There are quite a few utilities:

  1. 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