Find all directories (type d) in the current directory (indicated by ~) and all of its subdirectories (mindepth 1) and print their sizes (du -hsc) in a human-readable format (h) including a total (s) at the end (c) and separate the output with a null character (print0) so that it can be used as input for xargs (xargs -0).
find ~ -mindepth 1 -type d -print0 | xargs -0 du -hsc