On the low end, you can set up Kali Linux as a basic Secure Shell (SSH) server with no desktop, using as little as 128 MB of RAM (512 MB recommended) and 2 GB of disk space.

Is 50gb enough for Kali Linux?

It certainly wouldn’t hurt to have more. The Kali Linux installation guide says it requires 10 GB. If you install every Kali Linux package, it would take an extra 15 GB. It looks like 25 GB is a reasonable amount for the system, plus a bit for personal files, so you might go for 30 or 40 GB.

How big should my Kali partition be?

Once GParted has opened, select your Linux partition ( /dev/sda1 ) & resize it leaving enough space (we recommend at least 20 GB) for the Kali Linux installation.