Calculating Data Transfer Costs for Downloading Files from an S3 Bucket

Hi,

Yes, your calculation is correct for data transfer out of the AWS Cloud. To be fully complete, you'd have to add the costs of API calls charged at $0.01 per 1'000 request. See https://aws.amazon.com/s3/pricing/

On data transfer, see this example at https://aws.amazon.com/s3/faqs/#Billing

Data Transfer Out Example:
Assume you transfer 1 TB of data out of Amazon S3 from the US East (Northern Virginia) 
Region to the internet every day for a given 31-day month. Assume you also transfer 1 TB 
of data out of an Amazon EC2 instance from the same Region to the internet over the same 
31-day month.

Your aggregate Data Transfer would be 62 TB (31 TB from Amazon S3 and 31 TB from 
Amazon EC2). This equates to 63,488 GB (62 TB * 1024 GB/TB).

This usage volume crosses three different volume tiers. The monthly Data Transfer Out 
charge is calculated below assuming the Data Transfer occurs in the US East (Northern 
Virginia) Region:
10 TB Tier: 10,239 GB (10×1024 GB/TB – 1 (free)) x $0.09 = $921.51
10 TB to 50 TB Tier: 40,960 GB (40×1024) x $0.085 = $3,481.60
50 TB to 150 TB Tier: 12,288 GB (remainder) x $0.070 = $860.16

Total Data Transfer Out charge = $921.51+ $3,481.60 + $860.16= $5,263.27

Best,

Didier