 11% 501138 1208959160 0% /
devfs 200Ki 200Ki 0Bi 100% 692 0 100% /dev
/dev/disk3s6 228Gi 20Ki 115Gi 1% 0 1208959160 0% /System/Volumes/VM
/dev/disk3s4 228Gi 475Mi 115Gi 1% 1941 1208959160 0% /System/Volumes/Preboot
/dev/disk3s2 228Gi 64Mi 115Gi 1% 49 1208959160 0% /System/Volumes/Update
/dev/disk1s2 500Mi 6.0Mi 482Mi 2% 7 4930560 0% /System/Volumes/xarts
/dev/disk1s1 500Mi 7.3Mi 482Mi 2% 33 4930560 0% /System/Volumes/iSCPreboot
/dev/disk1s3 500Mi 412Ki 482Mi 1% 38 4930560 0% /System/Volumes/Hardware
/dev/disk3s1 228Gi 97Gi 115Gi 46% 1142503 1208959160 0% /System/Volumes/Data
map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /System/Volumes/Data/home
-h gives you results in human-readable format Gi/Mi
As you can see my disk on the Mac disk3s1 is taking up 46% space i.e. 97 GB utilized of 228 GB, so I have 131 GB of free space.

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