Made by Zac Charles
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.
You can get the DynamoDB JSON of an item using the AWS console by clicking the item's key, switching to Text view, and ensuring DynamoDB JSON is checked.
To learn more about this topic, you can read my blog post on Medium.