There are quite a few utilities:
- ncdu
sudo apt install ncdu
ncdu

2. gdu
It’s much faster than ncdu especially for SSDs. It scanned a 1TB SSD in 7 seconds.
curl -L https://github.com/dundee/gdu/releases/latest/download/gdu_linux_amd64.tgz | tar xz
chmod +x gdu_linux_amd64
sudo mv gdu_linux_amd64 /usr/bin/gdu
gdu

3. dua – Disk Usage analyzer
This also claims to be fast for SSDs. It starts the interface even before sundirectories are scanned, so that makes it even faster than gdu
curl -LSfs https://raw.githubusercontent.com/byron/dua-cli/master/ci/install.sh | sh -s -- --git byron/dua-cli --target x86_64-unknown-linux-musl --crate dua
sudo ln -s ~/.cargo/bin/dua /usr/bin/dua
dua

Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
He is a full stack developer, whose favorite languages are currently Python and Vue.js. He is also fluent in Javascript, Flutter/Dart, Perl, PHP, SQL, C and bash shell scripting. He loves Linux, and can often be found tinkering with linux kernel code, and source code for GNU applications. He used to be an active developer on XDA forums, and his tinkered ROMS used to be very popular in the early 2000s.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.