How do I Identify data transfer costs in Amazon S3?

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I incurred high data transfer charges for Amazon Simple Storage Service (Amazon S3). I want to identify the buckets that caused the high data transfer charges.

Short description

You pay for all the bandwidth into and out of Amazon S3, except for the following:

  • Data that's transferred out to the internet for the first 100 GB per month
    Note: This is aggregated across all AWS services and Regions except Amazon Web Services in China and AWS GovCloud (US).
  • Data that's transferred in from the internet
  • Data that's transferred between S3 buckets in the same AWS Region
  • Data that's transferred from an Amazon S3 bucket to any service within the same Region as the S3 bucket
    Note: This includes data that's transferred to a different account in the same Region.
  • Data that's transferred out to Amazon CloudFront


1.    To identify the buckets that are responsible for high data transfer, check your S3 usage report. The report helps you to review the operation, Region, and time when the data transfer occurred.

2.    To identify the usage types that correspond to data transfer, see Understanding your AWS billing and usage reports for Amazon S3.

3.    Review the S3 server access logs that are associated with the buckets that are responsible for high data transfer charges. This helps you to view detailed information about the requests. You can query the server access logs using Amazon Athena to get information on a specific date and time, operations, and requesters. For example, run the following query to see the amount of data that was transferred through a certain IP address during a specific time period:

SELECT SUM(bytessent) as uploadtotal,SUM(objectsize) as downloadtotal,SUM(bytessent + objectsize) AS total FROM s3_access_logs_db.mybucket_logsWHERE remoteIP='' AND parse_datetime(requestdatetime,'dd/MMM/yyyy:HH:mm:ss Z')BETWEEN parse_datetime('2021-07-01','yyyy-MM-dd')AND parse_datetime('2021-08-01','yyyy-MM-dd');

For more information, see How do I analyze my Amazon S3 server access logs using Athena?

Related information

Understanding data transfer charges

Amazon S3 request metrics in CloudWatch

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