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S3 PUT Request Cost Calculator

Cost S3 upload requests including the extra PUTs that multipart uploads generate for every part of every object.

About S3 PUT Request Cost Calculator

A multipart upload is not one request: every part is a separate PUT, and the create and complete calls are billed as well, so a 40 MB object at a 16 MB part size costs five requests rather than one. Choosing a larger part size cuts request count but raises the amount re-sent when a part fails. The per-1,000 rate above is a user-supplied list price to confirm on the AWS S3 pricing page for your region. Ingest pipelines that write millions of small objects or use an aggressively small part size can spend more on requests than on storage, and the fix is a part-size or batching change rather than a storage-class change.

Formula

S3 PUT Request Cost

requests per object = ceil(size ÷ part size) + 2 when multipart is used, otherwise 1; cost = requests ÷ 1000 x price per 1,000.

size
Average object size in MB
part size
Multipart part size in MB
+2
CreateMultipartUpload and CompleteMultipartUpload are billed as requests too

Worked example

With the default values below, S3 PUT Request Cost Calculator returns Monthly Request Cost of $50.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Objects uploaded per monthminimum 0 objects
2,000,000 objects
Average object sizeminimum 0 MB
40 MB
Multipart part sizeminimum 5 MB
16 MB
Size at which the client switches to multipartminimum 5 MB
16 MB
PUT, COPY, POST and LIST priceminimum 0 USD per 1,000 requests
0.005 USD per 1,000 requests

Results

Monthly Request Cost
$50.00
Billable Requests
10,000,000
Requests per Object
5
Extra Cost vs a Single PUT
$40.00
Upload Path
Multipart — 3 part uploads plus create and complete

Step by step

  1. 1Values used
  2. 2S3 PUT Request Cost
  3. 3Monthly Request Cost= 50.00
  4. 4Billable Requests= 10,000,000
  5. 5Requests per Object= 5
  6. 6Extra Cost vs a Single PUT= 40.00
  7. 7Upload Path= Multipart — 3 part uploads plus create and complete

Assumptions and limits

  • The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is S3 PUT Request Cost calculated?

requests per object = ceil(size ÷ part size) + 2 when multipart is used, otherwise 1; cost = requests ÷ 1000 x price per 1,000. A multipart upload is not one request: every part is a separate PUT, and the create and complete calls are billed as well, so a 40 MB object at a 16 MB part size costs five requests rather than one. Choosing a larger part size cuts request count but raises the amount re-sent when a part fails. The per-1,000 rate above is a user-supplied list price to confirm on the AWS S3 pricing page for your region.

Why does S3 PUT Request Cost matter?

Ingest pipelines that write millions of small objects or use an aggressively small part size can spend more on requests than on storage, and the fix is a part-size or batching change rather than a storage-class change.

What values do I need to enter?

This calculator takes 5 inputs: Objects uploaded per month, Average object size, Multipart part size, Size at which the client switches to multipart, PUT, COPY, POST and LIST price. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Do failed or abandoned multipart uploads still cost money?

Yes. Parts already uploaded were billed as requests and continue to be billed as storage until the upload is aborted, which is why an AbortIncompleteMultipartUpload lifecycle rule belongs on every bucket.

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