555 Astable Timing

How to use this tool

1. Enter the labeled inputs in the indicated units.
2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "ra": 1000,
  "rb": 1000,
  "c": 0.000001
}

Accuracy and scope

Standard two-resistor astable topology; ideal one-third/two-thirds thresholds and no discharge voltage offset. Simplified analytical model; not a design recommendation or safety certification.

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.