Amazon DynamoDB Pricing

Pay only for what you use. There is no minimum fee. Estimate your monthly bill using the Simple Monthly Calculator.

Free Tier*

As part of AWS’s Free Usage Tier, AWS customers can get started with Amazon DynamoDB for free. DynamoDB customers get 100 MB of free storage, as well as up to 5 writes/second and 10 reads/second of ongoing throughput capacity.

Provisioned Throughput Capacity

When you create or update your Amazon DynamoDB table, you specify how much capacity you wish to reserve for reads and writes. Amazon DynamoDB will reserve the necessary machine resources to meet your throughput needs with consistent, low-latency performance.

You pay a flat, hourly rate based on the capacity you reserve:

A unit of Write Capacity enables you to perform one write per second for items of up to 1KB in size. Similarly, a unit of Read Capacity enables you to perform one strongly consistent read per second (or two eventually consistent reads per second) of items of up to 1KB in size. Larger items will require more capacity. You can calculate the number of units of read and write capacity you need by estimating the number of reads or writes you need to do per second and multiplying by the size of your items (rounded up to the nearest KB).

Units of Capacity required for writes = Number of item writes per second x item size (rounded up to the nearest KB)

Units of Capacity required for reads¹ = Number of item reads per second x item size (rounded up to the nearest KB)

¹If you use eventually consistent reads you’ll get twice the throughput in terms of reads per second.

If your items are less than 1KB in size, then each unit of Read Capacity will give you 1 read/second of capacity and each unit of Write Capacity will give you 1 write/second of capacity. For example, if your items are 512 bytes and you need to read 100 items per second from your table, then you need to provision 100 units of Read Capacity.

If your items are larger than 1KB in size, then you should calculate the number of units of Read Capacity and Write Capacity that you need. For example, if your items are 1.5KB and you want to do 100 reads/second, then you would need to provision 100 (read per second) x 2 (1.5KB rounded up to the nearest whole number) = 200 units of Read Capacity.

Note that the required number of units of Read Capacity is determined by the number of items being read per second, not the number of API calls. For example, if you need to read 500 items per second from your table, and if your items are 1KB or less, then you need 500 units of Read Capacity. It doesn’t matter if you do 500 individual GetItem calls or 50 BatchGetItem calls that each return 10 items.

If your request throughput exceeds your provisioned capacity, it may be throttled. However, the AWS Management Console charts your provisioned and utilized throughput capacity, and lets you make changes easily in anticipation of traffic changes. To learn more about provisioned throughput and selecting the appropriate values, read our FAQ responses here.

To learn more about estimating how many capacity units you need for your table, you can read our documentation here.

Indexed Data Storage

Amazon DynamoDB is an indexed datastore, and the amount of disk space your data consumes will exceed the raw size of the data you have uploaded. Amazon DynamoDB measures the size of your billable data by adding up the raw byte size of the data you upload, plus a per-item storage overhead of 100 bytes to account for indexing. You do not need to “provision” storage with Amazon DynamoDB. You are simply billed for what you use, as described above.

Data Transfer**

Data transfer “in” and “out” refers to transfer into and out of Amazon DynamoDB. There is no additional charge for data transferred between Amazon DynamoDB and other Amazon Web Services within the same Region (i.e. $0.00 per GB). Data transferred across Regions (e.g. between Amazon DynamoDB in the US East (Northern Virginia) Region and Amazon EC2 in the EU (Ireland) Region), will be charged at Internet Data Transfer rates on both sides of the transfer.

* Your free usage is calculated each month and automatically applied to your bill – free usage does not accumulate.

** As part of AWS’s Free Usage Tier, AWS customers will receive free 15 GB of data transfer out each month aggregated across all AWS services for one year.

*** Data transfer out rate tiers aggregate outbound data transfer across Amazon EC2, Amazon S3, Amazon RDS, Amazon SimpleDB, Amazon DynamoDB, Amazon SQS, Amazon SNS, AWS Storage Gateway, and Amazon VPC.

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