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

As of the 28th July 2015 you can get this information via CloudWatch.

aws cloudwatch get-metric-statistics --namespace AWS/S3 --start-time 2015-07-15T10:00:00 
--end-time 2015-07-31T01:00:00 --period 86400 --statistics Average --region us-east-1 
--metric-name BucketSizeBytes --dimensions Name=BucketName,Value=myBucketNameGoesHere 
Name=StorageType,Value=StandardStorage


Important: You must specify both StorageType and BucketName in the dimensions argument otherwise you will get no results.