DynamoDB Item Size and Consumed Capacity Calculator

This tool takes the JSON representation of a DynamoDB item and tells you its size in bytes and how many capacity units it'll consume when reading and writing.

To use the tool, paste an item's DynamoDB JSON into the text area below and click Calculate. This is a client-side tool, so your data stays in the browser.

If you're using the old DynamoDB console, you can get the DynamoDB JSON of an item by clicking the item's key, switching to Text view, and ensuring DynamoDB JSON is checked.

If you're using the new DynamoDB console, you can get the DynamoDB JSON of an item by clicking the item's key, switching to JSON view, and ensuring View DynamoDB JSON is toggled on.

To learn more about this topic, you can read my blog post on Medium.