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THE FEUTEX TOOLKIT

DynamoDB Item Capacity Units

Estimate strongly consistent reads and standard writes with per-item rounding.

Computer Systems workspace● Runs in your browser
01 Your input
02 Your result
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FormulaStrongly consistent read capacity = Math.ceil(bytes/4096)*r; Standard write capacity = Math.ceil(bytes/1024)*w
Sources and model references

Made for real tasks

  • Estimate strongly consistent reads and standard writes with per-item rounding.
Explore step-by-step workflows →

Worked example

Inputs

Item size
5000 bytes
Reads per second
100 reads/s
Writes per second
40 writes/s

Expected results

Strongly consistent read capacity
200 RCU
Standard write capacity
200 WCU

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter item size, reads per second, writes per second in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "bytes": 5000,
  "r": 100,
  "w": 40
}

Accuracy and scope

One same-size item per operation; excludes transactions, indexes, batch filtering and throttling.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.