How do I find the total size of my AWS S3 storage bucket or folder?

Question

Does Amazon provide an easy way to see how much storage my S3 bucket or folder is using? This is so I can calculate my costs, etc.

Answer 1

I use s3cmd du s3://BUCKET/ --human-readable to view size of folders in S3. It gives quite a detailed info about the total objects in the bucket and its size in a very readable form.