S3Express FAQ and Knowledge Base

To calculate the total size of all objects contained in a S3 bucket, use the following command:

ls my_bucket_name -s -sum

where:
my_bucket_name is the name of your bucket
-s is used to include all subfolders (e.g. recursive)
-sum is used to show just a summary without listing all objects.

The output will be similar to the following:

Bucket: my_bucket_name
5417 Files (10.74GB = 11533607629B)