Erlang B Calculator

Size voice trunks or SIP channels from offered traffic and a target blocking probability.

Privacy: All calculations run in your browser. Nothing you type or upload is transmitted.

What this tool does

Free Erlang B calculator. Enter traffic in Erlangs and your blocking target; get the exact number of trunks required. Runs entirely in your browser.

How to use

1. Fill the inputs or paste your data.

2. Click the calculate/decode/audit button.

3. Review the KPIs, charts, and callouts.

4. Use the related-tools strip at the bottom for the next step in your workflow.

Notes

• This tool is for estimation and exploration, not legal or regulatory certification.
• Report issues or request features via the feedback tab on the right edge of the page.