The Erlang C probability that an arriving call must wait, for E erlangs on m agents, is (E^m/m!)(m/(m-E)) divided by [the sum of E^i/i! for i from 0 to m-1, plus (E^m/m!)(m/(m-E))].
field report · Checked 2026-09-25
- Vendor
- vendor-neutral
- Product
- not restricted
- Subsystem
- agent staffing
- Deployment
- any
- Region
- not restricted
- Release range
- revision current at 2026-09-25
- Status
- field report
- Checked
- 2026-09-25
Sources
- Erlang (unit) — Wikipedia · tier 5 independent technical research · Erlang C formula section
Cite this note
APA
WarmTransfer. (2026, September 25). Erlang B and Erlang C for voice and contact center sizing: source note erlang-traffic-engineering-erlang-c-formula. WarmTransfer. https://warmtransfer.net/knowledge/claims/erlang-traffic-engineering-erlang-c-formula
BibTeX
@misc{warmtransfer-claim-erlang-traffic-engineering-erlang-c-formula,
title = {Erlang B and Erlang C for voice and contact center sizing: source note erlang-traffic-engineering-erlang-c-formula},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/erlang-traffic-engineering-erlang-c-formula},
note = {Source note erlang-traffic-engineering-erlang-c-formula, checked 2026-09-25}
}